Formating external usb 2 drive

Discussion in 'macOS' started by mashinhead, Oct 13, 2006.

  1. mashinhead macrumors 68030

    Oct 7, 2003
    I'm trying to erase and reformat an external hd, i bought a new one for my macbook and this is the original hd from it i put in a new housing. when i try to format it in disk utility it gives me an error message that says it can't unmount the drive to erase it, any clues?
  2. jsw Moderator emeritus


    Mar 16, 2004
    Andover, MA
    Worst case? Reboot and all should be well. An application or file from that drive is probably in use.
  3. mashinhead thread starter macrumors 68030

    Oct 7, 2003

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