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Date: Wed, 12 May 2010 21:24:13 -0300 (ADT)
From: Andrew Hamilton-Wright <AHamiltonWright@MtA.ca>
To: Adam Vande More <amvandemore@gmail.com>
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Cc: FreeBSD - <freebsd-questions@freebsd.org>, Mike Tancsa <mike@sentex.net>
Subject: Re: Long I/O pauses on same mass storage
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On Wed, 12 May 2010, Adam Vande More wrote:

> On Wed, May 12, 2010 at 6:21 PM, A. Wright <andrew@qemg.org<mailto:andrew@qemg.org>> wrote:

> > As far as I can tell, it is a standard 512 byte sector.  The
> > general lack of documentation with this drive (shipped in a
> > plastic "coffin" -- the only docs supplied with it were the
> > label itself), but on the WD site, they indicate:
> >       Formatted Capacity      1500301 MB
> >       Used Sectors Per Drive  2930277168
>
> As I understand it, all the 64MB EARS model drive have the WD
> Advanced Format eg 4k sectors.  I don't have one and I'm pulling
> this (from the depths of memory || out of my ass), but I think
> those drives also have something funky going on where they
> report normal 512 sector when in fact they do have 4k ones.
> Either way, it wouldn't hurt to align on 1MB boundaries.

I just got confirmation back from WD, and your nether regions
are correct -- this _is_ a 4096 byte sector drive.  I have
suggested to WD that they may wish to mention this salient
fact somewhere.

Thanks again,
Andrew.