With a few external hard drive outfits pushing out 640GB models this past week, a simple half-terabyte edition now seems mildly inadequate. That said, Buffalo's latest gets brownie points for being almost impossibly thin. The HD-PVU2 lineup is barely thicker than the 2.5-inch HDD within, with 320GB and 500GB versions available. Both black and white flavors will be shipped out to stores, and as e
