Just got rMBP - why is so much disk space used by clean install of OS X?

Discussion in 'MacBook Pro' started by gwelmarten, Sep 14, 2012.

  1. gwelmarten, Sep 14, 2012
    Last edited: Sep 14, 2012

    gwelmarten macrumors 6502

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    Jan 17, 2011
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    England!
    #1
    Hi Guys
    So, I just took delivery of my Retina MacBook Pro. Just started playing with it and concerned that already 35GB of HDD space has disappeared!

    So, I looked in Macintosh HD and got this:
    Applications: 6.5GB
    Library: 3.9GB
    System: 5.4GB
    User Information: 49b
    Users: 2.1GB

    Which adds up to roughly 18GB.

    When I enable hidden folders / files, I get a folder called 'Private' appear. This is sized at 18.1 GB. Does anybody know what this is? Isn't all the OS X stuff in the System folder?

    Is Private just another place where I can find my other files? Like they are a special Alias as it's Unix? Why would a default install of OS X take up so much space?

    Sam

    UPDATE: See attachment for breakdown of usage.
     

    Attached Files:

  2. switon, Sep 14, 2012
    Last edited: Sep 22, 2012

    switon macrumors 6502a

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  3. ToddSoc macrumors newbie

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    #3
    Safe sleep eats up a ton of disk space, the amount of your memory plus a little bit extra.
     
  4. gwelmarten thread starter macrumors 6502

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    #4
    Hi
    Thanks for such a detailed response. I just wanted to check when you replied you read the bit about it taking 35GB - with 18GB being the private folder (and var), as you only referred to 18GB. So, altogether, once the computer has being used, put to sleep once and rebooted with nothing installed or changed since it was first started being used, 35GB of usage is acceptable?

    Sam

    ----------

    Yeah, using 16GB's of RAM so that's going to be partly responsible. Thanks.
     
  5. switon, Sep 14, 2012
    Last edited: Sep 22, 2012

    switon macrumors 6502a

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  6. Lord Appleseed macrumors 6502a

    Lord Appleseed

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    #6
    It could be the mobile backup. Mine was at 30 GB.
     
  7. switon, Sep 14, 2012
    Last edited: Sep 22, 2012

    switon macrumors 6502a

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  8. gwelmarten thread starter macrumors 6502

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    #8
    Mobile Backup as in the backup folder created by iTunes in Library that contains the backups of iOS devices? This computer is new - I have not plugged in any ioS devices, so I don't think this is the problem. Thanks anyway.

    ----------

    Hi
    So, I ran 'sudo ls -alh /private/var/vm'
    sleepimage is 16GB
    and swap file is 64MB.

    Should the swap file be larger?

    ----------

    Hi
    Now done this as well: 'sudo du -h /private/var'
    Only bits of interest are:
    Code:
     16G	/private/var/vm
     17G	/private/var
    Sam
     
  9. switon, Sep 14, 2012
    Last edited: Sep 22, 2012

    switon macrumors 6502a

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  10. Puevlo macrumors 6502a

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    #10
    The vast majority of Mac OS X is actually uncompiled code which is why it is so much bigger than you would expect. This allows Apple to push out updates and bug fixes far quicker than would normally be possible with compiled binary.
     
  11. gwelmarten thread starter macrumors 6502

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    England!
    #11
    Thank you so much for your reply. Now I feel much better! I will enjoy it - it's amazing. Just getting used to it to take it to University for a computer science degree.

    Thanks,

    Sam
     

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