I got this message when trying to verify my OSX disk. It said I needed to back up and erase my disk so I installed Leopard again and ticked the option to transfer all my settings and docs and apps from time machine. I ran verify disk again (after the install) and the same message came up. Is it serious? What should I do? I am in the middle of a project which will be finished in 3 weeks. Thanks Performing live verification. Checking Journaled HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Incorrect block count for file _CACHE_003_ (It should be 0 instead of 69) Checking multi-linked files. Checking Catalog hierarchy. Checking Extended Attributes file. Checking volume bitmap. Checking volume information. The volume Macintosh HDD needs to be repaired. Error: Filesystem verify or repair failed.