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I'm trying to figure out where my missing hard disk space is going. I'm using du and df from the command line and there seems to be a clear discrepancy.

So here's the du output:

$ sudo du -h -d 1 /
 59M    /.DocumentRevisions-V100
1.9M    /.fseventsd
  0B    /.PKInstallSandboxManager
1.6G    /.Spotlight-V100
  0B    /.Trashes
  0B    /.vol
 20G    /Applications
2.6M    /bin
  0B    /cores
5.0K    /dev
1.0K    /home
4.6G    /Library
1.0K    /net
  0B    /Network
 78M    /opt
7.2G    /private
1020K   /sbin
 11G    /System
264G    /Users
1.7G    /usr
4.0K    /Volumes
310G    /

Now here's the df output:

$ df -h
Filesystem      Size   Used  Avail Capacity   iused    ifree %iused  Mounted on
/dev/disk1     465Gi  417Gi   48Gi    90% 109334564 12511744   90%   /
devfs          213Ki  213Ki    0Bi   100%       737        0  100%   /dev
map -hosts       0Bi    0Bi    0Bi   100%         0        0  100%   /net
map auto_home    0Bi    0Bi    0Bi   100%         0        0  100%   /home

df is showing me 417gb used and du is showing 310gb used. How do I find the 100 missing gigabytes?

I'm running OS X 10.9.5 on a 2013 512gb MacBook Air.

  • If the system hasn't been rebooted for a while, I would do this first and run du/df again. – nohillside Jan 29 '15 at 21:19
  • 3 thoughts: Have you tried disk utility > verify and repair disk? Have you tried a GUI analyzer like disk inventory x (derlien.com)? Have you tried including the -r flag ("Generate messages about directories that cannot be read"). See 'man du' – y3sh Jan 29 '15 at 21:49
  • the -r flag is the default according to my man du. I've rebooted just a few hours ago. I'll run the disk verification. – Brent Jan 29 '15 at 22:28

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