Universal Media Disc. Sony
's new type of CD
that is the medium for it's new handheld, the PSP
. It is about half the size of a DVD
. Since it is the medium for a portable console, it has a plastic case covering it with a small opening for the laser to read it. Sony will also release movies on it. At this current time it is unknown of it will be regionally encoded like DVD
s or if any other device besides the PSP
will be able to play them.