Hey altamaiz,
I would check the pin assignments on the drive first. See if it is set as a slave. Change as needed.
Before making changes, is this a test box?
As for the MDK comparison, well, SME is a server appliance O/S. MDK is a desktop or server depends on how you install it. They run slightly different courses. The mainstream linux desktops spend a lot of effort getting the system to boot in many different scenarios. SME uses the shotgun effect: you want a great server, insert cd-rom, reboot computer----kaboom, you now have a server! All fun intended.
Joe
Edit: Sorry, the above should have said "jumper pin assignments".