I actually have a Mac Plus and 80 MB SCSI Hard Drive ... it is extremely slow for some reason. It takes a minute just to send a simple page.

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Plus: SCSI port throughput is 312kb/s (bits, not Bytes). HDD interleave factor was 3:1.

SE: SCSI throughput is 656kb/s. Interleave was 2:1.

Mac II: SCSI throughput is 1250kb/s. Interleave was 1:1.

With newer and faster HDDs the interleave fades in importance. You can't easily do much about the port speed except to make sure that the HDD can keep up with it.

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