In particular, it should prevent calculating or reporting disk-usage for any external drives, secondary partitions, mounted disk-images, etc. This should prevent 'du' from crossing into any other mounted file-systems. Wuala 5.0Gi 0Bi 5.0Gi 0% /Volumes/WualaDriveFirst, the posted 'du' command has the -x option. Basically, 'df' and 'du' look at different things to arrive at their results.įilesystem Size Used Avail Capacity Mounted on The result is that counting blocks assigned to files ('du') adds up to a different number than the totals stored for free-space ('df'). Safety first, unless you don't value your data.įor the file-system savvy, it's possible to have unused blocks that aren't in any file, nor are they correctly represented in the free-space pool. Or the cause may have been a one-time event that won't recur. Or the cause may be a slowly failing disk drive that SMART Status doesn't detect. The reason for doing a backup is that the cause of the errors may be a damaged file-system structure that leads to further file problems. And unless you're experienced in interpreting disk errors, you might want to postpone that until after confirming the findings here. If it finds any errors, you may want to do a "Repair Disk", but only do this AFTER doing a backup. When it finishes, copy and paste the output in a post here. (Note: "Verify Disk", not "Verify Permissions".) Select your startup disk, then click "Verify Disk". Run Disk Utility.app (it's in Utilities).
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