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

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Date:	Wed, 25 Feb 2009 19:07:49 -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>, 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:

hpa> Martin K. Petersen wrote:
>> 
>> Modern Windows aligns the first partition on a 1 MB boundary.
>> 
>> As far as disks go, initially the plan was to have "legacy" branded
>> drives with 63-sector alignment.  But I think that has been abandoned
>> in favor of instant one-time formatting.  I.e. you can pick your
>> poison *once* and that formatting will be done in constant time.  Any
>> subsequent changes to blocking and alignment will require a real
>> low-level format.
>> 

hpa> Why one-time?

It's a compromise to avoid hours of low-level formatting before you can
use a drive.  New drives will come from the factory formatted in a
special way that can be switched instantaneously.  But once you start
writing you're stuck with it.

-- 
Martin K. Petersen	Oracle Linux Engineering
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