Apple part number 661-6372 is a 500GB 7200RPM 2.5-inch SATA hard drive designed for MacBook Pro 15-inch models from the mid-2009 through mid-2012 generation. The drive features a standard 9.5mm form factor and SATA II interface, delivering up to 3Gb/s throughput typical of mechanical drives from this era. Compatible with MacBook Pro 15" unibody designs, it serves as a direct replacement for original factory drives or upgrades from slower 5400RPM units, suitable for users requiring additional storage or drive replacement due to failure or wear.Installation requires basic disassembly of the MacBook Pro bottom case and logic board bracket; detailed guides are widely available for this common procedure. The refurbished unit has been tested and is guaranteed to function to specification. Available via quote from G5 Network Group.