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Date: Mon, 19 Jun 1995 23:16:11 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199506191316.XAA03425@godzilla.zeta.org.au>
To: hlew@genome.Stanford.EDU, terry@cs.weber.edu
Subject: Re: 2.05R panics on boot
Cc: bde@zeta.org.au, bugs@FreeBSD.org
Sender: bugs-owner@FreeBSD.org
Precedence: bulk

>Okay, if boot from DOS (and with no Ontrack DM installed)... here's the 
>output from pfdisk 0 (the 850MB Ontrack DM DOS Drive) and pfdisk 1 (540 
>MB FreeBSD drive)

># Partition table on device: 0
>geometry 1024 16 63 (cyls heads sectors)
>#  ID  First(cyl)  Last(cyl)  Name  # start, length (sectors)
>1  84      0       1652       unkno # 1, 1666223
># note:  last(1): phys=(628,15,63) logical=(1652,15,63)
># note: first(1): phys=(0,0,2) should be (0,1,1)
>2   0      0          0       empty # 0, 0
>3   0      0          0       empty # 0, 0
>4   0      0          0       empty # 0, 0

This is OK (except the `should be' note shouldn't be).

># Partition table on device: 1
>geometry 1022 16 63 (cyls heads sectors)
>#  ID  First(cyl)  Last(cyl)  Name  # start, length (sectors)
>1 165      0       1052       unkno # 63, 1061361
># note:  last(1): phys=(1023,15,63) logical=(1052,15,63)
>2   0      0          0       empty # 0, 0
>3   0      0          0       empty # 0, 0
>4   0      0          0       empty # 0, 0

OK, but several other things will have to be right to handle the partition
extending beyond cylinder 1024:

1) The BSD boot partition (normally wd1a) must not extend beyond cylinder
   1024.
2) bad144 must not be used.
3) The boot manager must not object to booting such partitions.  I think
   the OS/2 boot manager would object.

>---------
>Now if I boot from the hard drive with Ontrack DM's dynamic drive overlay 
>installed...

># Partition table on device: 0
>geometry 826 32 63 (cyls heads sectors)
>#  ID  First(cyl)  Last(cyl)  Name  # start, length (sectors)
>1   1      0        825       DOS12 # 63, 1665153
>2   0      0          0       empty # 0, 0
>3   0      0          0       empty # 0, 0
>4   0      0          0       empty # 0, 0

This is OK.

># Partition table on device: 1
>geometry 1022 16 63 (cyls heads sectors)
>#  ID  First(cyl)  Last(cyl)  Name  # start, length (sectors)
>1 165      0       1052       unkno # 63, 1061361
># note:  last(1): phys=(1023,15,63) logical=(1052,15,63)
>2   0      0          0       empty # 0, 0
>3   0      0          0       empty # 0, 0
>4   0      0          0       empty # 0, 0

OK.

>So it appears that nothing changes on the 540MB drive that doesn't use 
>Ontrack DM.  So any ideas?

The problem seems to have nothing to do with disk manager.  Maybe your
boot manager objects to partitions extending beyond cylinder 1024.

Bruce