The Universal Media Disc (UMD) is a discontinued optical disc medium developed by Sony for use on its PlayStation Portable handheld gaming and multimedia platform. It can hold up to 1.8 gigabytes of data and is capable of storing video games, feature-length films, and music. UMD was the trademark of Sony Computer Entertainment for their optical disk cartridge (ODC). Video storage format While the primary application for UMD discs is as a storage medium for PSP games, the format is also used for the storage of motion pictures and, to a lesser degree, television shows for playback on the PSP. The video is encoded in the H.264/MPEG-4 AVC format, with the audio in ATRAC3plus or PCM. Video stored on UMD is typically encoded in 720×480 resolution, but is scaled down when displayed on the PSP. The American punk rock band The Offspring released their Complete Music Video Collection on the format. The BBC released a number of its programmes on UMD in the UK, including The Office, The Mighty Boosh, Doctor Who and Little Britain. WWE also released some wrestler highlights and documentary content on UMD format, such as The Monday Night Wars, Jake "the Snake" Roberts: Pick Your Poison, and WWE Raw Homecoming (a special episode of WWE Raw celebrating the return to USA Network); the only WWE pay-per-view released on UMD format was WrestleMania XXIV. Tupac's performance, Live at the House of Blues, was also released on the UMD, which also included several music videos, including Hit 'Em Up. Some adult films have been released on UMD in Japan. Specifications ECMA-365: Data Interchange on 60 mm Read-Only ODC – Capacity: 1.8 GB (UMD) Dimensions: approx. 64 mm (diameter) × 4.2 mm (thickness) Maximum capacity: 1.80 GB (dual layer), 900 MB (single-layer) Laser wavelength: 660 nm (red laser) Numerical aperture: 0.64 Track pitch: 0.70 μm Minimum pit length: 0.1384 μm Modulation: 8-to-16 RLL(2,10) Encryption: AES 128-bit The case dimensions for UMD discs are 177×104×14mm. Provisions According to the official ECMA specification Sony designed the UMD to support two possible future enhancements and products. Protective Shutter: Similar to the MiniDisc and 3-inch floppy disk, this protective shutter would shield the inner disc from accidental contact. Auto-Loading: UMDs were designed for possible future slot loading devices with Auto-Loading mechanisms. These would be very similar to the auto-loading mechanism used in slot loading MiniDisc home and car decks. It would also be