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

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Message-ID: <4BA07B40.9090400@zytor.com>
Date:	Tue, 16 Mar 2010 23:48:32 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	James Bottomley <James.Bottomley@...e.de>
CC:	Tejun Heo <tj@...nel.org>,
	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, jdelvare@...e.de
Subject: Re: ATA 4 KiB sector issues.

On 03/16/2010 06:24 AM, James Bottomley wrote:
>
> Because the msdos label can only partition in units of cylinders.  If
> you're using an msdos label, picking the right H/S gets you alignment.
>

This is doubly false.

An MS-DOS partition table can partition at any boundary.  Some OSes 
(like some versions of MS-DOS) needed track alignment because their boot 
loaders did not support crossing track boundaries.

Second, the primary field in the (modern) MS-DOS partition table is an 
LBA field.  The CHS fields are largely historic and useless because of 
the 1024-cylinder limitation, and by only being 24 bits total.

	-hpa
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