From: Mark Lord <kernel@teksavvy.com>
To: Herbert Poetzl <herbert@13thfloor.at>
Cc: linux-ide@vger.kernel.org
Subject: Re: WDC WD20EARS and 4k sector size
Date: Mon, 24 Jan 2011 23:21:42 -0500 [thread overview]
Message-ID: <4D3E4FD6.2020902@teksavvy.com> (raw)
In-Reply-To: <20110125030410.GA24024@MAIL.13thfloor.at>
On 11-01-24 10:04 PM, Herbert Poetzl wrote:
>
> I recently bought the WDC WD20EARS-00MVWB0 because it
> was really cheap for a drive with 64 MB cache, and I
> wanted to try out a 4k sector size disk ...
>
> Now the drive performs quite well, is rather silent
> and doesn't use much power or produce much heat, but
> at first I didn't find anything in Linux indicating
> that this drive would actually use 4k sectors.
>
> To shorten things, I asked around on IRC, had a chat
> with some other folks, found a jumper description on
> the WD site talking about an 'Advanced Format' jumper
> and finally contacted WD in a lengthy email thread.
My understanding about that jumper is that
you DO NOT WANT THE JUMPER ON.
Without the jumper, sector 0 is 4KB aligned,
as is any sector multiple of 4.
But WITH the jumper, sector 0 is no longer 4KB aligned..
everything shifts by one (or seven) such that sector
63 ends up being the start of a 4KB low-level sector,
instead of the more sensible sector 64.
Right?
next prev parent reply other threads:[~2011-01-25 4:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-25 3:04 WDC WD20EARS and 4k sector size Herbert Poetzl
2011-01-25 3:15 ` Martin K. Petersen
2011-01-25 3:32 ` Herbert Poetzl
2011-01-25 3:40 ` Greg Freemyer
2011-01-25 3:52 ` Martin K. Petersen
2011-01-25 4:23 ` Mark Lord
2011-01-25 8:26 ` Michael Tokarev
2011-01-25 10:01 ` Tejun Heo
2011-01-25 4:09 ` Jeff Garzik
2011-01-25 4:21 ` Mark Lord [this message]
2011-01-25 4:34 ` Herbert Poetzl
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