


Go back and umount the right thing and repeat this step. If you umounted the wrong thing, it will complain that you can't repair a mounted drive. Type umount /dev/disk0s2, replacing disk0s2 with whatever disk your OS lives on.Type df and look for the drive that has your Mac system mounted-you'll have to unmount this.The installer will load up, go to Utilities in the menu and run Terminal.Boot off the OS X CD (reboot, hold C while booting).Knowing that OS X is built on Unix gave me a few clues on how to proceed. I searched the web and Apple's site, and couldn't find anything useful except to buy DiskWarrior or reformat the drive. Just recently I ran into a problem when I tried to Verify my hard disk and when it tried to verify the catalog, it responded "Invalid sibling link." Repair Disk didn't work.
