Help with booting Mac from USB drive

Discussion in 'Mac Basics and Help' started by Sadida, Dec 28, 2011.

  1. Sadida macrumors newbie

    Sep 14, 2011
    I don't have the install disc anymore (have no clue what I did with it), but I want to restore my mac to factory because I'm selling it. I formatted my external HD to exFAT today and placed the OSX Lion file from the App Store on there. If I erased everything on my internal HD through Disk Utility, would it be possible to install the factory stuff from my exFAT formatted external HD?
  2. balamw Moderator


    Staff Member

    Aug 16, 2005
    New England

    Most Macs will only boot from HFS+ formatted volumes over USB.

    You can create such volume from the download, but you need to still have OS X installed and need to wipe at least part of the external drive.


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