Hidden Partitions

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

  1. AuRe
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    macrumors member

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    #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. maflynn
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    maflynn

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  3. AuRe
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    thread starter macrumors member

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    #3
    But what should I write? what command?
    Is there a list of those commands?
     
  4. maflynn
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    maflynn

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    #4
    Type in from the terminal

    diskutil list

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

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    #5
    is it correct?
    209Mb EFI???
     

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  6. chown33
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    macrumors 604

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    #6
    It looks correct to me.

    209MB is about 0.2 GB, or 0.0002 TB.
     
  7. w0lf
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    macrumors 65816

    w0lf

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    #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. AuRe
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    thread starter macrumors member

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    #8
    defaults write com.apple.DiskUtility DUDebugMenuEnabled 1

    What is it for?
    Do I write in terminal?
     
  9. Dalton63841
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    macrumors 65816

    Dalton63841

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    #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. AuRe
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    thread starter macrumors member

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  11. benwiggy
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    macrumors 68020

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    #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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