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From: bfag@ur-tut.UUCP (Meneldur)
Newsgroups: comp.sys.ibm.pc
Subject: Re: AT disk type
Message-ID: <180@ur-tut.UUCP>
Date: Sun, 4-Oct-87 10:14:04 EDT
Article-I.D.: ur-tut.180
Posted: Sun Oct  4 10:14:04 1987
Date-Received: Wed, 7-Oct-87 05:37:42 EDT
References: <2955@whuts.UUCP> <6423@ut-ngp.UUCP>
Reply-To: bfag@tut.cc.rochester.edu.UUCP (Meneldur)
Organization: Univ. of Rochester Computing Center
Lines: 30
Keywords: AT Drive table Seagate 4051

>In article <2955@whuts.UUCP> 2212msr@whuts.UUCP (ROBIN) writes:
>>Could someone in NETLAND please  tell me how to define a type 15 drive on an
>>early IBM AT?  I've got a Seagate 4051, currently configured as a type 11, but
>>that wastes about 4-5Mbytes.  If someone could supply code to write to table that would be even better.

While I am not intimately familiar with the IBM AT, per se, I do run a Heath
H-248 AT clone with which I had a similar problem.  While the list of recognized
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
AT I had NO hard drive at all.  I booted up with no disk in A: and behold!  I
began to hear the familiar chatter of the QUANTUM's heads as the system came
up.  It was definitely music to my ears!

One other point of interest: I discovered the drives were MUCH slower on the
AT than the XT.  I had to go back and perform a low level format on both  
drives, raising their interleave factor from 3 to 4.  I've had no problems
ever since.

I do not know that this will be of any assistance to you in your problem, but
perhaps it may prove of some help to others.

Bill Faggart
Dept. of Geological Sciences 
University of Rochester
Rochester, New York 14627