Western Digital Caviar Blue 500GB internal hard drive, model WD5000AAKX-753CA1. This 3.5-inch desktop drive features a SATA interface and a 7200 RPM spindle speed. Manufactured in October 2011, it includes the original control board and casing. Please note this unit is being sold strictly for parts or repair as it is a non-working drive. Ideal for data recovery professionals or hobbyists seeking specific mechanical or electronic components.