Hidden Partitions

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

  1. macrumors member

    Joined:
    Jan 25, 2012
    #1
    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

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    The terminal diskutil list will do this
     
  3. thread starter macrumors member

    Joined:
    Jan 25, 2012
    #3
    But what should I write? what command?
    Is there a list of those commands?
     
  4. Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #4
    Type in from the terminal

    diskutil list

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

    Joined:
    Jan 25, 2012
    #5
    is it correct?
    209Mb EFI???
     

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  6. macrumors 603

    Joined:
    Aug 9, 2009
    #6
    It looks correct to me.

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

    w0lf

    Joined:
    Feb 16, 2013
    Location:
    USA
    #7
    I find it easier to enable debug mode in diskutility which then lets you show hidden partitions.

    Code:
    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. thread starter macrumors member

    Joined:
    Jan 25, 2012
    #8
    defaults write com.apple.DiskUtility DUDebugMenuEnabled 1

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

    Dalton63841

    Joined:
    Nov 27, 2010
    Location:
    SEMO, USA
    #9
    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. thread starter macrumors member

    Joined:
    Jan 25, 2012
    #10
    Thanks all for your help
     
  11. macrumors 68020

    Joined:
    Jun 15, 2012
    #11
    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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