Volume shows (as start-up disk) but won't boot!

Discussion in 'macOS' started by dee dee, Sep 14, 2011.

  1. dee dee macrumors newbie

    Jul 9, 2008
    Hi folks,

    I'm trying to simply create a bootable disk using my external hard drive.

    I've used Superduper to create a backup (all files) onto my external hard drive: which has 2 partitions, both Mac OS Extended (Journaled).

    In System Prefs, Startup Disk - shows the same folder name (Mac OSX, 10.4.11, on Macintosh HD) on both my internal drive AND external drive...

    I've tried to choose the external drive (in System Prefs->Startup Disk) and press the restart button... no luck.
    I've tried holding down the "option" key at startup... no luck.

    Any ideas why I can't startup off the external hard drive despite it "being a valid boot disk"?

    I've scoured the net, these forums... apple, the Superduper support/help/faqs...

    I'm running OSX 10.4.11

    Thanks in advance folks...

  2. brijazz macrumors 6502


    Jul 31, 2008
    Is your disk formatted using the "GUID Partition Table"? That's necessary for your disk to be bootable, I believe. You can check in Disk Utility.
  3. dee dee thread starter macrumors newbie

    Jul 9, 2008
    Yes. thanks so much for the reply.

    Anyone else with any clues to this seemingly straightforward dilemma?

Share This Page