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From: Makey@LOGICON.ARPA (Jeff Makey)
Newsgroups: comp.sys.atari.8bit
Subject: 1050 disk format
Message-ID: <8711031041.8580.Makey@LOGICON.ARPA>
Date: Tue, 3-Nov-87 13:41:00 EST
Article-I.D.: LOGICON.8711031041.8580.Makey
Posted: Tue Nov  3 13:41:00 1987
Date-Received: Sat, 7-Nov-87 06:09:24 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 13

I am writing an exerciser for my (unmodified) Atari 1050 disk drive,
and I would like to know what the "worst cast" pattern is that I should
write to the disk to test for bad media.

For the uninitiated, the worst case pattern is like alternating ones
and zeroes, except that the particular method of encoding the ones and
zeroes on the disk may mean that a different pattern is actually the
"worst" case.  Thus, even if you don't know which pattern is worst you
could help me if you could tell me how ones and zeroes are physically
stored on the disk.  Thanks in advance.

                       :: Jeff Makey
                          Makey@LOGICON.ARPA