umount /dev/hda4
umount /dev/hdc4
fsck -f /dev/hda4
fsck -f /dev/hdc4
mount -n -o ro /dev/hda4 /drive0
mount -n -o ro /dev/hdc4 /drive1

Unmount both music partitions, run fsck on them. By default fsck only checks the disk if it's marked dirty, or the mount count is reached, so -f forces a check.

You then answer yes to the questions it gives you.

Then you remount the disks readonly.
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-- roger