Seagate ST9500325AS Momentus 5400.6 SATA 3Gb/s 500-GB Hard Drive, The 500-GB Seagate® Momentus® 5400.6 drive offers the best combination of performance, capacity, mobility and durability in a laptop hard drive to meet the demanding requirements of today’s notebook multimedia usage models. Able to withstand up to 1000 Gs of shock, this highly reliable 2.5-inch drive is perfect for notebook or external storage applications.