I never expected the SCSI bus to be very fast, I was just thinking that since it was rated at 10MB/sec that I'd get something closer to 8MB/sec on my SCSI HD. That's why I suggested that maybe the bus as a whole is CAPABLE of 10MB/sec, but it won't let me get anywhere near there unless I have two drives on the same bus and write to them at the same time. So maybe 4-5MB/sec per drive is the norm. I wouldn't know since my 9600 is the only older Mac that I have.