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

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Date:	Tue, 16 Mar 2010 11:22:10 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-ide\@vger.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, "H. Peter Anvin" <hpa@...or.com>,
	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.

>>>>> "Tejun" == Tejun Heo <tj@...nel.org> writes:

Tejun> * Anything remotely modern (>= XP) doesn't give a hoot about
Tejun>   cylinder alignment.

Tejun> * Anything older (<= 2000) is very likely to get confused with
Tejun>   custom geometry starting from the BIOS itself.  For those
Tejun>   cases, the only thing we can do is aligning partitions to
Tejun>   cylinders abiding BIOS supplied geometry parameters which will
Tejun>   usually be 255/63.

Tejun> So, using custom geometry doesn't help compatibility at all.

Great reads on this topic.  Might be worth linking to:

	http://www.win.tue.nl/~aeb/partitions/partition_types.html

	http://www.win.tue.nl/~aeb/linux/largedisk.html

-- 
Martin K. Petersen	Oracle Linux Engineering
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