On Thursday, July 10, 2003, at 08:30 PM, Vintage Macs wrote:
Just a few general points. Lots of newer big SCSI drives on the market at the moment were previously installed in servers rather than as boot disks in desktop computers. You therefore need to pay attention to the jumpers (which will often be the smaller 2 mm size rather than 1/10 inch) before using it with a Mac. Ensure that you have selected a sensible SCSI address, that termination is on if the drive is going to be used internally and that auto motor start is ON (it's often OFF on disks that have been used in servers and Unix workstations). If the drive is to be used in an external case, SCSI termination should be off if you intend using an external terminator. Terminator power is a very different option to SCSI termination. Some older systems (eg Mac Plus, Apple II SCSI cards) do not supply termination power so you may need to enable it on the drive. In theory there should not be any problems if more than one device in the chain has terminator power enabled.
All of the recent hard disk manufacturers have a presence on the internet -- even those who have been bought out by other companies -- so go to their site and print out the spec sheet for your drive now. The specs for older disks may not be available in the future so it's worth grabbing a copy now, just in case.
Ideally, if a drive is destined for use on a vintage Mac, you should format the drive on a vintage Mac too. A good starting point on SCSI formatting and disk interleaves can be found at http://www.lowendmac.com/tech/scsi.shtml.
Phil
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"Most engineering products can be readily adapted to suit their originally intended purpose" -- C H Thornycroft
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