Seagate’s external hard drives were clearly put on some sort of diet because they’re shrinking away to nothing. The firm’s GoFlex Slim is a 2.5-inch 7200RPM hard drive that measure’s in at just 9mm thick. That’s thinner than an iPhone 4 or even a #2 pencil. Best of all, the drive sports USB 3.0 technology for faster transfers to-and-fro a ‘puter. The slender size comes at a price, though. The 320GB drive carries a $99 MSRP, which makes it on the high end of the price to gigabyte scale. But it’s so thin….shipping now.