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From: kaleb@mars.jpl.nasa.gov (Kaleb Keithley)
Newsgroups: comp.sys.ibm.pc
Subject: Re: MFM on RLL?
Message-ID: <3129@jato.Jpl.Nasa.Gov>
Date: 19 Mar 90 17:04:44 GMT
References: <2881@uwm.edu> <148@cms2.UUCP> <645@sixhub.UUCP>
Sender: news@jato.Jpl.Nasa.Gov
Reply-To: kaleb@mars.UUCP (Kaleb Keithley)
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Organization: Jet Propulsion Laboratory, Pasadena, CA.
Lines: 19

In article <645@sixhub.UUCP> davidsen@sixhub.UUCP (bill davidsen) writes:
>In article <148@cms2.UUCP> tomf@cms2.UUCP (PUT YOUR NAME HERE) writes:
>
>| Mark,
>| An MFM controller formats to 17 sectors per cylinder. An RLL formats to 34
>| sectors per cylinder. It also increases the number of cylinders per platter.
>
>  MFM is 17 sectors per track, RLL is 26 sectors, ARLL is 31, ERLL is
>34. As far as I know only Perstor is selling commercial controllers
>which do more than 26. This is why you went from 21MB to 32MB instead

Western Digital's WD1006 has a manual setup that includes 31 sectors per track.
When I asked about this on the net a couple of months ago, no one knew
anything about it.  Who makes drives that will do 31 sectors per track?

kaleb@mars.jpl.nasa.gov            Jet Propeller Labs
Kaleb Keithley

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