Yeh – I’m crazy – I thought that reformatting my iPod to run as a PC firewire drive would be easy – no problems. This was done on more than just a whim – I needed to get a 700+MB file from said PC without a CD burner. Of course – I was wrong. Although the format worked fine, the iPod then refused to reboot in “music” mode, even after reformatting back to HFS+ (the iPods native format).
Thankfully this page provided the answer. Phew!