Isn't the external USB 2.0 backwards compatible with USB 1.x? Later PMG4s, the last of the OS9-bootables, could install Classic *only* after OSX, so it seems there's no universal rule. On Thu, 2 Mar 2006, vwmai wrote: . . . > the startup (user files, os 10.3.9, apps) on the G4 backed up using CCC > on an external USB 2.0 drive. The iBook is USB 1.2 so that's a no go. . . . > Back in the OS 10.0 and 10.1 days it seems like you had to have 9.2 on > the drive before you could install 10.x. If you didn't you were . . .