We will need more info.
In knoppix, at the command line:
# dmesg | grep ide
# cat /etc/fstab

This will display how the system is detecting the hardware on the IDE chain and will also let us know how the system mounts the various filesystems.

Also look here http://www.knoppix.net/forum/viewtopic.php?t=12244 for a similar situation.
Thanks,
James