Path: utzoo!attcan!uunet!wuarchive!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!tarpit!bilver!bill
From: bill@bilver.UUCP (Bill Vermillion)
Newsgroups: comp.unix.i386
Subject: Re: mkfs gap option
Message-ID: <715@bilver.UUCP>
Date: 2 May 90 03:50:09 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>
Reply-To: bill@bilver.UUCP (Bill Vermillion)
Organization: W. J. Vermillion, Winter Park, FL
Lines: 27

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 #.

-- 
Bill Vermillion - UUCP: uunet!tarpit!bilver!bill
                      : bill@bilver.UUCP