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From: "Mark Powell" <M.S.Powell@salford.ac.uk>
To: Garrett Cooper <yanefbsd@gmail.com>
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Cc: "army.of.root" <army.of.root@googlemail.com>, freebsd-current@freebsd.org,
	Andriy Gapon <avg@icyb.net.ua>
Subject: Re: ata: printf on every spinup/spindown?
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On Tue, 17 Mar 2009, Garrett Cooper wrote:

> Spinning down to a lower RPM seems legitimate, compared to spinning it
> down, which kills the drives.

AFAIK there are no drives which have multiple spin speeds. That's too 
complex.

> Look at WD's green drives -- they claim to get 30% ~ 50% better power 
> efficiency than standard drives.

Though WD may like to make it appear their GP drives, vary between 5400 
and 7200, all current models spin at a fixed 5400rpm. Looked at closely, 
their claims only suggest that they may in future release GP drives which 
spin at 7200rpm, but in truth they won't.
   Cheers.

-- 
Mark Powell - UNIX System Administrator - The University of Salford
Information & Learning Services, Clifford Whitworth Building,
Salford University, Manchester, M5 4WT, UK.
Tel: +44 161 295 6843  Fax: +44 161 295 5888  www.pgp.com for PGP key