Hmmm.....that's strange.

Do you use an onboard scsi controller or the 'real' thing ?
Does the controller has it's own bios ?
It has been a while since i used scsi under linux, but i do know that an onboard bios/firmware can cause you a lot of troubles....on the other hand Debian doen't seem to have a problem.....
You have a stange combination of components installed i must say

Try to change the scsi id of the harddisk.