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. This new drive also leverages Advanced Format, which increases the physical sector size on hard drives from 512 byte to 4096 (4K) bytes to increase drive capacities and improve error correction capabilities.