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From: burton@parcvax.Xerox.COM (Philip M. Burton)
Newsgroups: comp.sys.ibm.pc
Subject: Re: AT disk type
Message-ID: <554@parcvax.Xerox.COM>
Date: Sun, 4-Oct-87 14:59:40 EDT
Article-I.D.: parcvax.554
Posted: Sun Oct  4 14:59:40 1987
Date-Received: Thu, 8-Oct-87 01:32:03 EDT
References: <2955@whuts.UUCP> <6423@ut-ngp.UUCP> <180@ur-tut.UUCP>
Reply-To: burton@parcvax.xerox.com.UUCP (Philip M. Burton)
Organization: Xerox PARC
Lines: 32

>drives was long, it certainly didn't recognize the pair of QUANTUM 2020s I had
>connected to the WD controller.  These are some old, big, 8-inch, 20M hard
>drives with 512 cylinders and 4 heads that I picked up for $50 each from a
>local surplus place.
>
>Anyway, while this odd drive setup worked fine in my old Heath H-158 XT, the
>AT disavowed any knowledge of them.  Finally, in my setup routine, I told the
>
>drives, raising their interleave factor from 3 to 4.  I've had no problems
>ever since.


Unless I've forgotten everything I once knew about disk drives, I thought
that Quantum 8" drives used the Shugart SA 1000 interface, which was quite
different that the ST506/412 interface.  Even the transfer rate was     
different, 4.34 Mb/sec for the 8" vs 5.0 Mb/sec for the 5 1/4".

How did you manage to get the Quantum's to work?  Did you use a stock 
controller??  Did you have to set a jumper?  Or, did you have a special
version of the Quantums which had the ST506 interface?

By the way, please be sure to tell netland how you used an outboard box
with a power supply with +24 volts (and -5 or -12V ??).

Just a friendly caveat to poor, starving grad students.



-- 
Philip Burton       burton@parcvax.xerox.COM   ...!hplabs!parcvax!burton
Xerox Corp.         preferred path: burton.osbunorth@xerox.COM
408 737 4635    ... the usual disclaimers apply ...