Thanks smoker, you've solved the puzzle. Apparently the empeg has /proc/ide/hdb, but the device to mount should be /dev/hdc4.
I understood from the empeg-guys there were some compatibility issues between MK1 and MK2.
Mk1 has /proc/ide/hda, /proc/ide/hdc, /dev/hda and /dev/hdc
MK2 has /proc/ide/hda, /proc/ide/hdb, dev/hda and /dev/hdc

Can anyone with a dual drive system verify this?

Frank van Gestel
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Frank van Gestel