The Mk1 empegs had 2 ide channels, so disks would be /dev/hda and /dev/hdc.
The Mk2 empegs only have 1 ide channel, so they are /dev/hda and /dev/hdc

However, the Mk2's have had the device node for /dev/hdc changed to point to what would normally be /dev/hdb. This enables Mark2 software to be consistent with Mark1 software..

But that shouldn't be the cause of your problem;

What does cat /etc/fstab reveal?