Path: utzoo!utgpu!water!watmath!clyde!rjs@moss.ATT.COM
From: rjs@moss.ATT.COM
Newsgroups: comp.sys.ibm.pc
Subject: Re: Seagate ST-251 question
Message-ID: <33524@clyde.ATT.COM>
Date: 21 Sep 88 13:33:29 GMT
References: <251@fsc2086.UUCP> <16800373@clio>
Sender: nuucp@clyde.ATT.COM
Reply-To: rjs@moss.UUCP (Robert Snyder)
Organization: AT&T Bell Laboratories, Whippany NJ
Lines: 25

In article <16800373@clio> berger@clio.las.uiuc.edu writes:
>
>The ST-251 has 820 cylinders, 4 heads, and 17 sectors per track.
>It has a 40 ms access time with a 3-200 microsecond step pulse
>rate.
>
>			Mike Berger
>			Department of Statistics 
>			Science, Technology, and Society
>			University of Illinois 


A quick calculation will show that the above information cannot be correct.
4*820*17*512(sector size)=28,549,120 bytes, a bit short of the advertized
40M.  The ST-251 definintely has 6 heads and 17 sectors/track.  The number
815 sticks in my mind as the number of cylinders, but 820 may well be
correct.  (Actually, the 17 sectors/track is a property of the formatting
program, but is the value to use if you want the rated capacity).

	Robert Snyder
	{att|ihnp4|clyde}!moss!rjs
	(201) 386-4467

The above statements are my own thoughts and observations and are not
intended to represent my employer's position on the subject(s).