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From: ts@cup.portal.com (Tim W Smith)
Newsgroups: comp.periphs.scsi
Subject: Re: Using SCSI removeable HD on both PC and Mac
Message-ID: <41228@cup.portal.com>
Date: 13 Apr 91 07:56:39 GMT
References: <751@rocksanne.WRC.XEROX.COM>
Organization: The Portal System (TM)
Lines: 27

I've moved a Syquest drive back and forth between a Mac and a PC
with no problem, using different cartridges for each.

As far as parity goes, things are more complex than some of the
messages here have indicated.  Some messages have talked of
devices "using" parity.  It is better to talk of devices
generating parity and devices checking parity.

For example, when you remove the parity jumper on a Quantum
drive, the drive stops checking parity, but it always generates
parity.  There are three combinations that appear in practice:

	generate and check

	generate but don't check

	don't generate and don't check

(Has anyone seen a device that checks but does not generate parity?)

I don't have my references with me, so I can't be certain, but I
believe that the Mac falls into the "generate but don't check"
category.

						Tim Smith