Western Digital BLUE WD5000AAKX 500GB 7200RPM 6Gb/s 3.5" SATA 16MB Hard Drive

Model Number: WD5000AAKX. Buffer (cache) Size: 16MB. Rotational Speed: 7200RPM. Interface Type: 3.5" SATA 6Gb/s. Capacity: 500GB. Arduino module. Motor Drive Module. DRIVE/WIRE Stepper motor.

eBay