Cannot regain access to external drives.

The USB external hard drives attached to my Mac Pro, which is running 10.6.8, are not allowing me access, saying I do not have permission. There is a lock on the desktop icon for each of them. I tried changing them in the Get Info box but all permission settings revert back to saying "custom" immediately. I also tried using Disk Utility to repair permissions and repair the disks without success.
It all started after I tried to share the drives on my local network using the Sharing control panel in System Preferences. There were many, many messages that came up saying such and such file (each file name was different) could not be modified but I thought I clicked on the option that would not affect those files, leaving them unchanged.
One of the drives is used primarily as a Time Machine back up drive. the other has a lot of irreplaceable data on it. I would like to recover the latter rather than reformat it. I could reformat the Time Machine drive if necessary, but I would rather not.
Also, I cannot perform an fsck -yf in single user mode (command & S at start up) and my drawing tablet is no longer available for use.
Perhaps the system on the Mac Pro is hosed and needs to be reinstalled. Do you think that will fix it?
All help would be greatly appreciated.
Thanks.

I have the exact same issue! Whats the deal...
Cant copy too or from any type of external drive. This is ludicrous!
File appears for a split second then dissapears. I coppied a document to a usb drive and left to work, plugged in my usb drive and whoops! I thought to myself "No way i remember copying it"
Luckily i had also saved to dropbox!
Apple do something!
Tried mac journaled and FAT32...no luck.

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Message was edited by: Topher Kessler

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O Bell wrote:
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Update from what to what? ??? ?? ?
Platform: Mac or Win?
A lot more information about your hardware and software is needed.
BOILERPLATE TEXT:
If you give complete and detailed information about your setup and the issue at hand,
such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CC", but something like CC2014.v.2.2) and of Bridge,
your settings in Photoshop > Preference > Performance
the type of file you were working on,
machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
what error message(s) you receive,
if having issues opening raw files also the exact camera make and model that generated them,
if you're having printing issues, indicate the exact make and model of your printer, paper size, image dimensions in pixels (so many pixels wide by so many pixels high). if going through a RIP, specify that too.
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etc.,
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Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
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Try rebuilding both your Photoshop and your Bridge preferences:
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Note: If this process doesn't work for you while you're using a wireless (Bluetooth) keyboard, attach a wired keyboard and retry.
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Reinstalling Photoshop does not remove the preferences file. Before reinstalling Photoshop, re-create your preferences.
NEW Video! Julieanne Kost created a video that takes you through two ways of resetting your Photoshop preferences. The manual preference file removal method is between 0:00 - 5:05. The keyboard shortcut method is between 5:05 - 8:18. The video is located here:
How to Reset Photoshop CS6’s Preferences File | The Complete Picture with Julieanne Kost | Adobe TV
Mac OS
Important: Apple made the user library folder hidden by default with the release of Mac OS X 10.7. If you require access to files in the hidden library folder to perform Adobe-related troubleshooting, see How to access hidden user library files.

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Mac os x 10.7.3
I am having serious issues with iTunes.
I dont know what changed but now i can no longer open itunes. It crashes before it even launches it seems like.
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Process:         iTunes [1552]
Path:            /Applications/iTunes.app/Contents/MacOS/iTunes
Identifier:      com.apple.iTunes
Version:         10.6 (10.6)
Build Info:      iTunes-10604001~1
Code Type:       X86-64 (Native)
Parent Process: launchd [144]
Date/Time:       2012-03-24 20:03:25.940 -0700
OS Version:      Mac OS X 10.7.3 (11D50)
Report Version: 9
Interval Since Last Report:          52227 sec
Crashes Since Last Report:           33
Per-App Interval Since Last Report: 104514 sec
Per-App Crashes Since Last Report:   33
Anonymous UUID:                      698A0C30-4EF4-4DDD-BBCF-DB27A83CF81B
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000110e8e194
VM Regions Near 0x110e8e194:
    MALLOC_LARGE           0000000110d6e000-0000000110d72000 [   16K] rw-/rwx SM=PRV
-->
    MALLOC_LARGE           0000000110eea000-0000000110f73000 [ 548K] rw-/rwx SM=PRV
Th

See Recover your iTunes library from your iPod or iOS device.
tt2

Cannot regain access to external drives.

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