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From: henkp@nikhefk.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: Faster PC Hard Disks
Message-ID: <139@nikhefk.UUCP>
Date: Wed, 15-Apr-87 12:50:24 EST
Article-I.D.: nikhefk.139
Posted: Wed Apr 15 12:50:24 1987
Date-Received: Fri, 17-Apr-87 03:13:39 EST
References: <859@oakhill.UUCP> <591@zaphod.UUCP> <2902@ecsvax.UUCP>
Reply-To: henkp@nikhefk.UUCP (Henk Peek)
Organization: Nikhef-K, Amsterdam (the Netherlands).
Lines: 19
Keywords: fast harddisk servotracs hardware

In article <2902@ecsvax.UUCP> mvolo@ecsvax.UUCP (Michael R. Volow) writes:
>Part of a response to a query about faster hard disks for an XT discusses

I use a fast HD (Microsience HH1050 40MB 28ms) in a M24 (= ATT6300).
It is very fast. Controller Adoptek 2070A with a interleave of 3.
Within a 33MB partition the average seektime is 20ms (PC labs bench-
mark coretest). I have never tested other interleave factors.

In the last weeks the servo loop of the HH1050 is not very stable
on a small group of tracs around trac 400. The servo pulse pattern
is repetive and looks ok. The processing of the servo-data is
very tricky. They are adding many signals to drive the voicecoil
amplifier. The drive is one of the first series. There are some
mods on the print with wirewrap wire. I have no "real technical"
documentation. Who knows more about this drive or about servo
trac processing. Please email direct. When there is more
interest and I will make a summery for the net.

Henk Peek, henkp@nikhefk.UUCP  ..!seimo!mcvax!nikhefk!henkp.UUCP