Disk Utility can't repair TM backup disk

Hello all
Recently, my external backup disk (a 750 GB WD My Passport) that I use with Time Machine has been acting up. At first, it wouldn't show up on the desktop, but was being recognized in Disk Utility (with the "Time Machine Backup" partition greyed out). After multiple restarts and unplugging/replugging the hard drive, I finally got to be properly recognized, i.e. it showed up on the desktop with the proper Time Machine hard drive icon. So I thought the problem was gone and started a routine backup. However, Time Machine returned an error:
"Unable to complete backup. An error occurred while creating the backup folder."
I search the forums, and followed the advice here: http://web.me.com/pondini/Time_Machine/C10.html
I tried repairing the disk, but DU couldn't repair it:
Verify and Repair volume “Time Machine Backups”
Checking Journaled HFS Plus volume.
Detected a case-sensitive volume.
Checking extents overflow file.
Checking catalog file.
Incorrect number of thread records
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Checking multi-linked directories.
Checking volume bitmap.
Checking volume information.
Invalid volume file count
(It should be 3991498 instead of 3904049)
Invalid volume directory count
(It should be 678218 instead of 673790)
Invalid volume free block count
(It should be 9588404 instead of 11784378)
Volume header needs minor repair
The volume Time Machine Backups was found corrupt and needs to be repaired.
Volume repair complete.Updating boot support partitions for the volume as required.
Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
So now I'm still following the advice on the above mentioned page by posting on here. Any help at all would be greatly appreciated. I am using a 2010 15in 2.66 i7 MBP, if that makes a difference, although my guess is the problem's with the harddrive itself. I think there may have been one time about a month ago when Time Machine stopped responding (or something like that) which forced me to pull out the harddrive, possibly corrupting the data. But I'm not sure, and I do recall making at least one successful backup after that. Well, actually TM confirms this: "Latest successful backup: 5/27/11 at 11:51 PM". So I have no idea what's going on. Again, any help would be appreciated.

You can't tell what's corrupted or where.  Time Machine backups have a very complex structure, all linked together.  So, you can often do new backups, or restore individual items, or even entire backups, as long as you don't stumble over the damage.
There's a chance a heavy-duty 3rd-party disk repair app, such as Disk Warrior, can repair them.  It's about $100, and probably a good investment for the future, but there's no guarantee it can fix them.
If not, or if you don't want to spend the money, your only option is to erase the disk and let Time Machine start fresh.
It sounds like you may have other data on it; if that's in the same partition, that's not a good idea.  This is a good time to copy the data off, erase the disk, and make 2 (or more) partitions on it, so Time Machine has its own, exclusive space.  See #3 in Time Machine - Frequently Asked Questions for details and instructions.

Similar Messages

  • Disk utility can't repair time machine disk - File system check exit code is 8

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  • After getting the dreaded gray/blue screen, I tried to run disk repair on the internal disk. I got an error message saying "Disk Utility can't repair this disk and restore your backed-up files. The volume Macintosh HD could not be verified completely

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  • External Hard Drive Disk Utility Can't Repair the Disk

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  • Disk utility can't repair a partition on external hard drive

    I have a 1TB Western Digital external FW drive that's only a couple years old (2 or 3, probably). I have it split into partitions, one of which I'm using for Time Machine. The non-Time Machine partition checked out fine with DIsk Utility, but when I ran Disk Utility on the Time Machine partition, I received this message:
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    Brad Cook wrote:
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    (But then, I'd never trust my backups to any single drive, no matter how new or high-quality.)

  • Disk Utility can't repair this disk

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  • Disk Utility can't repair Macintosh HD.  What should I do?

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    AMBKK wrote:
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  • Macbook Pro (mid 2012) Disk Utility can't repair HD

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