Buyers were generally put off by the high price of UMD releases, which often retailed at comparable prices to but lacked the extra content found on DVDs. The UMD format never saw implementation on any device other than the PlayStation Portable, and as a result the market was very limited compared to those for other optical media formats. UMDs offer large capacity and the capability to store quality audio/video content however, the format's proprietary nature and the lack of writers and blank media made adoption difficult.
Unlike the current clamshell loading design the PSP uses, a slot loading device using an Auto-Loading mechanism would be motorized and completely automatic. It would also be similar to the Sony U-Matic auto-loading mechanism. These would be very similar to the auto-loading mechanism used in slot loading MiniDisc home and car decks.
The BBC released a number of its programmes on UMD in the UK, including The Office, The Mighty Boosh, Doctor Who and Little Britain. The American punk rock band The Offspring released their Complete Music Video Collection on the format. Video stored on UMD is typically encoded in 720×480 resolution, but is scaled down when displayed on the PSP. The video is encoded in the H.264/MPEG-4 AVC format, with the audio in ATRAC3plus or PCM. 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. High-Definition Versatile Multilayer Disc (HD VMD).
HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM.Blu-ray Disc ( BD): BD-R & BD-RE, Blu-ray 3D, Mini Blu-ray Disc.DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-R DS, DVD+R DS, DVD-RW, DVD+RW, DVD-RAM, DVD-D, DVD-A, HVD, EcoDisc, MiniDVD.Compact disc ( CD): CD-DA, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, Super Audio CD ( SACD), Photo CD, CD Video ( CDV), Video CD ( VCD), Super Video CD ( SVCD), CD+G, CD-Text, CD-ROM XA, CD-i, MIL-CD, Mini CD.