6.2 and SCSI (sorry but...)

I still have a problem.
I own a TEKRAM DC390U2W.
6.2 starts from an IDE hd.
enumerator start a ncr8 scsi driver.
There is no problem for cd-roms connected to scsiII connector but when I
plug the scsi hd on the ultra wide connector, the scsi driver freezes.

Any Idea?