I've had good luck with this 3.5-inch USB 2.0 HDD enclosure from CompUSA (
http://www.compusa.com/products/product ... pfp=SEARCH#). The internal fan is so quiet, I had to reopen the unit to make sure the fan was actually running. If you're looking for a 2.5-inch enclosure, you might check to see if CompUSA offers a similiar model in the smaller size.
The lowest-power external USB 2.0 drive I've run across is the EZ Bus Mini (
http://apricorn.com/product_details.php?ID=414). Here's a short review of it that I wrote recently:
"The company goes by the colorful name of Apricorn, whatever that is. Fortunately, Apricorn's ultra-portable hard drive is much easier to define. According to the company, the EZ Bus Mini is the world's first and only bus powered USB 2.0/IF certified hard drive. I had a chance to try out the 40GB version, which measures a scant 2.75 x 3.93 x 0.59 inches. As small as it is, the case still has room for an integrated USB cable, so you won't have to carry anything extra. I couldn't resist, so I opened the case, where I discovered an Hitachi 9mm-tall 1.8-inch drive -- the same drive Archos uses in its AV480 Pocket Video Recorder.
The EZ Bus Mini draws so little power, you should be able to use it with almost any notebook computer with a built-in USB port. However, it won't work with USB 2.0 PC Card adapters unless you supply an additional power source. The bundled software includes Image EZ (which creates a single compressed backup file) and Clone EZ (which creates a bootable copy of your hard drive). Small enough to fit in your shirt pocket, and fast enough to shuffle gigabytes of data to and from your notebook, the EZ Bus Mini is a great supplement for a notebook with an undersized hard drive."
DavidE
(
www.davidenglish.com)