How to create a bootable drive from an external USB HD

Discussion in 'OS X and OS X Apps' started by johnj2803, Jan 29, 2008.

  1. johnj2803

    johnj2803 Active Member

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    I just read somewhere that you can actually boot from an external USB hard drive:

    1. Partition the drive Correctly

    for intel macs: make sure in the options you set the Partition Map Scheme to GUID Mode
    for PPC macs:make sure in the options you set the Partition Map Scheme to Apple partition Map

    Go to: Finder > Applications > Utilities > Disk Utility > select drive > partition > options

    2. Create a clone of your HD using Carbon copy cloner or super duper or something similar :D

    3. Reboot your mac and hold down the option key when the system is booting back up. This will let you choose your boot drive on startup. Choose your USB drive and continue. You’ll find that the system boots a lot slower, but that is expected of course. With any luck, your backup is an exact replica of your system.

    Just a question :D I already have an external drive partitioned, and it looks like the default setting chosen is partition as a master boot record (3rd option), if i re-partition my drive again to have a bootable external back up, will the data on my external drive get erased?

    I am still using Tiger 10.4.11

    NOTE: i have not personally tried this, I am willing to but I just have to make sure that my data will not be erased :D
     
    #1 johnj2803, Jan 29, 2008
    Last edited: Jan 29, 2008
  2. hannibal

    hannibal Guest

    there are already several existing threads on this topic. please use the search function next time. thanks.
     
  3. johnj2803

    johnj2803 Active Member

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    Oops sori boss :D Most of the threads were talking about intel mac kasi :D I still have the good old PPC :D
     
  4. hannibal

    hannibal Guest

    this thread talked about PPC based macs, and although the connection can also be firewire, USB external drives are formatted just the same. check it out.
     
  5. johnj2803

    johnj2803 Active Member

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    yup got it :D, i see that its the same procedure as i posted but it was still firewire. I never really knew you can boot from a USB (and from a PPC).

    Just to say that I do my SEARCH too I based my post from This thread that was unsuccessful in booting from a USB external drive with the notion that it is not possible :D even the links for the directions were not very helpful :D

    Anyway sorry for the redundancy ;)
     
    #5 johnj2803, Jan 29, 2008
    Last edited: Jan 29, 2008

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