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Xref: sserve comp.os.386bsd.misc:995 comp.os.386bsd.development:1206 Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!howland.reston.ans.net!math.ohio-state.edu!cs.utexas.edu!geraldo.cc.utexas.edu!sneezy.cc.utexas.edu!not-for-mail From: vax@sneezy.cc.utexas.edu (Vax) Newsgroups: comp.os.386bsd.misc,comp.os.386bsd.development Subject: Re: AMIFS? (was: Re: BSD UNIX) Date: 13 Sep 1993 19:00:36 -0500 Organization: The University of Texas - Austin Lines: 27 Message-ID: <2731j4$bpq@sneezy.cc.utexas.edu> References: <SWILDNER.93Sep4145521@channelz.GUN.de> <1993Sep7.163857.19661@fcom.cc.utah.edu> <CD02sM.E3D@veda.is> NNTP-Posting-Host: sneezy.cc.utexas.edu In article <CD02sM.E3D@veda.is>, Adam David <adam@veda.is> wrote: >terry@cs.weber.edu (A Wizard of Earth C) writes: > >>Note that the MAC is similarly handicapped, but is even more variable than >>the Amiga -- it may be possible to read Amiga disks on the MAC without a >>great deal of trouble, but reading MAC disks on an Amiga or PC without >>better hardware will be impossible (the MAC can write disks that other >>machines can read, but doesn't by default). > >This is true for 800kB Mac disks, they are GCR encoded and have 5 different >storage density zones. The Mac hardware deals with this by having the drive >spin at variable speeds. I have heard many stories of programs that read mac disks on other platforms with more "standard" drives. For example, I heard of an Amiga program that shuts power on and off to the drive to "simulate" the different speeds that the mac spins them at. Also, I have heard of using some "latency timer" to simulate a funky kind of interleave on a normal 3.5" drive that will read the different densities of disks. Both parties swear up and down that they've seen it work. -- Protect our endangered bandwidth - reply by email. NO BIG SIGS! VaX#n8 vax@ccwf.cc.utexas.edu - Don't blame me if the finger daemon is down