The light on the front is amber instead of green, it's not reflecting the name I gave it on My Computer, and it doesn't seem to think it has any data on it.
ALL of my music files were on there, among many other things.
EDIT: Oh, it's also saying the drive's not formatted. Just fucking spiffy.
EDIT #2: I've been talking with roolet, and she seems to think the Index table for the drive got b0rked. I'm running some Data Recovery tools as we speak...er, type.