WD Blue Notebook 500GB SATA 3.0 Gb/s 2.5-Inch Internal Notebook Hard Drive Retail Kit Includes free cloning software 2.5- Inch SATA hard drive and SATA 3 Gb/s interface. Reliable and rugged - ShockGuard technology protects the drive mechanics and platter surfaces from shocks WhisperDrive technology combines state-of-the-art seeking algorithms to yield one of the quietest 2.5-inch hard drives on the market. 2 year limited warranty Massive capacity Low power consumption Ultra-cool and quiet