From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michal Soltys <soltys@ziu.info>
Subject: Re: 2.6.27.10: ata1.00: HPA detected: current 293044655, native 293046768
Date: Tue, 30 Dec 2008 16:41:33 +0100
Message-ID: <495A412D.9040603@ziu.info>
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To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-raid@vger.kernel.org, Alan Piszcz <ap@solarrain.com>
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Justin Piszcz wrote:
> On one system, two Raptor 150s:
> 
> [    0.739402] ata1.00: HPA detected: current 293044655, native 293046768
> [    0.739491] ata1.00: ATA-7: WDC WD1500ADFD-00NLR5, 21.07QR5, max 
> 
> Why does this occur?
> 

Drives I bought on different occasions also had some of the space 
reserved, while some others didn't. You can change it with hdparm's -N 
option.