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  1. #1

    tewatson's Avatar
    Member Since
    Sep 27, 2008
    Location
    SoCal
    Posts
    34
    Specs:
    iMac C2D 2.66, MBP i5 2.4, MB C2D 2.4, iPad2 32GB 3G
    iMac can't boot from FW external HDD
    The only thing that shows up when booting with the Option key held is the Macintosh HDD. This is using the FW800 port and a bootable WD My Studio drive, using a disk backup made with SuperDuper. Identical setup works on my new MacBook Pro.

    Can't find any setting that might be inhibiting an external drive boot.

    Tom

  2. #2

    Collin Bl's Avatar
    Member Since
    Apr 07, 2009
    Location
    Napier NZ
    Posts
    3,298
    Specs:
    27 iMac i5, MBP 13 & iMac 20, 2TB dual TC, AppleTV, iPh4S
    With iMac running - can Superduper still see the Ext HD? if not run disk Utility and does the HD show up there?
    Try swapping cable end for end or another cable (FW400) if u have one.

  3. #3

    tewatson's Avatar
    Member Since
    Sep 27, 2008
    Location
    SoCal
    Posts
    34
    Specs:
    iMac C2D 2.66, MBP i5 2.4, MB C2D 2.4, iPad2 32GB 3G
    Yep, drive still works fine otherwise. Just want to make sure there is not a system setting that can preclude the drive from being used as a boot drive.

    Tom

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,102
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    As a test, see if you can boot with the drive attached to your USB port. There may be a problem with the FW 800 port on the iMac.

    Regards.

  5. #5

    tewatson's Avatar
    Member Since
    Sep 27, 2008
    Location
    SoCal
    Posts
    34
    Specs:
    iMac C2D 2.66, MBP i5 2.4, MB C2D 2.4, iPad2 32GB 3G
    Update - switching the cable around end-for-end did it. Boots fine. Thanks for the help troubleshooting.

    Tom

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