Universal Media Disc
The Universal Media Disc (UMD) is an optical disc made by Sony which is used on their PlayStation Portable. It holds 1.8 gigabytes of data. The disc can store games, music and video along with updates for the PSP. To prevent illegal copying, the manufacturer does not make blank discs available for sale. This disc is not used with any other devices. Also, the UMD is a very fragile cd, and can be broken from misuse.
