Replacing tape changer with USB disk drives.

[Wojciech Puchar]

> 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