Sectors 411x probably aren't part of the music partition. hda4 is the big music partition but there are 4 others, one of which probably contain that sector. I'm not sure whether fdisk is on the empeg but it should tell you which partition has those sectors.

According to my fdisk, you're probably looking at hda5 which is the root partition. You can't fsck a mounted drive and I don't know how you can check it. Does someone else know?