Travelstar Z5K1000 is the third generation 7.0mm, 5400 RPM, 2.5-inch hard drive from HGST, offering 750GB and 1TB capacities. This newest addition to the Travelstar family achieves the industry's highest 7.0mm capacity through an innovative two-disk design in a form factor that typically accommodates only one disk. The Z5K1000 is designed to expand the storage capacity for slim-design notebook PCs, which has been limited to 500GB based on past one-disk design capacities. HGST 7.0mm drives may also be used as direct replacements for standard 9.5mm HDDs in notebook PCs, especially slim-design, and external storage with thinner and more robust device designs.