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Hidden Partitions

Discussion in 'OS X Mountain Lion (10.8)' started by AuRe, Aug 4, 2013.

  1. macrumors member

    How do I list in terminal all the partitions in my hdd?
    In apple service gave me a command and I listed hdd partitions of 550Kb and 1mb but I didnt write it and I dont remember.
    Any one knows which is it?
  2. Moderator


    Staff Member

    The terminal diskutil list will do this
  3. macrumors member

    But what should I write? what command?
    Is there a list of those commands?
  4. Moderator


    Staff Member

    Type in from the terminal

    diskutil list

    That will give you a listing of your drives.
  5. macrumors member

    is it correct?
    209Mb EFI???

    Attached Files:

  6. macrumors 603

    It looks correct to me.

    209MB is about 0.2 GB, or 0.0002 TB.
  7. macrumors 65816


    I find it easier to enable debug mode in diskutility which then lets you show hidden partitions.

    defaults write com.apple.DiskUtility DUDebugMenuEnabled 1
    Also the 209MB EFI is necessary it's like the boot loader that interfaces your software and firmware/hardware. http://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
  8. macrumors member

    defaults write com.apple.DiskUtility DUDebugMenuEnabled 1

    What is it for?
    Do I write in terminal?
  9. macrumors 65816


    If you use that command in terminal, then Disk Utility app will show the hidden partitions.


    Actually the EFI partition is not absolutely necessary. The EFI partition != the actual EFI. You can restore a Mac partition to a fresh hard drive with MBR partition scheme and boot it on a Mac with no EFI partition. The EFI partition IS however used for certain things, for instance EFI firmware updates will fail without it.
  10. macrumors member

    Thanks all for your help
  11. macrumors 68020

    Yes. It is perfectly normal for your drive to have a number of other partitions: the EFI partition, the recovery partition and the "main" partition that you use.

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