Your primary music partition seeme to be sick. While it is usually caused by a hardware mallfunction, let's first suppose the culprit is an extreme case of yanking the power off while the disk tries to write.

As Mark suggests, try to load development SW, then follow directions for fscking in the FAQ. (Your situation is different, but the procedure outlined there still applies.)

Edit: It just occured to me: did you perhaps removed the power while empeg was in (seemingly endless) 'checking media' phase? This is a Bad Thing (TM). Anyway, after you ressurect your player, install Mark's Hijack kernek which has an option to skip those checks (unless they are *really* necessary).