Startup with your install CD/DVD and format it from there. Paul Moortgat On 11 May 2006, at 07:41, Ron Michael wrote: > I'm trying to erase/reformat a Hitatchi 80gig hard drive in my > mirror door G4, 1.25mhz, which is not my primary system drive. I > had formatted it MS-DOS with the intention of taking it out and > making it an external drive for my laptop. I changed my mind. Now I > want to reformat it with Mac HFS. I tried using Disk Utility Erase > function and it won't let me. Says it can't unmount the drive. Any > suggestions? Any other program that might handle this for me. I've > got Disk Warrior and the drive won't show up there either. > Thanks. > Ron in Memphis