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

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Message-ID: <4B972B54.8050708@zytor.com>
Date:	Tue, 09 Mar 2010 21:17:08 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Daniel Taylor <Daniel.Taylor@....com>
CC:	Tejun Heo <tj@...nel.org>, Greg Freemyer <greg.freemyer@...il.com>,
	James Bottomley <James.Bottomley@...e.de>,
	linux-ide@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	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, mkp@....net
Subject: Re: ATA 4 KiB sector issues.

On 03/09/2010 04:14 PM, Daniel Taylor wrote:
>
> The MBR in a GPT installation doesn't map the first GPT partition, it maps
> the entire drive
> drive after the first sector, as well as marking it type 0xEE.  The start
> LBA of the file system
> is not correctly located in the MBR.
>
> I will run some experiments to see if any of the systems on my desk can boot
> Linux from a GPT.

There is something called a "hybrid MBR", which is basically a GPT disk 
with a single partition (the current bootable partition) mapped as an 
MBR partition, instead of marking the whole disk 0xEE.

	-hpa
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