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From: jjg@ccice5.UUCP (John Grana)
Newsgroups: net.micro
Subject: Re: confused about disk drive specifications
Message-ID: <868@ccice5.UUCP>
Date: Mon, 15-Jul-85 19:44:18 EDT
Article-I.D.: ccice5.868
Posted: Mon Jul 15 19:44:18 1985
Date-Received: Thu, 18-Jul-85 07:39:35 EDT
References: <11527@brl-tgr.ARPA>
Organization: CCI Central Engineering, Rochester, NY
Lines: 15


> 
> Disks have to be approached differently from tapes, because a tape can be made
> to move the media at a fixed rate.  A disk changes the rate each time you go to
> a different track.  Your controller
> isn't really writing Bits Per Inch--it's writing Bits Per Second.  I'm sure
> some creative engineering could get around that, but I'm not aware of any.
> (I have heard rumors that some disk systems vary the timing based on the track
> number so they can get more data on the outside tracks--can anybody verify 
> this?)

 The IWM (Integrated Woz Machine) in the Mac uses the above to get more
 sectors on the outer tracks...

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