And I am under the impression that the utility cannot repair a disk you are booting from.

This should only be done in cases when you cant use the Disk Utility to perform the repair.

One of the actions a safe boot does is to do some disk maintenance, and it may take care of your disk repair.

Disk Cleaner 10.6.8 Mac You Can

If that doesnt do it, if you have another mac you can attach via a firewire cable, you can reboot your iMac holding the T key down, then, with the iMac in target disk mode, you can run the disk repair from the other mac on the iMacs hard drive.

Have verified permissions, and run maintenance scripts on Onyx, no change yet.

Disk Cleaner 10.6.8 Free Less Than

Do you have at least 5GB or better 10 to 15 of the hard drive free Less than that can really crimp system performance.

After you get your hard drive in order, you might look this performance FAQ over.

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Disk Cleaner For Mac Os X 10.6.8