I have a computer that came with a 68 pin scsi drive, pci adaptec scsi controller card, no other hard drives. I bought an 80 pin scsi drive that came out of a hot swap device. I want to install it to have both drives running but I cant get my computer to recognize the new drive in scsi disk utility.
I had to purchase an adapter to even be able to plug this drive in (the adapter is 80 pin to 68 or 50 pin with 8 jumpers), but i still cant get the drive to be recognized, i've tried everything. Help, anybody!!

does the bios see it at all or are you only looking in the os? Was this added after the os was installed or before? If you are trying to isntall windows with this, make sure you click the F6 in the beginning you you can specify the make/model

I already have an OS. I have been entering setup and running the disk utility to scan for scsi devices, but nothing is detected except my host adapter card. I unplugged the main scsi drive and tried that as well. The adapter that i've got the new drive plugged into has jumpers, and i've tried various connections on it, but nothing seems to work. Is this an issue with my adapter card? or maybe the 80 pin hot swap drive needs some sort of other device to plug into the scsi chain? I read up on the drive and it does not support on board termination, but it is LVD/SE 3.5 series quantum drive, same as the other drive I have installed but 80 pin instead of 68 and 9.1 GB instead of 18 GB. THANKS

I run many 68pin and 80pin scsi drives with no problems. The 80pin thru the adapter must have a unique ID# and on the same bus as your other scsi drive. It won't work on another chain by itself since it won't self terminate. The host card should be set to ID#7 your original scsi drive should be ID#0 if your booting to this drive, or ID#1 if not booting. It can be ID#0 if you disable the boot bios on your scsi control card. Try putting one jumper only on the 80pin to 68pin in the second jumper pair from the bottom. This is normally marked ID1, but infact will make the drive ID#2. Make damn sure that you have an active terminator on the end of your ribbon after both drives. email if you have more questions, but supply all info on your scsi setup.