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From: "Angelo Turetta" <aturetta@rainbownet.com>
To: =?iso-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk>,
	"Kevin Oberman" <oberman@es.net>
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Date: Fri, 10 Sep 2004 11:38:03 +0200
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cc: freebsd-current@FreeBSD.ORG
cc: Bjoern Koenig <bkoenig@cs.tu-berlin.de>
cc: sos@FreeBSD.ORG
Subject: Re: poor ATA disk speed with ICH2
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>----- Original Message ----- 
>From: "Kevin Oberman" <oberman@es.net>
>Sent: Thursday, September 09, 2004 10:28 PM
>
> While the test is running, the disk being written to "sings" with the
> frequency somewhat dependent on the size of the write. On read, I get
> silence. When I copy my full disk (if=ad0 of=ad2), I can clearly hear
> the sound of the actuator moving the heads constantly toward the end of
> the backup. I assume that they are being returned to track 0 on a
> repeated basis.

This sounds a lot like thermal recalibration seeks, to me. Except it's
something modern hardware is supposed to need very rarely, if not at all...
Might be the effect of some power-saving setting intruduced in 5.x ?
(or maybe the new ATA code is actually so fast it's overheating your disks
:-) :-)

Angelo Turetta