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From: Robert Eckardt <re@ghost.mep.ruhr-uni-bochum.de>
Message-Id: <199607280816.KAA08014@ghost.mep.ruhr-uni-bochum.de>
Subject: Update on 'partition sector garbled ...'
To: questions@freebsd.org
Date: Sun, 28 Jul 1996 10:16:28 +0200 (MET DST)
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Hello,

about one year ago I reported a bug in FBSD-2.0.5.
My ISC-Unix partition was removed from the partition sector while
installing FreeBSD. This error persisted in 2.1 and is also alive
in 2.1.5.

This time however, I went into depth and found that the wd driver
reports the wrong number of cylinders.
My AT-Bus disk (Conner 544CP) has 1054 cylinders, but FreeBSD sees
only 1053. It is partitioned as:
System         Boot  Sid Cyl Sec  Sid Cyl Sec  Offset   Size
DOS-16    (4)  No     1    0  1   15   64  63      63   65457
FreeBSD (165)  No     0   65  1   15  227  63   65520  164304
ISC-2.2  (99)  Yes    0  390  1   15 1023  63  393120  669312
Solaris (130)  No     0  228  1   15  389  63  229824  163296

The ISC partition ends on cylinder 1053 (and it exists indeed).

However, since fdisk sees only 1053 (0-1052) cylinders the
ISC-partition is not completely inside the disk and therefore
marked as 'unused'. (Writing the slices leaves me with some handwork
to restore the partition table. :-( )
Note that ISC saw 1054 cyls. -- as in the BIOS
-- that's why I used them.

Any idea why FreeBSD sees only 1053 cyls. or how to work around ?
Anything special about the Conner ?

Regards,
Robert