Disk Utility can not repair My Passport for Mac

I'm still learng much about Macs. I have a MacBook Air with a 1TB My Passport for Mac as an external HD. A few things have been acting a little strange, so I decided to run the Disk Utility. After running the Verify disk, it says that the volume needs to be repaired. When I try running the Repair Disk, I get a message saying :
Verify and Repair volume “My Passport for Mac”
Volume repair complete.
Updating boot support partitions for the volume as required.
Error: Couldn’t unmount disk.
Is this OK, do I need to do something more?
I used the HD as extra storage as the SSD on the MBA isn't enough for my needs. I store 2nd libraries for iTunes and iPhoto on the My Passport. I ocasionally get error messages where neither will work and I end up having to dismount the HD and sometimes restart the MBA in order to make either work. My problems could be more than my original question, but I don't know enough yet on where else to start.

Repair the Hard Drive and Permissions - Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.

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    Best regards
    arjello
    Message was edited by: arjello
    Message was edited by: arjello

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  • Disk Utility can't repair Time Machine + HDneeds to be repaired using the Recovery HD

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    AMBKK wrote:
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    Do that first. 
    If that's not clear, see the yelow box in #6 of Using Disk Utility.

  • Disk utility can't repair the Macintosh HD, asking toback up all files as possible? and how to  reformat the disk?

    disk utility can't repair the Macintosh HD, asking toback up all files as possible? and how to  reformat the disk?

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    Disk Utility cannot repair Macintosh HD
    However, in this scenario, my friend does not have any Time Machine backups and would like to recover his files.
    I know that I can re-format and do a fresh install of OS X...but where does that leave me with file recovery?
    Is it possible to retrieve the files at all?
    Any help from the community would be GREATLY appreciated!
    Thanks

    I have a friend's MacBook Pro in my possession that is not working and has not been used for about two months. After startup, seeing the loading bar, and getting stuck on the spinning wheel of death, I have taken some steps to try to get a boot into Mac OS X. I've reset the PRAM, tried booting in safe mode, and lastly tried to repair Macintosh HD via Disk Utility in the recovery partition. No luck. I get this message after an attempted repair.. "Disk Utility can't repair this disk...disk, and restore your backed up file".
    This is a similar problem to this discussion thread here:
    Disk Utility cannot repair Macintosh HD
    However, in this scenario, my friend does not have any Time Machine backups and would like to recover his files.
    I know that I can re-format and do a fresh install of OS X...but where does that leave me with file recovery?
    Is it possible to retrieve the files at all?
    Any help from the community would be GREATLY appreciated!
    Thanks

  • Macbook pro won't boot and when I tried to back up the hard drive I got "disk utility can't repair this disk backup as many of your files as possible"

    My macbook pro froze and initially would not even recognize the power chord. Now it charges, but will not load up. I opened in in disk utility to try and back it up so that I could take it to apple to have it fixed but I got the message that said "disk utility can't repair this disk backup as many of your files as possible". How do I back up the files???

    Nichelle215,
    you can try the method described on this Apple page, in the “Instructions for backing up to an external hard disk via Disk Utility” section. (You can skip step 6, since you already know that your disk is irreparable.) Note, however, that this method is not guaranteed to work. Once you get your disk straightened out, you might consider purchasing an external hard disk for use as a Time Machine backup destination, so that a similar problem in the future won’t wipe out the only copy of your files.

  • Error: Disk Utility can't repair this disk.

    My Server's non-boot volume, while using Disk Utility I get the message Volume bitmap needs minor repair for orphaned blocks.  Then checking volume information.  Invalid volume file count.  It should be 472587 instead of 472588; Invalid bolume free block count.  It should be 236325120 instead of 236325119.  The volume was found corrupt and needs to be repaired.  Volume repair complete.  Updating boot support partitions for the volume required.  Error: Disk Utility can't repair this disk.
    I received this error a month ago and replaced the drive.  It worked fine for a month, but now I receive the same message.

    Did you restore from a time machine backup? If so, what i would suggest is doing an erase then reinstalling, do not restore from time machine during intail setup. Setup a fresh account then use migration assistant to restore from your backup.

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