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Article #25884

AUTODISK, FLEXCOPY and fast disk formats

#25884
From: braner
Date: Mon, 23 Mar 1987 22:37
28 lines
1987 bytes
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I didn't think AUTOCOPY and FLEXCOPY would work with floppy disks formatted
with the 'fast' format (the one with a bad tenth sector).  But turns out
they do.  The speed improvement is about two-fold for reading - great for
autoloading of a lot of stuff into RAMdisk on boot.

To copy a disk to a 'fast' disk with FLEXCOPY, you have to format the
destination disk with FORMATER.PRG _before_ you run FLEXCOPY.  And BTW,
FLEXCOPY will let you back up such a disk relatively easily.  (STCOPY won't.)

Note that FLEXCOPY and AUTOCOPY use the Rwabs() call
to read and write the disk, so any disk format that looks normal as far
as Rwabs() calls are concerned (i.e. has the normal _logical_ sectors)
should work with those programs.  STCOPY reads whole tracks at a time, I
believe (for that awesome speed reading _standard_ disks), and therefore
has problems with 'fast' disks.  Rwabs(), on the other hand, reads sector
by sector (roughly - anybody knows _exactly_ what it does?), even when
reading a _lot_ of consecutive sectors in one call.  Half the speed
(on standard disks) but more flexible.

I do not have a copy of 'twister', so I don't know if that is also
compatible with AUTOCOPY and FLEXCOPY.  If _you_ can, please try it out
and tell us all.  

- Moshe Braner

Anybody knows the status of MINIX/ST?
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From: braner@batcomputer.UUCP
Newsgroups: comp.sys.atari.st
Subject: AUTODISK, FLEXCOPY and fast disk formats
Message-ID: <476@batcomputer.tn.cornell.edu>
Date: Mon, 23-Mar-87 17:37:22 EST
Article-I.D.: batcompu.476
Posted: Mon Mar 23 17:37:22 1987
Date-Received: Thu, 26-Mar-87 04:17:13 EST
Reply-To: braner@batcomputer.UUCP (braner)
Distribution: world
Organization: Theory Center, Cornell University, Ithaca NY
Lines: 28
Summary: They work with 'fast' format.  Twister??