Is a Seagate Cheetah 18 GB LVD Ultra SCSI 2 10K RPM drive fully compatible and useable as-is (no special controller) on an 8500 or 9500 Powermac?
Yes.
I have an SCA 68 to 50 pin adapter to connect to the existing SCSI chain. I thought of leaving the existing original 1 GB drive as a back-up boot drive but something tells me this might complicate matters or slow down the new drive or the bus because of it's older technology.
If the existing drive is SCSI-1, then yes, having it on the internal Fast SCSI-2 bus will slow the new drive. OTOH, it depends on what you'll be doing with that drive. Unless you're doing video capture, I don't think you'll feel too much diff.
I bought it on Ebay and the seller said to set termination on the other items on the chain as the drive cannot be terminated, which I guess would be just the jumpers on the CD-ROM, and the original HD (if I keep it) to figure out.
ya. And most SCA adapters have termination pins too.
I always thought only the last item on the chain need be terminated?
Technically, both ends of a SCSI chain must be terminated. The end on the mother board is already terminated for you. You must terminate the last device.
Does the physical location where the item is connected along the SCSI ribbon determine the order irrespective of the device's SCSI ID? (Closest to Mobo connector is first, and continue as you go down along the ribbon from there?)
The SCSI ID is a "logical" unit number, used to address the drive in software. It has nothing to do with the drive's physical position on the chain. It is the device at the physical end of the chain that must be terminated.
The Seagate PDF manual I downloaded states that" termination power must be correctly supplied." What does this mean?
All older Power Mac systems provide internal SCSI termination power.
HTH, - Dan.
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