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

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Message-ID: <49A5DDF7.9070301@zytor.com>
Date:	Wed, 25 Feb 2009 16:10:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	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

Martin K. Petersen wrote:
> 
> 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.
> 

That's ridiculously stupid.  All you need is an offset parameter, which 
can be flipped at will.  Now, flipping it will obviously scramble all 
data, but there is absolutely no reason why it shouldn't be possible to 
instantaneously flip it back and forth.

	-hpa
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