Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!sharkey!edsews!uunet!skivs!dr
From: dr@skivs.UUCP (David Robins)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Seagate ST-251-1 heads banging?
Message-ID: <2766@skivs.UUCP>
Date: 4 Feb 89 21:58:08 GMT
References: <5060049@hpccc.HP.COM>
Reply-To: dr@skivs.UUCP (David Robins)
Organization: Smith-Kettlewell Eye Research Institute, San Francisco, CA
Lines: 20

I have been using a Seagate 277R (RLL coding) 65 Meg. drive with abn
Adaptec 2372A card.  It is running under the standard FDISK partitions.

I have had the same head-banging on bootup access noise,
intermittently ever since the system was new.  It has been in service
about 5 months, without any problems.

I also thought it could be the lack of an optical track-0 sensor, too.
I am used to this on my Apple //e 5-1/4 floppy drives.  There is no
track-0 sensor, and the Apple Dos 3.3 is set to back-step 40 steps, if
it needs to calibrate, such as on first disk access, and if it has has
a certain number of read error trying to access a file.  Although it
uses 35 track drives, it takes 40 steps back, so you get between 5 and
40 chatters, depending on where the head started.  I thought all hard
disks used an IR sensor for this.
-- 
David Robins, M.D.  (ophthalmologist / electronics engineer)
The Smith-Kettlewell Institute of Visual Science,  ***  net:  uunet!skivs!dr
2232 Webster St, San Francisco CA 94115            ***  415/561-1705 (voice) 
The opinions expressed herein do not reflect the opinion of the Institute!