Engineered specifically for low-power applications, the Seagate Momentus LP 1TB Internal Laptop Hard Drive has a 5400RM spindle speed and a 8MB cache to provide energy-efficient performance at whisper-quiet acoustic levels. With reduced power consumption and heat generation, this Seagate Momentus laptop hard drive will reduce power costs up to 50 percent over the life of the system compared to standard drives. This 2.5" Internal laptop hard drive is optimized for standard laptops and small form factor PCs. With 1TB of space, this Seagate Momentus laptop hard drive holds up 666,000 photos, 285,000 songs and 526 movies. Compatible with PCs or Macs, the Seagate Momentus LP 1TB Internal Laptop Hard Drive also features QuietStep technology, Native Command Queuing and Perpendicular recording technology.