With 500 GB of storage, this is a good HDD drive if you need a larger storage unit. It has a 5 400 rpm rotation speed.
From Amazon
WD Blue 500 GB internal mobile hard drive (6mm height 5400rpm SATA 6Gb/s 8MB cache 6.4 cm 2.5 inches) RoHS compliant internal
AA2Z Supply
WESTERN DIGITAL WD5000LPCX WD BLUE 500GB 5400RPM SATA-6GBPS 16MB BUFFER 2.5INCH 7MM HARD DRIVES. BULK. .