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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?

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up vote 1 down vote accepted

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.

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Would repairing permissions on the actual disk also cover everything on "MachintoshHD", or would I want to also run a repair on that specifically? I imagine a repair on the disk would include the volume in its scope, but I don't know if that's actually how it works. – ivan Oct 9 '12 at 19:14
No, your "Macintosh HD" volume won't be repaired if you click repair on the actual disk. In the Unix world, people usually have a lot of volumes, so everything is always quite specific in matters like this one. – rien333 Oct 9 '12 at 19:18
Good to know. Thanks. – ivan Oct 10 '12 at 3:27

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