Western Digital Caviar Black 640GB hard drives (WD6401AALS, 20-pack) deliver 7200 RPM performance in a standard 3.5-inch form factor. Each drive features SATA 3Gbps connectivity, 32MB cache, and is rated for sustained 7200 RPM operation suitable for desktop workstations and lower-capacity storage applications. The 20-pack quantity makes these drives appropriate for volume deployments, workstation refresh cycles, or inventory stock. Compatible with standard SATA II slots in servers, storage enclosures, and desktop systems from the mid-2000s onward. Typical use cases include legacy system refresh, test lab environments, or capacity supplementation in environments where newer SATA III or SSD solutions are not required. Each drive tested and guaranteed. Available via quote.
