£60 Samsung M7 640GB 2.5 inch

The Spinpoint M7 utilizes Samsung's proprietary SilentSeek and NoiseGuard technologies to minimize the noise-level of the mechanical drive operation.

The halogen-free drive complies with the European Union's Restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS) regulations.

This hard disk drive, otherwise known as the M7E, comes with a capacity of 640GB with a SATA 3.0 interface, 8MB Buffer and a rotational speed of 5400RPM. It has an average seek time of 12ms and a maximum data transfer rate of 138Mbps.

You can buy this from Amazon for only £60 including VAT and delivery.