The WD Blue WD60EZAZ 6TB is a 3.5-inch internal hard drive that you can use to expand the storage capacity of your desktop PC. This hard drive has a cache of no less than 256MB, so frequently used files will load much faster. This is a lot more than the 64MB of its predecessor. The drive has a 6TB capacity, which is enough for 600 movies of 10GB, for example. You can transfer a 10GB movie to your drive in less than a minute. This is possible because of the read and write speed of 180MB per second. Thanks to dual-plane balancing, the drive corrects itself. This reduces vibrations, makes the drive more silent, and makes it last longer.