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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Bakul Shah <bakul@bitblocks.com>
References: <86wrry1hwv.fsf@ds4.des.no>
	<20100810184853.21FED5B5A@mail.bitblocks.com>
Date: Tue, 10 Aug 2010 23:08:41 +0200
In-Reply-To: <20100810184853.21FED5B5A@mail.bitblocks.com> (Bakul Shah's
	message of "Tue, 10 Aug 2010 11:48:53 -0700")
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Cc: geom@freebsd.org, hackers@freebsd.org
Subject: Re: Support for WD Advanced Format disks
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Bakul Shah <bakul@bitblocks.com> writes:
> http://www.wdc.com/en/library/2579-001028.pdf gives an
> explanation of what the drive letters mean but they don't
> talk about 4k sector size.

The latest data sheet for the entire Green series is here:

http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-701229.pdf

>     Some models of the WD Caviar Green and WD Scorpio Blue
>     product families are built using Advanced Format technology.
>     Over time more models and capacities will be added. WD drives
>     with Advanced Format technology include special installation
>     information on the drive label so be sure to read the label
>     on your drive before installing it.          ^^^^^^^^^^^^^^
>     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> So it seems that only the label distinguishes 4k sector drives.

The data sheet clearly says that *only* AARS and EARS disks are AF.
Also, it's not just the label - AF disks have AF-specific jumper
settings.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no