Microsoft is bumping up the size on the external hard drive accessory for the Xbox 360 to 250 GB. The downside? It's only available in Japan...so far. Normally only sold as a part of a bundle with a new Xbox 360 gaming console, interested gamers will have the option to buy the larger hard drive as a stand-alone accessory. Set to be release in Japan on March 11, the new storage space key will cost ¥15,540 which is around $172 / £108. Alternatively you could just have a look at the Digiex guide: How to hack a 250gb sata drive to work in the Xbox 360 and upgrade your existing drive to a nice 250gb drive for around $50 / £30.