Hitachi has recently rolled out the Z7K320, which is the thinnest member of the Travelstar series. Measuring 7mm thin and weighing 95grams, the Travelstar Z7K320 is claimed to be the world’s first 7200rpm, 7mm 2.5-inch drive for high-performance compact systems and devices. This storage device is currently available only in 320GB of storage capacity.