Volume Erase Failed / Couldn't Unmount Disk

Discussion in 'MacBook Pro' started by idyll, Mar 26, 2015.

  1. idyll macrumors 6502

    Jun 5, 2007
    Trying to erase a hard drive in a MacBook Pro so that I can re-install Yosemite but receive a "Volume Erase Failed" and "Couldn't Unmount Disk." I am booting from a USB drive with Yosemite on it, not from the internal hard drive.

    I also took the hard drive out, connected it to my iMac, and tried to erase it that way. I don't get the same message, but the erase does seem to take abnormally long and get stuck half way. Then it seems to finish but the disk never gets renamed.

    Is the hard drive finished and do I need to buy a new one?
  2. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    That does kinda sound like a bad drive. What symptoms were you having leading up to this? What does it say if you try a verify disk in Disk Utility?

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