My drive was formatted using Maxtor's dive utility thing on the driver CD in MacOS 9.0.4, and it was my primary drive which I was booting off of to keep my internal drive free and ready for X. I have MacOS 9.1 on it, and having it bootable like that may be why it works so easily in X, I don't know. I count myself lucky not to have the many problems facing so many other new X users. Booting into 9.1, then installing 9.1 on the Maxtor drive (with its own driver extensions installed, of course). Or do what I did-copy your system folder over to it. either way, make 9.1's Startup Disk see it as a valid startup disk. Make sure it works, then try starting up in X. See if that helps.