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Message-ID: <yq1skm2giwa.fsf@sermon.lab.mkp.net>
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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