How do i boot from usb?

Discussion in 'iMac' started by X1Lightning, Jan 5, 2009.

  1. X1Lightning macrumors 6502

    X1Lightning

    Joined:
    Feb 19, 2007
    #1
    i used Carbon Copy Cloner to create a clone of my internal HD to an external usb hd, now if something happens and my internal drive gets corrupted how do i boot from the usb drive?
     
  2. drichards macrumors 6502a

    drichards

    Joined:
    Nov 30, 2008
    #2
    Hold option while booting, or alternatively, shift-command-option-delete.
     
  3. X1Lightning thread starter macrumors 6502

    X1Lightning

    Joined:
    Feb 19, 2007
  4. Zortrium macrumors 6502

    Joined:
    Jun 23, 2003
    #4
    Does this actually work? I was under the impression that you could boot from an external firewire drive only, not a USB drive.
     
  5. jim.lynch macrumors member

    Joined:
    Aug 27, 2008
  6. sickmacdoc macrumors 68020

    sickmacdoc

    Joined:
    Jun 14, 2008
    Location:
    New Hampshire
    #6
    The key to answering that is to ask whether or not you have an Intel based Mac. ;)

    Intel machines will boot fine from USB drives, assuming they are formatted as Mac OS Extended (Journaled) and have been prepared with a GUID partition map. Intel machines will also boot from FireWire drives- but again with the correct format/partition map.

    PowerPC Macs (although there are a couple of late model exceptions) will only boot from FireWire drives with a partition map type of APM (Apple Partition Map)- not GUID.
     
  7. dukebound85 macrumors P6

    dukebound85

    Joined:
    Jul 17, 2005
    Location:
    5045 feet above sea level
    #7
    Yes, Ive installed osx from a flash drive. Tons faster than dvd
     

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