WD Caviar Blue 500GB 3.5-inch hard drive (part WD5000AAKX-083CA0) delivers 7200 RPM performance with SATA 6Gb/s interface and 16MB cache for reliable sequential and random access in enterprise storage arrays, NAS systems, and high-capacity external enclosures. Designed for continuous-duty operation in small-to-medium workgroups, this drive provides standard reliability for archival, backup, and general-purpose file storage. Backward compatible with SATA 3Gb/s systems. Typical use cases include external storage solutions, secondary storage tiers, and replacement drives for existing 3.5-inch SATA bay systems. Tested and guaranteed; available via quote.