We have just spotted another USB portable had drive which is not as compact in size as its competitors but at least it looks fine and has a decent form factor. What you see above is yet another portable hard drive by Hitachi, Hitachi G-Drive slim. Bad news for PC users because this is only compatible with MacBook Air. The drive is slim measuring only 0.39 inch and weighs only 0.33 lbs. The Hitachi G-Drive slim is of course a USB powered hard drive and it supports USB 2.0 data transfer rate which can go up to 480Mbits/sec. It is a 2.5” external hard drive having 320GB capacity. The Hitachi G-Drive slim is a very compact USB portable drive in stylish aluminum housing. This drive is plug-and-play. It comes with a 3-year warranty and has a price of $99 only.