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From: wcarroll@encore.com (Mr. New Dad)
Newsgroups: comp.periphs.scsi
Subject: Parity was Re: Using SCSI removeable HD on both PC and Mac
Message-ID: <131072@jake.encore.com>
Date: 19 Apr 91 12:58:20 GMT
References: <41228@cup.portal.com>
Organization: Encore Computer Corp, Fort Lauderdale, FL
Lines: 28

From article <41228@cup.portal.com>, by ts@cup.portal.com (Tim W Smith):
> 
> 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

From SCSI-2 Working Draft Proposal Revision 10b, section 4.6 "SCSI Bus
Signals": "Data parity DB(P) shall be odd."

If your device does not generate parity then it does not conform to the
SCSI spec. Thus there are two combinations and they are:

	check

	don't check



-- 
William R. Carroll  (Encore Computer Corp., Ft. Lauderdale FL)
wcarroll@encore.com         uunet!gould!wcarroll
	Give us peace in our time!