"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 68040


    Sep 11, 2008
    New York City
    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:

  2. FNH15 macrumors 6502

    Apr 19, 2011
    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

    Jan 20, 2013
    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 G5


    Apr 3, 2014
    Hong Kong
    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

    Jan 8, 2012
    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 macrumors 601


    Jun 13, 2016
    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 68040


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

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6 September 28, 2016