Western Digital WD6400AAKS Internal Hard Drive

WD6400AAKS is a 640GB 3.5-inch internal hard drive from Western Digital’s Caviar Blue lineup. It spins at 7200 RPM and includes 16MB of cache, delivering faster data access and improved sequential transfers for desktop workloads. The drive uses a SATA II interface (3.0 Gbps), making it compatible with a wide range of desktop motherboards that support 3.5-inch HDDs. With 640GB of storage, it’s suitable for housing an operating system, applications, and a media library, or serving as a secondary storage drive in a home or small-office PC. As a standard desktop HDD, it fits upgrades to existing desktops, NAS enclosures that support 3.5-inch drives, and other systems requiring reliable SATA-connected storage. The WD6400AAKS model is widely listed by retailers as a 640GB, 7200 RPM, 16MB cache drive within the Caviar Blue family, reflecting Western Digital’s mainstream desktop storage lineup. When installing, ensure your system has a 3.5-inch drive bay and a SATA II interface to maximize compatibility and performance.