This is a disk controller problem. With the right hardware and the right software you can generate 16 copies in under 5 minutes plus load and unload time.
You might want to look for a software package "disk juggler" and for a multi-channel SCSI controller.
I have a customer that duplicates for software houses. He paid 16K for the system. Got a case built like a "brick outhouse", a power supply that dims the lights in Atlanta when he turns it on, Plextor SCSI R/Ws, and a multi channel SCSI controller I have never seen anywhere else. But it was available at a couple of the national parts houses for around $300.
Ed Fair
Give the wrong symptoms, get the wrong solutions.