cyliax@ecn.purdue.edu (Ingo Cyliax) (11/28/90)
Actually, SCSI-1 devices should continue to function on a SCSI-2 bus. It's just if you share a SCSI-2 bus with SCSI-1 and SCSI-2 devices, you may notice some performance loss. SCSI-1 is more or less a subset of SCSI-2. The ideas of synchronous transfers and disconnects as well as Wide-SCSI were around for a while, before SCSI-2 was even done. So what you really want to look for is a drive that will do synchronous transfers to be used with the NeXTStation for maximum performance. Note that even though the SCSI transfer rates can be very high, the transfer rate from the platter to the cache memory in the drive may not really be all that high. Besides, the setup time for a transfer, the interrupt latency and the seek times are orders of magnitude greater than the transfer times at transfer rates of 4Mb/s, and that's where you loose alot of time when doing random I/O as in a fileystem. -ingo -- /* Ingo Cyliax ECN, Electrical Engineering Bldg. * * cyliax@ecn.purdue.edu Purdue University, W. Lafayette,IN 47907 * * ing@cc.purdue.edu Work: (317) 494-9523 * * cyliax@pur-ee.UUCP Home: (317) 474-0031 */