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  1. #1


    Member Since
    Mar 31, 2011
    Posts
    2
    Unable to mount external drive.
    I've been searching for an answer to this situation but haven't been able to find it in any of the forums. I have a Western Digital Caviar SE 250GB drive in a Rosewill USB 2.0 external enclosure and the drive will not show up in Finder. I go into Disk Utility and it shows up there but the drive is grayed out. When I go to mount it, I get an error that it is unable to mount and to try First Aid. I do that and everything looks fine, but still won't mount. I purchased DiskWarrior 4.0 and booted it up, but the drive does not show up in the list. I can rule out the external enclosure because it also happens with another enclosure using both USB & FireWire 400, on multiple machines (Macs & Pcs), and more importantly, I also have another Seagate 300gb drive that works fine in the same enclosure.

    I'm fresh out of ideas at this point. Has anyone had any experience with this situation, where the drive appears to be fine, shows up in Disk Utility, but will not mount? Just trying to at least save the data.

    I tried some diskutil commands from terminal just to show what's going on, and the only thing I noticed out of the ordinary was that it says "Volume Free Space: 0 B (0 Bytes) (exactly 0 512-Byte-Blocks)":

    brussell@brussell ~$ diskutil info MediaMovies
    Device Identifier: disk1s3
    Device Node: /dev/disk1s3
    Part Of Whole: disk1
    Device / Media Name: Untitled

    Volume Name: MediaMovies
    Escaped with Unicode: MediaMovies

    Mounted: No

    File System: Journaled HFS+
    Type: hfs
    Name: Mac OS Extended (Journaled)
    Owners: Disabled

    Partition Type: Apple_HFS
    Bootable: Not bootable
    Media Type: Generic
    Protocol: USB
    SMART Status: Not Supported
    Volume UUID: 1A1A3E5D-8826-3F4F-A8A0-448553F68251

    Total Size: 249.9 GB (249925091328 Bytes) (exactly 488134944 512-Byte-Blocks)
    Volume Free Space: 0 B (0 Bytes) (exactly 0 512-Byte-Blocks)

    Read-Only Media: No
    Read-Only Volume: Not applicable (not mounted)
    Ejectable: Yes

    Whole: No
    Internal: No

    brussell@brussell ~$ diskutil mount MediaMovies
    Volume on disk1s3 failed to mount
    brussell@brussell ~$ diskutil eject MediaMovies
    Disk MediaMovies ejected
    brussell@brussell ~$ diskutil mount MediaMovies
    Volume on disk1s3 failed to mount
    brussell@brussell ~$ diskutil eject MediaMovies
    Disk MediaMovies ejected
    brussell@brussell ~$ diskutil unmount MediaMovies
    disk1s3 was already not mounted
    brussell@brussell ~$ diskutil mount MediaMovies
    Volume on disk1s3 failed to mount
    brussell@brussell ~$ diskutil verifyVolume MediaMovies
    Started filesystem verification on disk1s3 MediaMovies
    Checking Journaled HFS Plus volume
    Checking extents overflow file
    Checking catalog file
    Checking multi-linked files
    Checking catalog hierarchy
    Checking extended attributes file
    Checking volume bitmap
    Checking volume information
    The volume MediaMovies appears to be OK
    Finished filesystem verification on disk1s3 MediaMovies
    brussell@brussell ~$ diskutil repairVolume MediaMovies
    Started filesystem repair on disk1s3 MediaMovies
    Checking Journaled HFS Plus volume
    Checking extents overflow file
    Checking catalog file
    Checking multi-linked files
    Checking catalog hierarchy
    Checking extended attributes file
    Checking volume bitmap
    Checking volume information
    The volume MediaMovies appears to be OK
    Volume repair complete
    Updating boot support partitions for the volume as required
    Finished filesystem repair on disk1s3 MediaMovies
    brussell@brussell ~$ diskutil mount MediaMovies
    Volume on disk1s3 failed to mount

  2. #2


    Member Since
    Mar 31, 2011
    Posts
    2
    Well, it turns out I spoke too soon! I tried to install the DiskWarrior software and run it instead of booting off of the DVD, and this time it found the drive and restored it! What a great piece of software! The drive now mounts correctly and I have access to all of the files.

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