With amazing storage size for such a small internal hard drive, the Western Digital Scorpio Blue allows for storage of all the important files on the portable digital device without depending on external media. A rotational speed of 5,400 RPM, buffer size of 8 MB and transfer rates up to 3 GBps gives this Western Digital 1 TB Hard Drive almost desktop speeds in a small, 63.5-mm (2.5-inch) form factor. ShockGuard technology protects the rugged Western Digital Scorpio Blue from shocks and SecurePark keeps the recording heads off the disk surface as much as possible for less wear and longer reliability. Advanced power management keeps the energy consumption low on this Western Digital 1 TB Hard Drive for maximum battery life. This internal hard drive is perfect for use in portable devices like notebook computers and digital media players. The Western Digital 1 TB Hard Drive measures 9.5 mm by 100.2 mm by 69.9 mm (0.4 inches by 3.9 inches by 2.8 inches) and weighs 100 g (0.3 pounds).