This 120GB Xbox 360 hard drive allows enough space for a whole library of Xbox LIVE Arcade games as well as downloadable high-definition TV shows, movies, music, and all the other content available from Xbox LIVE Marketplace.
Following details from Argos website:
:- Includes a data transfer kit to easily migrate all of your saved data from your current disk drive to your new 120GB HDD.
:- Comes preloaded with great HD game demos, videos and an assortment of Xbox Live Arcade game trials.
*Yes, I know it's expensive for memory and you can find a PC hard drive for 50p but still for a new Xbox hard drive it's one of the cheapest I can find.