From owner-freebsd-hackers@FreeBSD.ORG  Thu Mar  1 10:51:36 2012
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Date: Thu, 1 Mar 2012 13:51:35 +0300
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From: "Dmitry S. Kasterin" <dmk.sbor@gmail.com>
To: Sean Bruno <seanbru@yahoo-inc.com>
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Subject: Re: Recurring "rescan already queued" message
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> I had the same issue on my laptop with an eSATA port.  I disabled the
> eSATA port and that made the messages go away.  According to mav@ these
> were harmless, but annoying.

I've found the topic here:
http://forums.pcbsd.org/showthread.php?t=16055

The problem has been solved by setting "hint.ata.1.pm_level" to "1".
Now the messages are gone and I'm pretty happy.

My thanks to Sean and Alexander.