[comp.periphs.scsi] Parity was Re: Using SCSI removeable HD on both PC and Mac

wcarroll@encore.com (Mr. New Dad) (04/19/91)

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!