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From: jt19840@tut.fi (Tuomi Jyrki Juhani)
Newsgroups: comp.sys.ibm.pc
Subject: Re: MFM on RLL?
Message-ID: <3239@tutor.tut.fi>
Date: 18 Mar 90 17:40:27 GMT
References: <2881@uwm.edu> <148@cms2.UUCP> <645@sixhub.UUCP>
Reply-To: jt19840@tutor.tut.fi (Tuomi Jyrki Juhani)
Distribution: all
Organization: Tampere University of Technology, Finland
Lines: 22

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

The formatting routine included in the on-board BIOS of my WD1006V-SR2
has several built-in drive types (a la AT SETUP).  It also allows user-
defined drive parameters, and then asks for NUMBER OF SECTORS (26 OR 31).
I didn't go for 31, as I am quite satisfied with 26 s/t on my ST251-1
(running RLL just fine for the 20th month...)


-- 

Jyrki Tuomi
Internet:  jt19840@tut.fi    UUCP:  ..mcvax!tut!jt19840