I just purchased a 500gb WD mybook. It's formatted with FAT32. I first plugged it into my pc (running XP) to backup my music and pictures. All went well. Next was to backup my macbook running leopard. Time Machine needed to "erase" i'm guessing format the drive before it could begin. No problem, i'll just backup the PC again. So here's the problem. The PC no longer recognizes the drive in Mycomputer. The drive does show up in the device manager just not anywhere else. I restarted the PC, un-installed and re-installed the drivers... no joy. Should i re-format the drive with my macbook?? Cliffs: FAT32 drive works with macbook not PC.