Seagate 3TB Laptop HDD SATA 6Gb/s 128MB Cache 2.5-Inch 15 mm Height Internal Hard Drive (ST3000LM016) Each drive can store more than 1 million songs or 480 hours of HD video Ideal for applications, such as: external storage, all-in-one PC storage and ultra-slim desktop storage Smaller than your regular 3.5-inch desktop HDD, at 2.5 inches, yet delivers up to 4TB of storage capacity