"System" Using Ridiculous Amount of Space (750GB)

Discussion in 'macOS Sierra (10.12)' started by penajmz, Sep 28, 2016.

  1. penajmz, Sep 28, 2016
    Last edited: Sep 28, 2016

    penajmz macrumors 68030

    penajmz

    Joined:
    Sep 11, 2008
    Location:
    New York City
    #1
    How can I find what this is?

    750GB that I have no idea what it is. It's driving me crazy right now.

    I found some files that were mysteriously duplicated by themselves..... Don't ask how because i have no idea. The this:

    disk.jpeg
    disk2.jpeg
     
  2. FNH15 macrumors regular

    Joined:
    Apr 19, 2011
    #2
    Boot into recovery and verify your disk. Then, check your user library and see if anything there is taking up an inordinate amount of space.
     
  3. mark-vdw, Sep 29, 2016
    Last edited: Sep 29, 2016

    mark-vdw macrumors regular

    Joined:
    Jan 20, 2013
    #3
    There's a few good tools out there that analyze disk space usage, like Disk Inventory X. They'll give you a better breakdown compared to what "About this Mac" offers.

    One thought: I seem to remember that files in the Trash are counted under "System".

    Taking it from another angle: There's not many file types that will fill up 750GB. Movie collections or massive photo libraries are the first that come to mind. If those are in an unusual location, the system may be counting them in the wrong category. Are you sure those are accounted for?
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    Sometime boot to safe mode and boot back to normal desktop can fix it (or part of it), because boot to safe mode will allow the system to remove all useless cache files, which may be >100GB after some time.
     
  5. cynics macrumors G4

    Joined:
    Jan 8, 2012
    #5
    For some reason the new 'about this mac' indicates my movies as system which is ~700gb.

    Is there a chance you are using that much space but it's just not being reported correctly?
     
  6. Feenician Suspended

    Feenician

    Joined:
    Jun 13, 2016
    #6
    The advice above about checking disk health and using a 3rd party application like DiskInventoryX (or my favorite free one, OmniDiskSweeper) is good and you should do that op. Once you've done those it's worth rebuilding spotlight for the disk too (add it then remove it from Spotlight privacy) as those classifiers are built from spotlight info and may simply be corrupt and misclassified.
     
  7. penajmz thread starter macrumors 68030

    penajmz

    Joined:
    Sep 11, 2008
    Location:
    New York City
    #7
    Thanks guys, went and got DiskInventoryX and found out it was Xcode simulators taking all that space.
     

Share This Page