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From: joseph@elbereth.rutgers.edu (Seymour Joseph)
Newsgroups: comp.sys.apple,comp.sys.apple2
Subject: Re: Interleaves, was: Fast reading of floppies...
Message-ID: <Mar.20.19.39.42.1990.6365@elbereth.rutgers.edu>
Date: 21 Mar 90 00:39:42 GMT
References: <1990Mar15.142012.15985@spectre.ccsf.caltech.edu> <13979@nigel.udel.EDU> <Aa0558y00WABE1PUpM@andrew.cmu.edu> <9891@wpi.wpi.edu>
Organization: Rutgers Univ., New Brunswick, N.J.
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The 3.5" drive is not quite continuously variable, but there are a lot
more speeds available than are actually used.   I used to have a Sony
disk diagnostic program for the mac that allowed me to set the drive
speed to anything between 0 and 255.   It would actually spin the disk
at different speeds.

I think you are correct though that Apple only uses a few speeds for
it's normal disk formats.

Seymour