Travelstar Z7K320 is the industry"s first 7200 RPM, 7mm, 2.5-inch hard drive with capacities ranging from 160GB to 320GB. The 320GB per platter one-disk models are designed as a direct replacement for standard 9.5mm HDDs, for use in notebook PCs, external storage and compact systems. The Z7K320 offers design flexibility to accommodate new thinner and more robust devices/systems and delivers up to 18% better application performance than 5400 RPM models of the same capacity.2DY0625. 0625. Hgst HGST Travelstar Z7K320 HTE723225A7A364 250 GB 2.5" Internal Hard Drive.