how to format external hd after you use it in the time machine ?

Discussion in 'macOS' started by Luigi Ventura, Apr 3, 2012.

  1. Luigi Ventura, Apr 3, 2012
    Last edited: Apr 3, 2012

    Luigi Ventura macrumors newbie

    Apr 3, 2012
    installed my 500gb external hard drive (model WD External Media 5000BEV) to use it in the time machine on my macbook pro with mac osx system. Now I dont want the time machine anymore, i want to format it to use it at work. and the system complains: Could not unmount the disk . I've tried almost everything, I do not know what else to do. thanks in advance .
  2. ScoobyMcDoo macrumors 65816

    Nov 26, 2007
    Austin, TX
    If you tell us what "everything" is, it would be helpful.

    But just in case this is not part of "everything", did you turn off time machine?

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