What's 'best-practice' with external hard drives?

Hello folks,
I just got myself a 500GB LaCie d2 'Quadra' hard drive, and it works great - just as I was led to expect. Now I've connected it to my iMac with a FW400 cable. I've a few questions regarding general usage and 'best practice' when using an external hard drive like this:
1. Do I need to disconnect it (pull out the cable from my iMac) every time I Shutdown - and reconnect on Startup? Or can I leave it it and pretty much just forget about it?
2. Can I turn it 'on' and 'off' any number of times (using the on/off switch on the back) when working on the iMac? I might like to switch it off if I'm not using it for an extended period of time while still working on the computer. Is this okay?
3. When I'm not using the drive and the drive switch is 'off', can the drive still remain connected to 'mains' power? Or is it necessary to disconnect it from the 'mains' entirely?
4. I understand it's best to disconnect when 'Repairing Permissions?' Can this be confirmed?
Thanks so much.
Cheers!
Steve.

1. Do I need to disconnect it (pull out the cable from my iMac) every time I Shutdown - and reconnect on Startup? Or can I leave it it and pretty much just forget about it?
What I do is shut down my Mac, leaving it connected to the mains: the external HD, external speakers and other peripherals are all connected to a mains switch and I turn these off. There's no need to disconnect the cable: some disks spin down when the computer is shut down, some don't. It probably wouldn't hurt to leave it spinning anyway, though I prefer to shut it off at the mains. Incidentally I shouldn't disconnect the computer from the mains when you shut down: doing this will run down the PRAM battery and hasten the day it needs replacing, which is expensive.
2. Can I turn it 'on' and 'off' any number of times (using the on/off switch on the back) when working on the iMac? I might like to switch it off if I'm not using it for an extended period of time while still working on the computer. Is this okay?
I shouldn't do this: the most strain on a hard disk is when it is starting up, not when it is running: I should leave it running all the time the Mac is on. If you do switch it off, make sure to unmount it first (drag it to the trash) otherwise you will have all sorts of problems.
3. When I'm not using the drive and the drive switch is 'off', can the drive still remain connected to 'mains' power? Or is it necessary to disconnect it from the 'mains' entirely?
No: I see no problem in leaving it plugged in to the mains: the 'off' switch disconnects it anyway.
4. I understand it's best to disconnect when 'Repairing Permissions?' Can this be confirmed?
I've never heard this, and I can't see that there's any neccesity: the repairing process will be confined to the disk you have nominated to work on in any case.

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I hope this is the right forum for this one - please give me a steer if not! I've also posted it in 'Dock and Finder', but this forum seems equally appropriate, if not more so.
I'm getting repeated issues with External Hard Drives, including ones that I have been using successfully for months/years, suddenly failing to mount and then becoming 'unknown device' through the firewire branch of 'About This Mac'.
I've just bought a new hard drive on the grounds that the others had somehow failed, and the same problems are emerging. I decided to Repair Permissions on my iMac's internal drive, and am copying the results below, from repair runs conducted yesterday and today:
YESTERDAY'S REPAIR PERMISSIONS RESULTS
Verifying volume “Macintosh HD”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
The volume Macintosh HD appears to be OK.
Repairing permissions for “Macintosh HD”
Reading permissions database.
Reading the permissions database can take several minutes.
Permissions differ on "private/var/log/secure.log", should be -rw------- , they are -rw-r----- .
Permissions differ on "Library/Preferences", should be drwxrwxr-x , they are drwxrwxrwx .
Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/lanArrow.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/lanCheck.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/lanDisabled.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/wanArrow.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/wanCheck.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
Permissions differ on "Applications/Utilities/AirPort Utility.app/Contents/Resources/wanDisabled.png", should be -rwxrwxr-x , they are -rw-rw-r-- .
Permissions differ on "Library/Application Support/Apple/ParentalControls/ALRHelperJobs", should be drwxrwxr-x , they are drwxr-xr-x .
ACL found but not expected on "System/Library/User Template/English.lproj/Sites".
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/DVD.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSettings.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSources.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Movies.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Music.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Photos.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Podcasts.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/TV.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/BackRow.framework/Versions/A/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
ACL found but not expected on "System/Library/User Template/English.lproj/Desktop".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Application Support".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Assistants".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/MIDI Drivers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/Components".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/Digidesign".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/VST".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds/Alerts".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds/Banks".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/ColorPickers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Compositions".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Favorites".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/FontCollections".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Fonts".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie/Plug-ins".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie/Sound Effects".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Input Methods".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Internet Plug-Ins".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Keyboard Layouts".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Preferences".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Printers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Screen Savers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Sounds".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Voices".
ACL found but not expected on "System/Library/User Template/English.lproj/Library".
ACL found but not expected on "System/Library/User Template/English.lproj/Movies".
ACL found but not expected on "System/Library/User Template/English.lproj/Music".
ACL found but not expected on "System/Library/User Template/English.lproj/Pictures".
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Warning: SUID file "System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/Resources /DiskManagementTool" has been modified and will not be repaired.
Warning: SUID file "sbin/umount" has been modified and will not be repaired.
Warning: SUID file "bin/rcp" has been modified and will not be repaired.
Permissions differ on "Library/Application Support/Apple/ParentalControls/ContentFiltering", should be drwxrwxr-x , they are drwxr-xr-x .
Permissions differ on "Library/Application Support/Apple/ParentalControls", should be drwxrwxr-x , they are drwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iLifeMediaBrowser.framework/Versions/A/CodeRe sources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/CodeResourc es", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/BlackAndWhiteEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/CubeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DissolveTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DropletTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FadeThroughBlackTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransitionSmall.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PageFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PushTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/RevealTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/SepiaEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/TwirlTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/WipeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrwxr-xr-x .
Warning: SUID file "usr/bin/quota" has been modified and will not be repaired.
Warning: SUID file "usr/bin/rlogin" has been modified and will not be repaired.
Warning: SUID file "usr/bin/rsh" has been modified and will not be repaired.
Permissions repair complete
TODAY'S PERMISSIONS REPAIR RESULTS
Repairing permissions for “Macintosh HD”
Reading permissions database.
Reading the permissions database can take several minutes.
Permissions differ on "Library/Application Support/Apple/ParentalControls/ALRHelperJobs", should be drwxrwxr-x , they are drwxr-xr-x .
ACL found but not expected on "System/Library/User Template/English.lproj/Sites".
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/DVD.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSettings.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSources.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Movies.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Music.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Photos.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Podcasts.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/TV.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/BackRow.framework/Versions/A/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
ACL found but not expected on "System/Library/User Template/English.lproj/Desktop".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Application Support".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Assistants".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/MIDI Drivers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/Components".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/Digidesign".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins/VST".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Plug-Ins".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds/Alerts".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds/Banks".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio/Sounds".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Audio".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/ColorPickers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Compositions".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Favorites".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/FontCollections".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Fonts".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie/Plug-ins".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie/Sound Effects".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/iMovie".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Input Methods".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Internet Plug-Ins".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Keyboard Layouts".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Preferences".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Printers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Screen Savers".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Sounds".
ACL found but not expected on "System/Library/User Template/English.lproj/Library/Voices".
ACL found but not expected on "System/Library/User Template/English.lproj/Library".
ACL found but not expected on "System/Library/User Template/English.lproj/Movies".
ACL found but not expected on "System/Library/User Template/English.lproj/Music".
ACL found but not expected on "System/Library/User Template/English.lproj/Pictures".
ACL found but not expected on "System/Library/User Template/English.lproj/Public".
Permissions differ on "Applications/iTunes.app/Contents/CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
Permissions differ on "Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents/ CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
Permissions differ on "Applications/iTunes.app/Contents/Resources/iTunesHelper.app/Contents/CodeResou rces", should be -rw-rw-r-- , they are lrw-rw-r-- .
Warning: SUID file "System/Library/Filesystems/AppleShare/afpLoad" has been modified and will not be repaired.
Warning: SUID file "System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/Resources /DiskManagementTool" has been modified and will not be repaired.
Warning: SUID file "sbin/umount" has been modified and will not be repaired.
Warning: SUID file "bin/rcp" has been modified and will not be repaired.
Permissions differ on "Library/Application Support/Apple/ParentalControls/ContentFiltering", should be drwxrwxr-x , they are drwxr-xr-x .
Permissions differ on "Library/Application Support/Apple/ParentalControls", should be drwxrwxr-x , they are drwxr-xr-x .
Permissions differ on "System/Library/PrivateFrameworks/iLifeMediaBrowser.framework/Versions/A/CodeRe sources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/CodeResourc es", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/BlackAndWhiteEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/CubeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DissolveTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DropletTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FadeThroughBlackTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransitionSmall.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PageFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PushTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/RevealTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/SepiaEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/TwirlTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/WipeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Warning: SUID file "usr/bin/quota" has been modified and will not be repaired.
Warning: SUID file "usr/bin/rlogin" has been modified and will not be repaired.
Warning: SUID file "usr/bin/rsh" has been modified and will not be repaired.
Permissions repair complete
My concerns are:
* Some of the permissions repaired yesterday appear to have needed to be repaired again today
* There are several files which carry a warning that they won't be repaired as they have been 'modified', and some of these clearly relate to disk management.
Does anyone have any ideas what is going on???
Thanks!!

Many problems with the 10.5.7 update have been fixed by a Restart.
If that doesn't help, something may have gone wrong with the update. Download and install the "combo" update, from: http://support.apple.com/downloads/MacOS_X_10_5_7_ComboUpdate
If that doesn't help, try running the Apple Hardware Test, on the disc that came with your computer.
1. Disconnect all external devices (including the Ethernet cable) except the keyboard and mouse.
2. Insert the "Additional Software & Apple Hardware Test" disc that came with your computer.
3. Restart while holding down the "C" key. When the list of available startup volumes appears, click Apple Hardware Test and the right arrow.
4. When the Apple Hardware Test main screen comes up (after a moment), follow the on screen instructions.
5. If it detects a problem, an error code will be displayed. Make a note of it.

I/O timeout all the time on console - what can I do with my hard drive? Macbook pro late 2011

My macbook has been extremely slow for a while and after looking on this site I discovered I should look at the console - and noticed I had I/O timeouts all the time which I gather are a problem.
What can I do with my hard drive? If I back it up using time machine and erase the disk with zeros will the problem continue if I simply restore from time machine?
Or should I invest in a new hard drive - but if I buy a new hard drive is there something on my computer that will wreck that one as well? i use final cut pro/studio a lot and it's got to the stage where I can barely use it - do I need a 7200rpm hard drive? My current one is a 500gb 5400rpm.
I have 16gb of RAM in but since upgrading this from 4GB it made a difference to the speed for all of two seconds then the computer returned to its normal slow speed.
Would appreciate any help on this issue as I'm not particularly technical.

I wouldn't worry too much about what the Console logs are showing... although I/O timeouts, if related to reading/writing to your disk may be a problem. I would have to see the whole Console message to know for certain...
Your hard drive is sure to be slowing you down with FCP. Your best bet would be to upgrade to an SSD, if you can afford it. It's the only way you're going to see a real speed increase in FCP as so many large temp/cache files are written to the drive.
If you can't afford a SSD, you may want to look at a 7200rpm SATA III drive (if your MBP supports SATA III - which model do you have? 2011 or later, I'm assuming, since you note that you've 16GB of RAM?).
You should also update your OS to 10.7.5 if your profile reading of 10.7.2 is correct. Won't help speed, but will be more reliable -> http://support.apple.com/kb/DL1582.
Clinton

HT2729 Digital Copies to my IMac with external hard drive, then on my MacBook Pro I can see the movies, but if I close out my IMac, I can't access my movies on my laptop??? Can anyone help me out here? Thanks.

I have my itunes stored on my external hard drive of my IMac.
I have started to put my Digital Copies to my IMac with external hard drive, then on my MacBook Pro I can see the movies, but if I close out my IMac, I can't access my movies on my laptop???
Can anyone help me out here? Thanks.

I have my itunes stored on my external hard drive of my IMac.
I have started to put my Digital Copies to my IMac with external hard drive, then on my MacBook Pro I can see the movies, but if I close out my IMac, I can't access my movies on my laptop???
Can anyone help me out here? Thanks.

Blue screen on start up with external Hard drive connected

On start up Imac freezes on light blue screen with external hard drive connected via firewire. Starts okay without hard drive connected. I have repaired the drive with no resolution of the problem.

tpetrini wrote:
On start up Imac freezes on light blue screen with external hard drive connected via firewire.
You might try starting the iMac in "verbose mode" by holding down command-V when booting:
http://support.apple.com/kb/HT1492
That could show you some messages that might explain the problem.
Another approach is to launch the Console utility and look for messages dated around the time of a hang.

What format is best for an external hard drive for video editing on a mac?

What's the best format for an external hard drive for video editing to be use with a mac only? I need to format my new hard drive and want to be sure I choose the right format.

I concur with Kappy. His suggestion is correct.
Allan

Windows Easy Transfer (WET) Issues with External Hard Drive - "Can't read from the source file or disk"

I work for Office Depot, in the tech department. Basically, one of our associates was supposed to do a data backup, and re-install Windows 7, then transfer the files back. He used Windows Easy Transfer and compacted everything into a 163 GB file.
Now comes the hard part. When we try to put it back on his computer ((drag-and-drop to the desktop) which has been wiped back to factory settings using the recovery partition), it stops at 79.5 GB remaining (you know how it doesn't give you a % of completion,
it just shows how many GB are remaining) and then says "Can't read from the source file or disk" and gives you an option to try again, or cancel. It gets hung up on the same point each time.
Normally, this wouldn't be a huge issue, but the contents on the drive are his wife's architect blueprints and interior design stuff, along with wedding photos, etc, which are the only copies they have. On top of those, they have court documents and other
important files that we are unable to access now.
I wasn't involved with this transfer, so I'm trying to clean up the mess as best I can. I remembered that the customer's wife was Russian, and had some files typed with a Russian keyboard, so on and so forth. I wonder if that's the issue? If not, I really
have no idea how to manually extract things from a ".mig" file, or how to diagnose what area is potentially corrupted.
In light of this situation, we tried using "Recuva" to recover the files post-wipe, but everything was corrupted or unable to be opened, and it also extracted and recovered all of the "useless" photos, such as the skype logos, up and
down arrows for browsers, etc (it was 160,000+ photos).
Trying to avoid a potential lawsuit, unhappy customer, and costing the company lots of money to see if professionals can get into this external hard drive.
Other relevant information:
We used a Toshiba 500 GB (465 GB) external hard drive.
Customer's computer is an HP Pavilion P6000 Series (Model No. p6520y) running Windows 7 Home Premium 64-bit Service Pack 1.
Any other information that is needed can be provided, thanks in advance, and hopefully we can find a solution to this issue quickly!
-John

I think there's a lack of understanding somewhere.
"If you even can't start the process, please unplug it from your new PC. Then head back to your new computer and plug
the external drive back in to your new computer. "
Unplug from new, head back to new, plug it back in? That doesn't make much sense! Haha.
I knew what you meant though, somewhat. When I search through the drives after clicking yes (Has windows easy transfer
already saved your files blah blah blah) I click on the transfer file and it says "Windows Easy Transfer could not open the file".
Rather than drag-and-drop the file to the desktop, I now tried to double-click on the file itself while it was plugged
into the computer. It opened, and it started transferring until it was about 70% completed, and then an error popped up saying "WET can't open the easy transfer file, make sure your USB device is plugged in or check your internet connection".
I checked, and the USB hard drive's light wasn't on. Now, I unplug it and plug it back in, and the light comes back on,
so I click Retry, and it resets the bar back to nothing and says "Transfer time: 1 minute".
Rather than continue trying, I clicked "Cancel" instead of Retry, and it says "Your transfer did not complete successfully."
It says to click "view report" for more information, but there's no "view report button".
At the moment, I am scanning the External Drive for bad sectors using the check disk tool in properties. It's frozen
at "0 USN bytes processed".

Need Help with External Hard drives and too much music

I am not terribly tech-savvy, and I need your help. I have a G5 PPC dual processor with an internal 250GB drive. I have two seagate firewire/USB2 external hard drives. One is 250GB and one is 350GB. I want to know how to use them to get my Mac to run faster and better.
My original hard drive is 7GB shy of being full. Almost half of this is my itunes library which is over 100GB. The older (250GB) hard drive has about 150GB of photos/videos.
My Mac is running slow as molasses and when I power up the external hard drives it slows down to what I recall my original Mac Plus ran like.
I use the G5 primarily to work with photos, illustrations and creating the occasional DVD with video and photos. the apps I use most often are Photoshop, Illustrator and Painter. I always listen to music while work.
I hope all of this information is helpful! Here is my question:
What is the best way for me to set up and use these external hard drives to return my G5 to its original blazing (to me) fast speed?
PPC G5 Mac OS X (10.4.9)

I think you should look at adding two 500GB internal drives. I'd say Maxtor MaxLine Pro for cost, but they also run much warmer (43ºC even when nearly doing zilch) so I'd go with WD RE2 500GB for $40 ea. more.
dump whatever you don't need, trash anything that is hogging space and is just temp file or useless cache. Web browsers can leave behind a ton of small files eating up tens of MBs.
Use SuperDuper to backup/clone your drive.
Disk Warrior 4 to repair (after it gets to 15% free, or just forget for now).
A 250GB drive formats to 240GB and you have ~3% free it looks like.
For every data drive plan to have two backup drives.
Keep your boot drive to 40% used.
And your data drive to 60%.
Backups can go a little higher.
Drives are cheap and inexpensive, especially for the space and performance. And they have improved SATA over the years it has been out.
By doing a backup followed by erasing your drive, and then restoring it, using SuperDuper, which optimizes the organization, skips copying temp files that aren't needed, it also defragments your files. I would do backup daily to different sets that you "rotate." And before any OS update. And do the erase and restore probably every 2 months.
Make sure you keep one drive partition somewhere that is just your disk utility emergency boot drive that is not a copy of working system, used for doing repairs like running Disk Warrior and Disk Utility.
You may need to repair; backup; even erase and restore your external drives. Rather than spend on vendor made case, just pick up a good FireWire case either with drive, or bare (and add your own). I think it'd add 500GB FW drive though.
Why?
To begin backup of your current drive. To leave your other FW drives "as is" for now.
Then install a new internal 500GB drive as well so you now have a good current backup, and you have moved your data off 250GB to 500GB. If anything happens, you have one off line FW backup.
Then begin to clean up, organize, and get your FW drives working. It sure sounds like they have had some directory or file problems.
You can find a lot of Firewire and SATA drive choices over at OWC:
http://www.macsales.com/firewire/

Using Time Machine with External Hard Drive

Hey everyone,
I had a few questions about Time Machine that I hope someone could answer for me.
I bought my first external hard drive in August, the 1 TB WD My Book for Mac and when I set it up, I configured it to Time Machine, and not the WD software.
I have an extensive music collection, which was my main reason for buying the external hard drive in the first place.
Anyway, when I plug in the hard drive and let Time Machine do the back up, I've noticed that it's backing up the same files every single time, and is eating up a lot of space on the hard drive.
Since I am mainly using this drive to store my music, I was wondering if there was an easier way to do things:
-Is there a way to not back up my documents, photos, applications, etc, every single time I plug in my HD?
-Is there an easy way to find my music on the drive? For example, some Time Machine back-ups have different files on them... i.e. my back up from August 10th has certain music files that do not exist on my backup from November 10th, as I deleted them from my computer after they were backed up to the external HD. I'd love to be able to see all of my music in one place, rather different versions of my music folder on different days.
Any help would be greatly appreciated.
Thanks a lot.

Hi,
1. Your Time Machine should should do the full backup of your computer just once and then only diffrences between backups - whenever you plug in the drive.
If that's not the case something is misconfigured.
2. You can exclude folders (documents, pictures etc) from being backed up. This is in in Time Machine Options (right bottom corner.
3. The drive is (most likely) indexed by Spotlight. However, provided those are backup files I would advise against browsing and searching them directly. This can damage the backup itself.
4. I cannot work out the exact scenario you are using - but the ideal (proper one) would be to have all your music library on your computer and only backup on your external drive. This you should not have to browse and use until you need to restore files.
5. If you keep your music library solely on the external drive - it should be not in the backup files.
Also such practice is risky as all drives crash sooner or later and you will lose your music.
Best would be to keep all music on the computer and backup onto your external drive.
Or
if the music library is too big for your computer you may keep it externally - but Isuggest you get one of the external hard dirves with RAID1 or higher. This will keep your music safer lest one of the drives packs up.
Let me know if you want me to elaborate on any of the aforementioned.
TZ

Time capsule with external hard drive

My wife and I just recently became an all Mac family and I am looking into backing up our files. We have approximatly 1 TB of Photos and 1 TB of Music/Movies. We are photographers (well, my wife is, I just take blurry photos) and so we expect the size of our Photos to grow.
We both have Macbook Pros and a mac mini (1 TB of storage). Connected to our mini is a an 8 TB external hard drive currently set up as a Raid 10, so I have effectivly 4 TB storage with 4 TB of back up. My plan was to buy an Air Port Extreme to replace our 4 year old wireless router, and I see some of the Air Port Extreme's have time capsul storage built in.
My question is, our photos, music and movies will be kept on my EHD, which is mirrored and will make its own back up. Is it worth buying an Air Port Extreme with time capsule to back up everything? We will primarly be keeping programs word documents and home school stuff on the Mini and everything on our Macbook Pros will be files we take from the EHD.
Also, should I plug the EHD into the Air Port Extreme or the Mini?
I formated the EHD on the mini, so it is set up as journaled, not FAT32.

Connected to our mini is a an 8 TB external hard drive currently set up as a Raid 10, so I have effectivly 4 TB storage with 4 TB of back up.
I would quibble with you on the use of the word backup.. Mirror yes.. you have a mirror.. but that does not represent a backup. But you also suggest later that you have a separate backup as well .. if so you have not listed what exactly this is.
The issue is if you delete a file.. it is deleted from the array.. if you manage to corrupt a file.. it is corrupted in the array.. worse yet.. if you corrupt a library.. very real possibility with the way apple stores files.. and I do hope your are storing original RAW versions.. so the library will then be corrupted in both sections of the array.
How is this connected to the mini? I hope it is a recent mini and using thunderbolt??
The best backup imho is a 4TB drive plugged into the array by usb or whatever is the fastest port it has.. esata would be great.. expensive but thunderbolt even better. Does the software with the array have some inbuilt backup?? They are usually the best way to do it. I would even consider a second cheap USB stored offsite.. friends house. Thieves love those big disk arrays.. they are worth a lot of money.. and they collect your TC/AE along with the rest.
Now all this might be already part of what you are doing so please take it simply that you didn't list it.
My question is, our photos, music and movies will be kept on my EHD, which is mirrored and will make its own back up. Is it worth buying an Air Port Extreme with time capsule to back up everything? We will primarly be keeping programs word documents and home school stuff on the Mini and everything on our Macbook Pros will be files we take from the EHD.
Also, should I plug the EHD into the Air Port Extreme or the Mini?
I formated the EHD on the mini, so it is set up as journaled, not FAT32.
You can use Time Machine in the notebooks to do a backup of the current configuration of them. Without needing to do the backup of the EHD which is really too big to do effectively. TM is very good at keeping incremental backups.
A Time Capsule is good value considering the price of the hard disk now.. so you can buy an Extreme and run it with USB drive.. but the TC with inbuilt drive is a better option in that the drive speed of the internal far superior to the usb2 drive.
The new AC models are still somewhat buggy.. I think I would wait a bit for Apple to get their act together.. a few months probably. Of course I only see the people with issues here.. but the firmware is still immature.
I read a review recently by a guy I respect on our local forum.
http://forums.whirlpool.net.au/forum-replies.cfm?t=2125865
Compared to the Asus N66U model.. the AE wasn't even in the same class. And that is not AC but just 900mbps (so called) N wireless. That the AE was totally outclassed is somewhat of a surprise.. they are basically identical.. the chipset both use is standard broadcom. That means Apple has tried to do funny stuff instead of sticking with the broadcom OEM linux firmware.. they have to rewrite it in NetBSD.. and this is going to take some time to debug.
For now you can use TM to network drive,, just as easily as to a TC.
See http://code.stephenmorley.org/articles/time-machine-on-a-network-drive/
This is plainly opinionated.. and others might be in better position to post.. so go ahead and tear me to shreds.. but I would take great care.. before leaping at new edge technology.. unless you like the bleeding edge.

How to configure iPhoto in my setup with external hard drive

Hi there,
I've been digging around for answers but I'm still not clear on what the right path is.
I have a new MacBook Air. For the obvious reason (space) I don't want to keep my photos on it. I have a functioning MacBook with a dead backlit screen. I can run it easily with an extended monitor. I have a new 2 Terrabyte Seagate Go Flex Home external drive that is my Time Machine backup.
I'm thinking that I should be able to have all my photos on the external hard drive and access them from my MacBook Air. But I don't know what the "best" or "easiest" or good route is to follow.
1) Can I move the my current MacBook iphoto library to the external Seagate Go Flex HD? ? There's an issue of the right formatting, yes? How would I know?
2) Should I skip using Iphoto and simply store photos? I don't love that idea.
3) Should I keep my old photos on the MacBook and access them from my Macbook Air? I have a 500 gig drive on that machine. If so, I need to make sure it never goes to sleep, yes?
4) If I do that can I set up the Air so that the photos go tot he MacBook?
4) Macbook has iPhoto '08. The Air has iPhoto '11. Is that an issue?
Is this all easier than I'm thinking? Or is is complicated?
THanks for your help,

You can move your iPhoto library to any directly connected hard drive that is formatted Mac OS extended (Journaled)
You can NOT share a single volume between a Time Machine backup and any other dynamic files ike the iPhoto library - TM continues to fill the drive until it is full and at that time iPhoto would quit working
You can not share a library with different versions of iPhoto
IMHO using a MBP as the drive for a MBA wouod not work well and might cause problems
My suggestion is to move your liberary to a new external drive -
Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - depress the option key and launch iPhoto using the "select library" option to point to the new location on the external drive - fully test it and then trash the old library on the internal drive (test one more time prior to emptying the trash)
And be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats) and that it is always available prior to launching iPhoto
And backup soon and often - having your iPhoto library on an external drive is not a backup and if you are using Time Machine you need to check and be sure that TM is backing up your external drive
And create a new library on your MBA for protable use and for current photos and use iPhoto Library Manager - http://www.fatcatsoftware.com/iplm/ - to move photos between the iPhoto library on the EHD and the MBA
LN

New Apple User - Trouble with External Hard Drive

I am not very good with computers so hopefully this is a simple task. I just purchased my first mac, a MacBook for college. I bought a Seagate FreeAgent 160 GB drive with the intent of using it for time machine back ups and also for storing my music. I am wondering how or if this is possible.
So far I have:
- Transferred all my music from my PC to the hard drive no problem.
- I tried to set up Time Machine it said I had to delete everything from the Seagate drive in order to use it.
- I then copied all my files off of the hard drive to my Macbook's HD.
- Found out I also need to reformat my Seagate drive to Mac format.
Now I am wondering how to go about all of this and find out if its possible to store my music files on my hard drive as well as use it to for TM. I was thinking I can just move all my music back to the Seagate after TM erases it...would that work or is TM back-ups the only thing you can have on a drive?
Thank you!

Larko,
Generally speaking, you'll need an external hard drive with a capacity that is at least twice the size of the space being used on your internal hard drive. So, if you only have around 30 GBs of data on your new Macbook, you'll need at least 60 GBs for Time Machine. I'm going to state, though, that you'll probably end up using something more like 50 GBs on your Macbook's hard drive, so plan on using around 100 GBs for Time Machine.
Now, what you'll need to do first is format the external drive using Disk Utility (/Applications/Utilities/Disk Utility). In Disk Utility's "source list" at the left side of the window, select your external drive (not the named "volume" that will appear indented below it), then switch to the "Erase" tab. Erasing the entire hard drive will re-write the partition map, using the Apple "GUID" partition scheme (required for use with Time Machine).
If you want to store additional files on the external, that's OK. However, it is recommended that instead of storing both your Time Machine backup and your "personal" files on the same volume, that you partition the drive with 2 partitions. This will allow you to store the Time Machine backup in isolation on its own volume, and your "personal" files on the second. Disk Utility will handle this, too. Instead of erasing, switch to the "Partition" tab, use the pull-down menu to select 2 partitions, adjust the sizes according to your needs, then click "Partition."
I recommend that you size the first partition (for use with Time Machine) at 100 GBs, and the second with the remainder (which will end up being about 40 GBs).
You can certainly store that 10 GBs of music separately, but wouldn't it be best to import it into iTunes? If you do import it, or if it is kept on your Macbook in some other place, it will be backed up by Time Machine.
Scott

Backup problems with external hard drive

I bought a WD passport external hard drive and copied my itunes library onto a file there. I re-set the location of the library on itunes to the drive on the external hard drive. So far I have not deleted anything from my computer hard drive. However, when I am in itunes and click onto a song, nothing comes out of my speakers. Everything looks normal, as if the track is playing, but nothing is happening. I tried buying a new track off of itunes online, downloaded it, and installed it on my ipod; it plays fine, on my ipod, but will not play on the computer. Something is obviously wrong, but I can't figure out what has happened. Any help out there?
Thanks!
Delany

It sounds to me like your iMac is on it's last legs....at least the internal hard drive. If you can't make a new Time Machine backup I would advise you replace your iMac as soon as possible.
Assuming your three-week old backup is sound you should have no problems moving everything over to a new Mac. I would recommend you use the Setup Assistant that appears when you start up the new Mac (and note: It only appears the first time you start the new Mac; you can move everything over later on via Migration Assistant, but you may see issues with accounts if you opt for that route).
I don't think you need the Genius Desk for Setup Assistant. You only have to power up the new iMac, answer a few questions....select "....From Another Disk..." When it asks how you want to move everything over....connect up your Iomega external drive...and wait for it to finish. (Could take several hours depending on the amount of data you're moving).
A couple of notes:
1. If your Iomega is a Firewire drive you'll need a Firewire to Thunderbolt adapter to connect it to your new iMac.
2. If you need to load CDs or DVDs remember the new iMacs don't contain an optical drive. You would need to get an Apple SuperDrive or third part external burner if you need that functionality.
I'm puzzled by the comment made in Seventy One's post questioning the reliability of the new iMacs. I upgraded from a 24" early 2008 model to a 27" model and everything works flawlessly. I hardly ever see the beachball anymore.

What's 'best-practice' with external hard drives?

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