I got a case for my 2.5" 20 gig drive from CompUSSR in the mac section so it matches my iBook but I can only get it to work in my PC, It is formatted Fat32 and it did work once in my mac but then never again I have tried reformatting and repartitioning the drive rebooting the ibook but nothing is working. I checked system profiler and it shows up as a usb storage device. How do I fix this?