MacBook not booting from external Hard Drive.

Discussion in 'MacBook' started by chrisvince, Sep 27, 2009.

  1. chrisvince macrumors newbie

    Joined:
    Sep 27, 2009
    #1
    Hi,

    I have a Black Macbook with 2GB ram, 250GB HDD, 2.4GHz Processor and have been trying to boot off of my 320GB firewire External HDD but it has so far been unsuccessful.

    I have the external formatted as GUID Partition Table, and have the four system disk folders on the drive (Applications, Library, System, Users) which I copied from a time machine backup.

    I have tried booting the MB while holding down the option key and the external HDD appears as a drive available for booting on. But when I select the external HDD a cross with a circle around it appears and it boots off the internal HDD instead of the external HDD.

    Is there anything I'm doing wrong???

    Thanks
     
  2. Mitthrawnuruodo Moderator emeritus

    Mitthrawnuruodo

    Joined:
    Mar 10, 2004
    Location:
    Bergen, Norway
    #2
    Copying over the System folders won't work, there are lots of hidden folders that won't be transferred using a normal Finder drag and drop. You might get around this, but it's probably more hassle than it's worth...

    You should either install OS X on the external from an installer disk or use a cloning tool like SuperDuper! to make a clone of a (working) Mac OS X boot disk.
     
  3. Thiol macrumors 6502a

    Thiol

    Joined:
    Jan 26, 2008
    #3
    I'm a big fan of using the Restore function in Disk Utility. This will also generate a bootable clone of your drive to the external. SuperDuper and CCC exclude some files from the cloning, so I feel more comfortable with Disk Utility. The trade off is that Disk Utility takes longer...
     

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