Bill, With Jaguar, if you start in Safe Mode (Shift boot) First Aid automatically runs at start up. However, the advantage of Single-User Mode is the ability to run fsck -y more than once. Other than that, it's the same routine. Brian Conner -----Original Message----- From: Power Macintosh G4 List [mailto:G4 at lists.themacintoshguy.com] On Behalf Of Seilnacht, Bill (OTS-WSP) Sent: Tuesday, June 10, 2003 9:59 AM To: Power Macintosh G4 List Subject: Re: [G4] Catalog B-tree damaged ? I removed Norton from my computers within the facility I work in and my personal machines for the exact same reason. Norton came up with all these errors that Disk First Aid didn't find. Try this: Boot in single users mode (hold down command key and the S) type fsck -y and see if it comes up with any problems. If, it says changes were made continue to run fsck -y until it comes up with no changes were made. Then type reboot. This command is the Unix version of Disk First Aid. You mentioned Drive 10, that is an excellent application and may solve your problem as well. I would first run the command I stated above , then see what happens. Also, you may want to look into Unix tools to help with disk issues. Try Developer Depot www.devdepot.com type Unix Utilities for OS X it should come up with some software that may help not only with disk issues but command line, printer,etc.