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From: d6b@psuecl.bitnet
Newsgroups: comp.sys.amiga
Subject: Re: SCSI vs. ST506 vs. ESDI vs. Whatever else there is???
Message-ID: <1990Sep21.225835.20649@psuecl.bitnet>
Date: 22 Sep 90 02:58:34 GMT
References: <Sep.19.12.05.42.1990.26653@dimacs.rutgers.edu> <184@thor.UUCP>
Followup-To: comp.sys.amiga
Organization: Engineering Computer Lab, Pennsylvania State University
Lines: 13

In article <184@thor.UUCP>, scjones@thor.UUCP (Larry Jones) writes:
> RLL is Run Length Limited.  There are actually infinitely many RLL
> recording schemes including FM (RLL 0,1) and MFM (RLL 1,3).  When used

Just to clarify: what do the two numbers mean? Take MFM as an example.
I assume that the 1 means at least 1 zero (lack of transition) after a one,
and the 3 means up to 3 zeros in a row, but I'm not sure...what's the
correct interpretation? Also, what's the relative (raw) bit frequency
(with an equivilent transition density) for MFM and RLL (I assume 1.5)?
And ARLL?

Thanks for the article...very nicely done!

-- Dan Babcock