linux-kernel - Re: ATA support for 4k sector size

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Message-ID: <yq1iqmxey1o.fsf@sermon.lab.mkp.net>
Date:	Thu, 26 Feb 2009 15:35:47 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Matthew Wilcox <matthew@....cx>, Theodore Tso <tytso@....edu>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	sandeen@...hat.com
Subject: Re: ATA support for 4k sector size

>>>>> "hpa" == H Peter Anvin <hpa@...or.com> writes:

>> Quick answer from one of my contacts.  Desktop drives will indeed
>> ship with an alignment of 1(*).  The alignment is hardwired at time
>> of manufacture and can't be changed.
>> 

hpa> Oh God.

hpa> This is a disaster.

Rationale being that modern Microsoft operating systems know how to
interpret the alignment bits.  Legacy XP will work without changes
thanks to the shifted alignment.  And Vista+ will do the right thing to
align partition 1 to what the drive reports.

Also note that Windows only aligns the first partition.  That's
something we need to be aware of when setting up dual boot systems.

-- 
Martin K. Petersen	Oracle Linux Engineering
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