Startup Disk 10.5 & 10.4

Discussion in 'macOS' started by albstern, Jul 6, 2009.

  1. albstern macrumors newbie

    Feb 21, 2008
    I hope someone can help me.

    [I just upgraded my 10 year old (!) G4 to a new iMac.]

    I have an external hard disk with a system folder 10.4.x (whatever the very newest update was.)

    I was planning on using that system with my new iMac (with 10.5.7).

    When I going to System Preferences>Start Up Disk.... it doesn't recognize the system folder in anyway.

    Is there something wrong or can I simply not do this from my new iMac???

    Thank you much.
  2. Guiyon macrumors 6502a

    Mar 19, 2008
    North Shore, MA
    Any PPC drive formatted pre-10.4.6 uses what is called the Apple Partition Map format. When Apple switched to the x86 architecture they switched their primary partitioning format to GPT. Booting from an APM-formatted drive is not support by any of Apple's tools (Installer, Startup Disk, etc) but the Intel machine should still be able to boot from it. Try holding down the Option key when restarting and see if the drive appears there.

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