MacBook Air No Longer Sees Remote External Drive

I have an iMac with a FW800 connected external hard drive. I use it for Time Machine backups. Also use an Airport Extreme for wireless connection. My MacBook Air at one time was able to "see" that external drive via the Airport and I used it to backup the laptop with Time Machine. Now, all of a sudden, the MBA no longer sees the external drive. What has happened? I use the MBA only occasionally, and told Time Machine to backup only when I tell it to. So, LOTS probably has changed since the last backup. But, what change has broken this connection? My iMac sees it just fine and does Time Machine backups just fine. When I want to share the DVD drive of the iMac, that works as it should. I just can't see that dang external drive any longer. Both machines are at 10.5.6
Can you folks give me some places to start looking to get things working again?

Does the time machine volume meet the requirements?
-internal drive, not start up disk
-XSAN volume
-USB drive
-fire wire drive
-eSATA drive
-network server via AFP (from machines running Leopard), including machines running file sharing
the volume must be formated as Mac OS Extended or Mac OS Extended (case-sensitive)
You can't use:
-Boot Camp partition
-iPod
-disk image
-AirPort Disk
-iDisk

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-XSAN volume
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I need you help with this one. My MacBook Pro no longer "sees" my LACie external hard drive. In the System Profiler (under FireWire) the drive is listed as:
FireWire Bus:
Maximum Speed: Up to 800 Mb/sec
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Manufacturer: Unknown
Model: Unknown
Maximum Speed: Up to 800 Mb/sec
Connection Speed: Unknown
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My MacBook Pro no longer "sees" my LaCie External Drive

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I need you help with this one. My MacBook Pro no longer "sees" my LACie extrenal hard drive. In the System Profiler (under FireWire) the drive is listed as:
FireWire Bus:
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Connection Speed: Unknown
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HI,
MacBook Pro Mac OS X (10.5.8)
You posted in the Safari forum. Try posting in the Leopard or MacBookPro forum instead.
MacBookPro Forum
Leopard Forum
Did you free up disk space? http://discussions.apple.com/message.jspa?messageID=12132180#12132180
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I'd love some help trying to figure out why my 2008 MacBook no longer recognizes my external drive and now is not downloading photos from my iphone....?

After many years of having no problems at all on my Macbook, I recently figured I should finally upgrade my OS. I did that about three weeks ago, updating to Snow Leopard (10.6.8). I used Time Machine at least once after the OS upgrade but now Time Machine no longer recognizes the external drive I have used for all these years to back up. The MacBook does not "see" it. (Disk Utility does however.) The computer then also stopped recognizing another La Cie back-up that I have and now... my iPhone cannot download photos? Yikes.
I have, of course, shut down numerous times, used different cables (that worked for some) and the two USB drives. I even used a firewire. Nothing worked. I also tried to "Repair disk" on Disk Utility. It didn't work either, giving me an error (that I didn't save, sorry).
I read many other discussions on the file format of the external drive and of course I'd be happy to reformat the external drives--however, it is obviously a tad nerve-wracking to reformat drives before having an accessible back-up. Suggestions? I do not remember what file format they have but am pretty sure it's not the Mac file system someone mentioned. The drives are a 2009 WD "My Passport Elite" and La Cie 2007 d2 Quadra,
In terms of other hardware available, we do have another MacBook Air but it has started rejecting both drives as well (without the Snow Leopard upgrade). We have an old Dell but it wouldn't have the disk space to help out much.
Any thoughts on the process involved would be welcome. Any ideas on the iPhone rejection would be helpful as well! It is a 30gig iPhone 4 that has 20 or so gigs free (not clear as iTunes says that there are abour 18 Gigs on the phone but 24 free gigs? I may be bad at math but that's 40 gigs...).
I am checking out iCloud but apparently there are only 55 gigs available?
Will be glad to hear any thoughts. Thanks!

Good afternoon Lyssa,
Phew. First of all, thanks in advance...these blogs are always comforting help!
So, to answer your questions: For the age of the hard drive.Well, I added memory a couple of years ago (RAM and hard drive). Being a mom leads me to eat up a fair amount of gigs with photos of my kids and, in fact, I think I entirely replaced the original drive, so it is a couple years younger than 2008 since I did that in March 2010. If there is some way to verify that (whether or not I replaced the entire drive), I'm all ears. I have 311 Gigs free, so it is not a space issue. I verified the startup disk on Disk Utilityand nothing showed up.
Question 1- What formats...
The La Cie is format Windows NT Filesystem 3G ....At the time that I bought it I was still using a PC as well as a Mac and was told by afriend to use this format...
The WD is Mac OS Extended (Journaled). I again tried to repair the WD last night and this is the error message: "Error: DiskUtility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files."
Also, Time Machine tried again to back-up and gave me this error: "Files can't becopied onto the backup disk because it appears to be 'read only'. You may needto repair or reformat the disk using Disk Utility. If the disk can't berepaired, you must use a different disk for backups. Open Time Machinepreferences to select a different backup disk."
Question 2. Other cables...
I used two other cables with the WD and that didn't change anything.
Question 3... Fire Wire from the La Cie
Yes, I used the Firewire cable from the La Cie and it is indeed present, though still not visible in Finder. Since it is not Mac OSExtended I know that I can't use Time Machine with it.
So, in summary...
I can plug in the La Cie and it is functional on the MacBook, visible on Disk Utility but not visible in Finder. The WD drive is not visible and not functional. So we can think it is indeed the WD that is not working.... Also, the iphone photos did, in the end, get downloaded, so it is not something more general.
Causes...
I forgot to mention that there is a "lost+found" file on the WD which apparently points to a UNIX /OS issue?
Some kind of "insurance"?....
I'm curious about how people avoid this kind of issue. You just regularly replace back-up drives and hard drives before problems come up? Time Machine is great and saves many of us from disasters, however, knowing that your Time Machine back-ups are vulnerable makes the whole system insecure. No way to have alarms ring before the drive goes out?
As for ways ahead...
It seems that I ought to be able to copy off of the WD to the MacBook then erase it and reformat it and start over again. However, I haven’t been able to see its contents except on random occasions. If you have any ideas on how to copy the Time Machineback-ups from the WD, again, I'm all ears!
Good afternoon Lyssa,
Phew. First of all, thanks in advance...
So, to answer your questions:
For the age of the hard drive. Well, I added memory a coupleof years ago (RAM and hard drive). Being a mom leads me to eat up a fair amountof gigs with photos of my kids ….and, in fact, I think I entirely replaced theoriginal drive, so it is a couple years younger than 2008 since I did that inMarch 2010. If there is some way to verify that, I'm all ears. I have 311 Gigfree, so it is not a space issue. I verified the startup disk on Disk Utilityand nothing showed up.
Question 1- What formats...
The La Cie is format Windows NT Filesystem 3G ....At thetime that I bought it I was still using a PC as well as a Mac and was told by afriend to use this format...
The WD is Mac OS Extended (Journaled). I again tried torepair the WD last night and this is the error message: "Error: DiskUtility can’t repair this disk. Back up as many of your files as possible,reformat the disk, and restore your backed-up files."
Also, Time Machine tried again to back-up and gave me thiserror: "Files can't be copied onto the backup disk because it appearsto be 'read only'. You may need to repair or reformat the disk using DiskUtility. If the disk can't be repaired, you must use a different disk forbackups. Open Time Machine preferences to select a different backup disk."
Question 2. Other cables...
I used two other cables with the WD and that didn't changeanything.
Question 3... Fire Wire from the La Cie
Yes, I used the Firewire cable from the La Cie and it isindeed accessible, though still not visible in Finder. Since it is not Mac OSExtended I know that I can't use Time Machine with it.
FYI...
So, in summary... I can plug in the La Cie and it is “functional” on theMacBook but not visible in Finder. The WD drive is not visible and notfunctional. So we can think it is indeed the WD that is not working.... ALSO,the iphone photos did, in the end get downloaded.
As for ways ahead…
It seems that I ought to be able to copy off of the WD tothe MacBook then erase it and reformat it and start over again. However, Ihaven’t been able to “see” its contents except on random occasions…
Any further thoughts are welcome!

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MacBook Air No Longer Sees Remote External Drive

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