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From: ral@pyuxqq.UUCP (R A Levenberg)
Newsgroups: net.micro
Subject: Re: confused about disk drive specifications
Message-ID: <741@pyuxqq.UUCP>
Date: Mon, 22-Jul-85 17:52:41 EDT
Article-I.D.: pyuxqq.741
Posted: Mon Jul 22 17:52:41 1985
Date-Received: Thu, 25-Jul-85 03:03:58 EDT
References: <11527@brl-tgr.ARPA> <868@ccice5.UUCP> <752@wlcrjs.UUCP>
Organization: Bell Communications Research, Piscataway, NJ
Lines: 20

Re:
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?

I remember when HP first brought out the HP 150, it used 3.5" floppies
that handled only 256K per disk.  Then along came the Macintosh,
which used the same 3.5" disks, but by varying the speed of the drive
depending on the seek address, the Mac was able to get 400K on each floppy.

========================================================================
Ron Levenberg
Bell Communications Research
3 Corporate Place
Room 2C-315
Piscataway, NJ 08854

(201) 981-6178
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