Re: How to read MAC disks on PC?

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#3641

From: Larry Jones
Date: Fri, 08 Jan 1993 22:07

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In article <817@ulogic.UUCP>, hartman@ulogic.UUCP (Richard M. Hartman) writes:
> PC disks are formatted in concentric circles.  Mac disks are
> formatted in a spiral (like your old black vinyl records).  (This
> is what let Macs put 800k on a floppy that the PC could only get 
> 720k on.) 

No, Mac disks are formatted in concentric circles, too.  The difference
is that the Mac drive changes the speed that the disk rotates as the
head moves in and out, thus keeping the speed that the media moves past
the head approximately constant.  This means that you can record more
sectors on the longer outer tracks than on the shorter inner tracks and
that's where the extra capacity comes from.
----
Larry Jones, SDRC, 2000 Eastman Dr., Milford, OH  45150-2789  513-576-2070
larry.jones@sdrc.com  or  ...uunet!sdrc!larry.jones
Don't you hate it when your boogers freeze? -- Calvin

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Path: arc1-ca.pugleaf.net!sparky!uunet!psinntp!heimdall!thor!scjones

References: <1993Jan5.180549.21159@mcs.drexel.edu> <817@ulogic.UUCP>

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Path: arc1-ca.pugleaf.net!sparky!uunet!psinntp!heimdall!thor!scjones
From: scjones@thor.sdrc.com (Larry Jones)
Newsgroups: comp.os.msdos.misc
Subject: Re: How to read MAC disks on PC?
Message-ID: <322@heimdall.sdrc.com>
Date: 8 Jan 93 22:07:13 GMT
References: <1993Jan5.180549.21159@mcs.drexel.edu> <817@ulogic.UUCP>
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