SCSI, it's not always fun!!
if the scsi-card is working, it should detect your writer, at least as a scsi-cdrom. So there are some things that can go wrong with scsi:
first. you have not terminated the scsi-bus (last physical device on the scsi-cable should be terminated -> read manual of device to see how to set the termination)
second, every scsi-device should have a unique scsi-id. Maybe the scsi-id of your writer is conflicting with another device.
how to check everything:
when your computer starts up, you will get a message from adaptec about your scsi-card. It will detect all scsi-devices attached to your card. If it is not detected here, W2K will never find it...
Then check termination and scsi-id's