Buffalo LinkStation Mini 1TB

This is a NAS but a small one. It is fitted with two 2.5in 500GB disks, making it about the same width and length as a regular 2.5in portable hard drive - about twice the height.

It connects via an Ethernet port - all three speeds available (10, 100 or 1000) and has a USB interface. No fan but it has air vents on 3 sides of the case. It can be configured Raid 0 (striped) or Raid 1 (mirrored). It also has an iTunes server, DNLA compliant media server and a print server.

It is easy to set-up using the out of the box software - current price around £300.