When I try to format my Western Digital "MyBook" external drive, I get an error..

Discussion in 'Mac Basics and Help' started by seenew, Aug 19, 2008.

  1. seenew macrumors 68000

    seenew

    Joined:
    Dec 1, 2005
    Location:
    Brooklyn
    #1
    It says "could not unmount the disk."
    What does this mean, and how do I fix it?

    Also, what's the difference between Mac OS Extended (Journaled) and not journaled?

    Thanks!
     
  2. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #2
    You might have to recreate the partition table… Like where it says GUID, MBR, etc. Well it fixed mine when I changed it.

    And Journal is if you want Spotlight indexing.
     
  3. seenew thread starter macrumors 68000

    seenew

    Joined:
    Dec 1, 2005
    Location:
    Brooklyn
    #3
    Thanks for the reply!

    I tried repartitioning it just now as you suggested, and it gives the same error of "could not unmount the disk" :(
     
  4. aross99 macrumors 68000

    aross99

    Joined:
    Dec 17, 2006
    Location:
    East Lansing, MI
    #4
    Does the drive show up on your desktop? That is what happens when the drive is mounded. Unmounting the drive means to eject it, or take it off the desktop.

    I agree that partitioning it (GUID) and formatting it (Mac OS Extended Journaled), is what you want - assuming there isn't anything on the drive you care about...
     
  5. seenew thread starter macrumors 68000

    seenew

    Joined:
    Dec 1, 2005
    Location:
    Brooklyn
    #5
    I got it to work by booting from the install disk and using Disk Utility from there, in case anyone was wondering.
     
  6. bugsnelson macrumors newbie

    bugsnelson

    Joined:
    Dec 16, 2008
    #6
    Format WD MY BOOK for Mac

    This worked for me; all the previous suggestions did not-
    First, there is a firmware update for the My Book Home Editions. Whether this was a factor in my favor or not, after failing with the above suggestions, I then installed the update and yet still could not use the previously suggested measures. Nonetheless, the firmware update is installed.
    I continued to get the error message [unable to unmount].
    I used the Disk Utility PARTITION on my internal HD on the My Book, but I partitioned it with ONE partition, and chose the GUID table option.
    I then was able to format the drive to HPS+ (journaled) with the ERASE function.
    Best wishes.
    ________________________________
    One bum throwing a crumb to another.
     
  7. freddyvb macrumors newbie

    Joined:
    Dec 13, 2008
    #7

    Thanks, I had the same problem and this worked.
     
  8. bugsnelson macrumors newbie

    bugsnelson

    Joined:
    Dec 16, 2008
    #8
    Format WD MY BOOK HOME EDITION for Mac

    Good. Disk Utility would not allow me to use the ERASE function to re-format. That's why I used PARTITION with one partition with GUID with the journaled formatting. ERASE would then function, which indicated I had fixed the issue. I have since then formatted a second WD MY BOOK, this one an original ESSENTIAL EDITION and had success using the same process.
    Happy New Year, everyone!
     
  9. betototo macrumors newbie

    Joined:
    Mar 16, 2009
    #9
    same problem

    Hi i try all the suggestions and it still not working, actually i can see the hard drive on my desktop, but when i try to open it it looks like its empty

    please HELP!!!!!







     

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