linux-kernel - Re: Detection of Advanced Format drives

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Message-ID: <CAK3HsqvkpEiDWcCP_+eO0va4+io7pVV-aWCzQ1=DdpPi_jxy6g@mail.gmail.com>
Date:	Mon, 26 Sep 2011 12:48:46 -0700
From:	Joshua Scoggins <theoretically.x64@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Arun <engineerarun@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Detection of Advanced Format drives

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.

-Josh


On Mon, Sep 26, 2011 at 3:15 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Mon, 26 Sep 2011 15:25:52 +0530
> Arun <engineerarun@...il.com> wrote:
>
>> Is there any way to detect the Advanced Format hard drives with 4K
>> sector size? I understand that above kernel v. 2.6.31 it is supported.
>> But is it possible detect automatically if the drive is an AF drive
>> and how?
>
> It's in the drive identify data (see the ATA 8 specification documents)
>
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