linux-kernel - Re: ATA 4 KiB sector issues.

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Date:	Wed, 17 Mar 2010 10:13:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ric Wheeler <rwheeler@...hat.com>
CC:	Tejun Heo <tj@...nel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Daniel Taylor <Daniel.Taylor@....com>,
	Jeff Garzik <jeff@...zik.org>, Mark Lord <kernel@...savvy.com>,
	tytso@....edu, hirofumi@...l.parknet.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, irtiger@...il.com,
	Matthew Wilcox <matthew@....cx>, aschnell@...e.de,
	knikanth@...e.de
Subject: Re: ATA 4 KiB sector issues.

On 03/17/2010 08:08 AM, Ric Wheeler wrote:
> On 03/16/2010 06:21 PM, H. Peter Anvin wrote:
>> The only reason I see to care about CHS at all is that there are
>> systems in the field which can only boot from USB in CHS mode, and
>> which often look at the MBR partition table to guess the geometry. Of
>> course, some then *report* the detected geometry but don't *use* the
>> detected geometry...
>
> These systems, given the changes in modern microsoft releases, must be
> doomed even without any effort on our part.
>
> I still think that we should work to make this ancient stuff disappear &
> help force the legacy edge cases to modernize. It has been some huge
> amount of time since storage vendors pretty much abandoned CHS (15
> years? 20?) :-)
>

I wish.  This is mostly systems from the first half of the 2000's 
timeframe.  There was a *huge* regression when BIOS vendors started 
doing USB boot; almost all of them introduced major bugs at that time; 
in many cases they still haven't been fixed.

	-hpa
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