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).