External HDDs work with windows and not mac

Discussion in 'iMac' started by Lukepenks, Dec 18, 2012.

  1. Lukepenks macrumors newbie

    Dec 18, 2012
    Hi guys,
    This is my first post so bare wih me!

    A few days ago my mac started hanging on the GSOD, and nothing worked to fix it! I ended up formatting and starting over using the install disk.

    I finished formatting a few hours ago, but now none of my 4 external hdd's are working!
    The strange thing is that they do still work perfectly on my windows 7 laptop. They have worked on both windows and mac for the last year no problem, so I know it is not a formatting error (they're all exFat).

    Ive tried disk utility to repair, but the drive is greyed out. Ive also tried DiskWarrior which says it cannot repair the disk before I even try. The error I get on my mac is 'this computer was not able to read the disk' error, with options to eject and ignore.

    Any help would be hugelu appreciated!
  2. azentropy macrumors 68020


    Jul 19, 2002
    Which Mac OS X version did you reinstall? ExFat support I think was added around 10.6.5 - so if you installed an earlier version it might not have support.

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