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The WD® Caviar RE2 WD1601ABYS 3.5" internal hard drive in black/silver color, houses the hard disk, where all your files and folders are physically located. It is the primary storage device located inside a computer system and contains pre-installed software applications, the operating system and other files. This hard drive has 160GB of storage capacity and 7200-RPM spindle speed. It features 3 Gbps SATA interface for fast execution and easy installation. It also features 16MB of cache memory that offers quicker access to your data.