Hi,
only with 'SCSI 1' hdd you can add an another peripheral on this card due to a bios card limitation !
It happened the same to me.
The CDRW could only be seen with the old Quantum 80 Mb SCSI1 hdd. When I replaced it by any SCSI2 hdd the CDRW could not be seen any more.
We need a bios upgrade, and there is some on Ebay that are selling these :-D .