The Seagate Momentus 5400.4 drive offers a great combination of capacity, mobility and durability in a laptop hard drive and features reliability-boosting second-generation perpendicular magnetic recording (PMR).By utilizing Seagate's second-generation PMR, the Momentus 5400.4 drive delivers great capacity along with exceptional durability. And with a powerful 3-Gb/s SATA interface, this drive will be able to keep up with the demanding digital world in mainstream laptops, workstations, gaming laptops and personal external storage.