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  1. #1


    Member Since
    Mar 25, 2008
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    external hard drive
    I have it formatted in Mac OS extended(journaled) and its partitioned as GUID. Even with that done I still can't boot up using it. It doesn't show when i start up holding down option key. So my question is can you a USB external drive to boot from?

  2. #2

    Kash's Avatar
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    I believe you can only boot from Firewire external hard drives, not USB.

    June 2007
    July 2009

  3. #3


    Member Since
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    Specs:
    PowerBook G4 15 inch 1.5 GHz, iMac
    You can boot from USB disks if you happen to have an Intel Mac.

  4. #4

    Kash's Avatar
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    Oh really? Hadn't heard about that. Care to point me toward a guide to doing so?

    June 2007
    July 2009

  5. #5


    Member Since
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    Specs:
    PowerBook G4 15 inch 1.5 GHz, iMac
    Link to TUAW.

    I've done this myself, and it's the same as FW, just select it at the boot menu

  6. #6


    Member Since
    Mar 25, 2008
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    I got it to work. I had to put the generic OS X on the external. I was trying to do something with the Air and trying to use its install disc but it doesn't have firewire and I couldn't get the disc to install on other Mac's.

  7. #7

    Kash's Avatar
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    Black Macbook C2D 2GHz 3GB RAM 250GB HD iPhone 4 iPad 3G
    Quote Originally Posted by iRye View Post
    Link to TUAW.

    I've done this myself, and it's the same as FW, just select it at the boot menu
    Very nice. I'll be sure to keep that guide in mind if I ever need to use it.

    +virtual rep to you sir!!

    June 2007
    July 2009

  8. #8

    harryb2448's Avatar
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    Nov 28, 2007
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    Nambucca Heads Australia
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    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    To get the external HDD to boot it is necessary to format in Apple Partition Map. Connect the drive and when it appears on the desktop you will have to use Disk Utility to make it Apple Partition Map and not OS Extended.

    After backing up your system using utility such as SuperDuper, it is the best, the disk should appear in Startup Disks in the System Preferences. You can then boot from USB2 Intel and Firewire PPC.

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