linux-kernel - Re: [Bugme-new] [Bug 37682] New: Kernel mis-detects size/position of partition created with Seagate DiscWizard (OnTrack Disk Manager)

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Message-ID: <1308358960.2166.20.camel@t41.thuisdomein>
Date:	Sat, 18 Jun 2011 03:01:48 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	markk@...ra.co.uk, bugme-daemon@...zilla.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 37682] New: Kernel mis-detects size/position
 of partition created with Seagate DiscWizard (OnTrack Disk Manager)

On Fri, 2011-06-17 at 14:31 -0700, Andrew Morton wrote:
> > In case it helps to diagnose the problem, I have attached the first 0x11000
> > bytes of this disk.

0) $ /sbin/sfdisk -l First_0x11000_bytes.bin 
Disk First_0x11000_bytes.bin: cannot get geometry

Disk First_0x11000_bytes.bin: 0 cylinders, 255 heads, 63 sectors/track
detected Disk Manager - unable to handle that
 First_0x11000_bytes.bin: unrecognized partition table type
No partitions found

1) $ dd if=First_0x11000_bytes.bin of=First_0x9200_bytes.bin bs=512 skip=63
73+0 records in
73+0 records out
37376 bytes (37 kB) copied, 0.0224746 s, 1.7 MB/s

2) $ /sbin/sfdisk -l -uS First_0x9200_bytes.bin 
Disk First_0x9200_bytes.bin: cannot get geometry

Disk First_0x9200_bytes.bin: 0 cylinders, 255 heads, 63 sectors/track
Units = sectors of 512 bytes, counting from 0

   Device Boot    Start       End   #sectors  Id  System
First_0x9200_bytes.bin1   *        63  39102209   39102147   c  W95 FAT32 (LBA)
		end: (c,h,s) expected (1023,254,63) found (385,254,63)
First_0x9200_bytes.bin2             0         -          0   0  Empty
First_0x9200_bytes.bin3             0         -          0   0  Empty
First_0x9200_bytes.bin4             0         -          0   0  Empty

39102147 seems to be close to what the reporter expects to see.

3) Some searches suggest there used to be a "hda=remap63" boot option
for this, ie OnTrack Disk Manager, but I can't find it grepping the
source nor could I find the commit(s) that removed it.


Paul Bolle

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