Microsoft plans to offer an HD-DVD high-definition optical disc drive for the Xbox 360 as an optional extra later this year, it revealed at the International Consumer Electronics Show (CES) in Las Vegas.

The move matches Sony, which will include a competing Blu-Ray drive in its PlayStation 3.

Microsoft declared its support for HD-DVD last year before the Xbox 360 was launched. At the time Bill Gates, Microsoft's chairman and chief software architect, said HD-DVD wouldn't make it into the launch player but might play a part in the future of the console.