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  1. #1

    Member Since
    Jan 25, 2008
    How do I boot from an external hard drive?
    Hi all,

    I managed to install Windows XP sp2 on a 50 gig partition on a 200 gig external hdd that is connected to my MacBook Pro via USB 2.0. When I plug the drive in, OS X (leopard) mounts it (it is called Untitled).

    I went to System Preferences and went to Startup Disk, but my external drive does not appear as an option. Why is this?

    Also, I know on a PC, before windows boots I can go into the BIOS and change the boot device. In OS X, is there a key combination I can press to allow me to choose to boot from my external drive?


  2. #2

    skaheadpunk's Avatar
    Member Since
    Jan 12, 2008
    Leicester, England
    MacBook, iPod Classic, 8GB 3G iPhone, Time Capsule
    I think you need to press the option key on start up to select the boot drive, though I'm not sure that XP will boot from an external.

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    As stated by skaheadpunk, Windows will not boot from an external hard drive. Macs currently do not use a BIOS, instead the system is controlled by EFI. In order to boot Windows XP or Vista from an Intel Mac, it must be installed on a separate partition located on the internal hard drive.


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