I am Running OS X 10.5.1 On a Macbook Pro 3Gigs of RAM C2D. Lately I have noticed things were no longer running snappy and became down right slow and choppy. Like my Disk was bad. So I did a Diskutility Verify-Disk and I got the following output. Code: Verifying volume Macintosh HD Performing live verification. Checking Journaled HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Checking multi-linked files. Checking Catalog hierarchy. Checking Extended Attributes file. [COLOR="Red"]Invalid node structure Volume check failed. Error: Filesystem verify or repair failed. [/COLOR] I do not have a Repair Option.... Is there any way to repair this.... Rebooting into Single User Mode and FSCK (if so how do you get into Single User Mode) or something to run in the terminal. Or is the Disk Bad or the File System is just screwed up.