From owner-freebsd-scsi  Fri Jan 17 23:36:12 1997
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Date: Sat, 18 Jan 1997 18:33:33 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199701180733.SAA10696@godzilla.zeta.org.au>
To: freebsd-hackers@freebsd.org, lada@ws2301.gud.siemens.co.at
Subject: Re: TORAY PD disktab entry
Cc: freebsd-scsi@freebsd.org
Sender: owner-freebsd-scsi@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>by popular request I submit the following disktab entry for inclusion in
>/etc/disktab

/etc/disktab should almost never be used.  Just use the "auto" entry,
or equivalently, read the label off the whole disk, modify it to suit
the slice and write it back using -R.

>pd634|Matsushita 634 MB PhaseChange Drive|\
>	:ty=removable:dt=SCSI:se#512:nt#64:ns#32:nc#634:ts#1:rm#4800:\
>	:pc#1298431:oc#0:\
>	:pa#1298431:oa#0:ta=4.2BSD:ba#8192:fa#1024:

Either ns is 1 too large here, or pc is 1 too small, probably the first
(ns*nt*nc = 1298432).  If pc is correct, change nc to 634 and give the
total number of sectors as su#1298431.

>The fdisk output/input was:
>
>cyl: 634 head: 64 sec: 32
>partition 0:
>	sysid: 165
>	start 1, size 1298431, falg 0
>		beg: cyl 0/ sec 2/ head 0/
>		end: cyl 634/ sec 1/ head 0/

Either the end C/H/S is 1 too large here, or the size is 1 too small,
probably the first.  The first sector on the (presumably nonexistent)
635th cylinder is used.  This should cause an error somewhere.  The
end C/H/S must end on the last sector of a cylinder for FreeBSD to
detect the geometry.

Bruce