Can you try the following, and let me know what the results are?

umount /drive0
umount /drive1
umount /dev/hda4
umount /dev/hdc4

I just want to make certain you can cleanly unmount the filesystems. After this is done, simply reboot the player to return to a normal state or run the following to perform a disk check (might take an hour or so):

swapon /swapfile
fsck -fay /dev/hda4
fsck -fay /dev/hdc4
fsck -fay /