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From: andys@genesis.UUCP (a.b.sherman)
Newsgroups: comp.sys.att
Subject: Re: info on 7300 disk drives
Message-ID: <337@genesis.UUCP>
Date: Tue, 26-May-87 12:58:56 EDT
Article-I.D.: genesis.337
Posted: Tue May 26 12:58:56 1987
Date-Received: Thu, 28-May-87 03:42:09 EDT
References: <6485@mhuxu.UUCP> <1390@hou2d.UUCP> <506@unisec.usi.com> <856@kodak.UUCP>
Organization: AT&T Bell Laboratories, Middletown, NJ
Lines: 35
Keywords: 7300 drives
Summary: SCSI is NOT the same as ST506

In article <856@kodak.UUCP>, hill@kodak.UUCP writes:
> In article <1750@ihlpe.ATT.COM> psfales@ihlpe.ATT.COM (Peter Fales) writes:
> > WRONG!!  Sorry to flame, but I would hate to see anyone go out and purchase
> >a SCSI drive.  The 7300 uses ST506 drives like those used on the 6300 and
> 
> WRONG again, the SASI and SCSI are acronyms that the drive companies give to
> their standard ST506 interfaces! If a drive is a SASI it IS a ST506.  Please
> check out your facts before making generalized statements about winchester
> drives. I have been installing SASI and SCSI drives in the 7300 and 3B1 for
> over a year now.
> 
> 
> SASI stands for Sugart Associates Standard Interface  which the other 
> companies didnt like so they renamed it to SCSI which means Small Computer
> Standard Interface.  They are both the same and both ST506, which some other
> companies call ST412.


It is true that SCSI and SASI are virtually the same thing.  Notice
I say virtually.  Since SCSI is a later spec, it has some more bells
and whistles and higher performance than SASI.  Neither of these
beasts is the same as ST506.  In order to run an ST506 drive from a
SASI or SCSI host adapter, you need a bridge controller.  These are
usually in the same form factor as a 5.24" drive and attached directly
to the drive chassis.  This makes the bridge controller seem
transparent to the user, but its price is not.  The UNIX-PC most
emphatically does NOT repeat NOT have a SCSI host adapter in it. 
Rumors to the effect that a SCSI controller would be coming out for
the UNIX-PC stirred a lot of excitement for the 24 hours it took to
kill them.
-- 
andy sherman / at&t bell laboratories (medical diagnostic systems)
room 2h-097 / 480 red hill road / middletown, nj 07748
(201) 615-5708 / andys@shlepper.ATT.COM
...The views and opinions are my own.  Who else would want them?