Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!uwm.edu!cs.utexas.edu!uunet!maxed!root
From: root@maxed (0000-Admin(0000))
Newsgroups: comp.unix.i386
Subject: Re: mkfs gap option
Message-ID: <1990May2.144452.4208@maxed>
Date: 2 May 90 14:44:52 GMT
References: <511590@nstar.UUCP< <1990Apr19.025739.19180@nebulus.UUCP> <PCG.90Apr28151407@rupert.cs.aber.ac.uk> <1990Apr29.000503.10934@nebulus.UUCP> <PCG.90Apr30221039@odin.cs.aber.ac.uk> <715@bilver.UUCP>
Sender: maxed!ed
Organization: American Micro Group, Ft. Lee, NJ
Lines: 31

In article <715@bilver.UUCP> bill@bilver.UUCP (Bill Vermillion) writes:
>In article <PCG.90Apr30221039@odin.cs.aber.ac.uk< pcg@cs.aber.ac.uk (Piercarlo Grandi) writes:
><
><In article <1990Apr29.000503.10934@nebulus.UUCP> dennis@nebulus.UUCP
><(Dennis S. Breckenridge) writes:
><
><   pcg@cs.aber.ac.uk (Piercarlo Grandi) writes:
><
><   >Essentially the gap size depends on rotational speed of the disc
><   >(virtually a constant), and on interrupt latency and IO operation
><    ^^^^^^^^^^^^^^^^^^^^^^ What is this? Different drives have DIFFERENT
><    speeds. Even the same supplier does NOT adhere to the same speeds. 
><
><Bah. Virtually every drive around does 3600 RPM, for an average
><rotational latency of 8.3 ms. Exceptions I know are the optical drives
><(slower, they have a limit in the state changes/sec. of their
><head/medium).
>
>And just last week I was looking over the specs on the current Shugart lines,
>and there were 3 different drive rotational speeds listed.
>
>All were SCSI drives.  Since we just talk to the host in SCSI land it really
>doesn't make any difference to us.  And many of the new SCSI's are using zone
>bit recording - so we don't know much about the data, execpt it's block #.

Many of the new 20 and 25 MHz ESDI & SCSI drives are turning at
5400 rpm. Latency and access times are reduced. Can't count on 3600
any more.
-- 
 Ed Whittemore 		uunet!maxed!ed
 American Micro Group 		201 944 3293