Hidden "Boot OS X" partition, what does it do?

Discussion in 'OS X Mountain Lion (10.8)' started by kot, Oct 19, 2012.

  1. kot macrumors regular

    Sep 10, 2011

    What does this thing do? I cannot see it in the Finder and I'm wondering what it is for. Might it be some kind of malware disguising itself as a legitimate piece of OS X code.
  2. mrapplegate, Oct 19, 2012
    Last edited: Oct 19, 2012

    mrapplegate macrumors 68030

    Feb 26, 2011
    Cincinnati, OH
    It should be the recovery partition. Nothing to worry about.

    Wait, it's only 35MB, it can't be the recovery partition. I'm not sure now. I don't run BootCamp so I don't know how those look in Disk Utility. Do you use it? Is Boot OS X used to boot into Windows?
  3. GGJstudios macrumors Westmere


    May 16, 2008
    There is no Mac OS X malware in the wild that creates a separate partition. It is not a malware issue. It looks like either a partition was created, possibly for backup purposes, or the OS X Recovery partition was renamed. Have you looked at the contents to see what's there?
  4. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    You are not alone. It appears to be a new boot EFI partition on the Time Machine disk added with 10.8.2.

    Maybe Apple is getting ready to give up a true, bootable Time Machine disk?

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