linux-kernel - Re: Detection of Advanced Format drives

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Message-ID: <CAMM=eLdTkpV_oy7+N2QVeqmm4t0WkAJXUmGkxWcb=X8Vp81x7A@mail.gmail.com>
Date:	Mon, 26 Sep 2011 16:09:50 -0400
From:	Mike Snitzer <snitzer@...il.com>
To:	Joshua Scoggins <theoretically.x64@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Arun <engineerarun@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Detection of Advanced Format drives

On Mon, Sep 26, 2011 at 3:48 PM, Joshua Scoggins
<theoretically.x64@...il.com> wrote:
> Keep in mind that some AF drives will not report their actual sector
> sizes. I have this issue with the WD AV-25 series. This is to provide
> compatibility with older operating systems that don't support AF
> drives. These are called generation 1 devices. Newer drives will
> directly report their sector size as 4096 through the drive identify
> data older ones will say 512. At that point you just need to do a
> google search to see if it's AF or not.

Linux should publish the discrepancy with these <disk> specific sysfs files:

/sys/block/<disk>/queue/logical_block_size=512
/sys/block/<disk>/queue/physical_block_size=4096

But are you saying you have an AF disk that doesn't publish this
discrepancy via the IDENTIFY DEVICE (ATA) or READ CAPACITY 16 (SCSI)
command?
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