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Date: Tue, 17 Jun 2008 18:06:37 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: freebsd-questions@freebsd.org, roberthuff@rcn.com, chris@vindaloo.com
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Subject: Re: Replacing tape changer with USB disk drives.
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> Cheap controller in the USB enclosure.  I've used quite
> a few USB enclosures in the past years, and there are
> significant performance differences.  As a rule of thumb,
> the cheaper the box, the slower it is.  Of course there
> are exceptions to that rule.

actually - firewire enclosures are not much more expensive, but you always 
get at least 40MB/s