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Date: Fri, 27 Feb 2009 17:23:12 +1100
From: Andrew Snow <andrew@modulus.org>
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To: Rusu Silviu <bsdgroup.md@gmail.com>, freebsd-fs@freebsd.org
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Subject: Re: Extremely slow read/write speed(4Mb/s), 7.1 Release on Intel
 ICH9 	SATA
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Rusu Silviu wrote:
> dd if=/dev/ad4 of=/dev/null

Try adding "bs=1024k" to that command line.