USB Flash Drive - DOS Boot

Discussion in 'Windows, Linux & Others on the Mac' started by peskaa, Jun 17, 2009.

  1. peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #1
    I'm attempting to create a USB flash drive boot disk for DOS in order to get my mac pro running DOS to flash my graphics card. However, nothing seems to be working.

    I'm currently using HP's flash disk utility to do the formatting/creation of the boot disk, and have tried FreeDOS (ODIN) and several other flavours of DOS to try and get this working (all this is done in Vista64) - the stick seems to work fine according to HP's utility, and when booted into OS X I can see command.com etc as I should. Essentially, I don't see why it isn't working.

    What isn't working is actual boot. OS X and Vista don't see the USB drive as an option in Startup Disk, and holding down at boot simply displays my OS X and Vista installs.

    Anybody with ideas? I'm totally stumped.
     
  2. Stridder44 macrumors 68040

    Stridder44

    Joined:
    Mar 24, 2003
    Location:
    California
    #2

    I don't think EFI currently supports flash drive boot, as it's also next to impossible to boot off a flash drive to install Windows. My guess is this is the same for DOS.
     
  3. peskaa thread starter macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #3
    Hm. EFI does support USB boot, however it has to be off a GUID HFS+ partition - ie: not a DOS MBR. Got to use a CD :(
     
  4. Stridder44 macrumors 68040

    Stridder44

    Joined:
    Mar 24, 2003
    Location:
    California
    #4
    Ah, well there you go. Hopefully this will change in the future (I'm looking at you Apple).
     
  5. adolfox macrumors newbie

    Joined:
    Dec 17, 2010
    #5
    Very helpful answer. Thanks.
     
  6. Tech-Minded macrumors regular

    Joined:
    Jan 30, 2010
    #6
    just install rEFIt and boot the USB from there.
     

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