When using disk utility to verify/repair permissions (or verify/repair the disk itself), I've never been clear whether I should perform operations on the disk ("WDC WD1200BEVE-00WZT0" in my case) or on the volume nested beneath it ("MacintoshHD"), or both. I usually do both, but is this necessary?
Disk Utility: choose disk or volume
disk-utilitydisk-volumehard drive
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Best Answer
It can't hurt to repair permissions on your actual disk, but it is quite unnecessary, because "Macintosh HD" contains the actual operating system, so the stuff that you want to repair.