External Hard Drive won't mount in finder but shows up in Disk Utility.

Discussion in 'Mac Basics and Help' started by HRGRiff, Jul 8, 2012.

  1. HRGRiff macrumors newbie

    Joined:
    Jul 8, 2012
    #1
    Ok,

    I've read a few posts and tried the solutions suggested but still can't get access to this external. Running Mac OS X 10.7.4 on a Mid-2009 MacBook Pro 13 with a HENGE Dock. My IOMEGA 320 GB Hard Drive holding the bulk of my iTunes library will show up in Disk Utility (and Disk Manager on a Windows 7 computer, but it won't mount. I verified the SAMSUNG hard drive as follows:

    "Verifying partition map for “SAMSUNG HM320JX Media”
    Checking prerequisites
    Checking the partition list
    Checking for an EFI system partition
    Checking the EFI system partition’s size
    Checking the EFI system partition’s file system
    Checking all HFS data partition loader spaces
    Checking Core Storage Physical Volume partitions
    The partition map appears to be OK

    Verifying and repairing partition map for “SAMSUNG HM320JX Media”
    Checking prerequisites
    Checking the partition list
    Checking for an EFI system partition
    Checking the EFI system partition’s size
    Checking the EFI system partition’s file system
    Checking all HFS data partition loader spaces
    Reviewing boot support loaders
    Checking Core Storage Physical Volume partitions
    Updating Windows boot.ini files as required
    The partition map appears to be OK"

    So that all sounded good. But when I do the same on the iTunes and Media partition it comes up with:

    Verifying volume “iTunes and Media”
    Checking file systemChecking Journaled HFS Plus volume.
    Invalid key length
    Invalid record count
    Catalog file entry not found for extent
    The volume could not be verified completely.
    Error: This disk needs to be repaired. Click Repair Disk.

    Verify and Repair volume “iTunes and Media”
    Checking file systemChecking Journaled HFS Plus volume.
    Invalid key length
    Invalid record count
    Catalog file entry not found for extent
    The volume could not be verified completely.
    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.

    Is there anything out there that will help me mount this drive so I can back up or recover as many of these files as I can?

    HRG
     
  2. BrianBaughn macrumors 601

    BrianBaughn

    Joined:
    Feb 13, 2011
    Location:
    Baltimore, Maryland
    #2
    First, it's possible that the drive has some bad blocks on it and is about to die. Could be that nothing will get it back to normal. Since it's external you can't check the SMART status.

    Rebuilding the partition's directory with Diskwarrior is the first thing I'd try. If your stuff isn't backed up it might be worth the $100 bet. DW is very good at fixing (rebuilding) the directory errors that Disk Utility can't. Hopefully DW can see the partition since DU is able to.

    If you do get it to mount, recover your files ASAP.
     
  3. HRGRiff thread starter macrumors newbie

    Joined:
    Jul 8, 2012
    #3
    Thanks

    I'll give DiskWarrior a try. Looks like a handy program to have around in any case. Thanks
     
  4. ch2010 macrumors newbie

    Joined:
    Sep 27, 2012
    #4
    same problem, different hardware

    mid-2007 MacBook Pro, two external drives - one 3 TB Western Digital USB, the other a 2 TB Seagate FireWire. Same problem since upgrading to Lion - I could have written your Disk Utility messages for you. Most frequently with the FireWire drive but now also with the USB drive. Sometimes Disk Utility can repair, sometimes I have to use DiskWarrior. Always after a system restart but sometimes after system sleep. I have multiple remote backups so I'm not worried about losing data but I'm getting tired of repairing drives. I was waiting to go to Mountain Lion until I stabilized the drive situation but now I think I should either go ahead and upgrade or go back to Snow Leopard.

    No advice to offer, just more data.
     

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