Hitachi Travelstar Z5K320 320GB 7mm 2.5-inch Hard Drive

Hitachi didn’t wait to see how this market would develop and went straight into action making their first 7mm thin HDDs, the Z-Series. The Z-Series can be broken down to two categories; the Z5 and Z7. These are the 5,400 and 7,200 RPM drives and as you would expect the 5 and 7 in the names make differentiating them apart much easier. @ TweakTown