I'm also having problems installing Win2K on my system with the same SCSI card (AIC-7850).
I have a tape drive with SCSI ID 0 and the Sony CDU926S CDR with SCSI ID 4 on this card.
I get so far into the install and then I get a message that "Windows 2000 cannot find a SCSI CD ROM drive" and the only choice I'm given is to exit setup.
My current system has 4 IDE Hard Drives, 2 on each IDE controller. One pair is Primary Master and Slave, the other is Secondary Master and Slave. I'm trying to load Win2K on the Secondary slave drive.
I've already got Win98 on the system and everything works fine.
Any ideas?