Hard Disk       Product Picture         Product Information   SKU # HDWD4000AAKS     Manufacturer Western Digital     Features FAST 16 MB cache - Keeps more of your data in high-speed memory for unsurpassed performance in its class. Fast 7200 RPM spindle speed and SATA for burst transfer rates up to 300 MB/s. COOL Cool operation results in the highest reliability, even in intensely hot environments such as digital video recorders. That's why these, the coolest on the market, are the drives of choice for the world's leading consumer electronics and PC manufacturers. QUIET The technology that Tom's Hardware Guide called "very fast and nearly silent" is used throughout this family of drives. Its WhisperDrive™ technology minimizes noise to levels near the threshold of human hearing. To cut seek noise, SoftSeek™ technology streamlines read/write seeking algorithms, resulting in more efficient operation.     Specifications   Capacity 400 GB Interface SATA 300 Data Transfer 300 MB/sec Access Time 8.9ms RPM 7200 Buffer 16 MB Dimensions 1" x 4" x 5.75" ( H x W x D)