linux-kernel - Re: [PATCH] msdos: add support for large disks

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Message-ID: <4B8FD1C8.6040203@zytor.com>
Date:	Thu, 04 Mar 2010 07:29:12 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
CC:	Daniel Taylor <Daniel.Taylor@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] msdos: add support for large disks

On 03/04/2010 01:18 AM, OGAWA Hirofumi wrote:
> "Daniel Taylor"<Daniel.Taylor@....com>  writes:
>
>> It is only the intermediate variables in the module that are
>> currently hard-coded to 32-bits, and which truncate the values.
>
> BTW, it may not be only 32-bits truncate issue. IIRC, e.g. some
> implement is checking the 0xaa mark at the end of sector. I forgot
> almost though, IIRC, Windows writes 0xaa mark to the both of "end of
> sector" and "end of 512" for compatibility.
>
> Thanks.

The spec is that the mark, partition table etc. at the end of 512 bytes; 
of course, a lot of people go that wrong.

	-hpa
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