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U
UDF

UDF/ISO
UOP
UPnP
USB, USB2



U
UDF
One of the major achievements of DVD is that it has brought all the conceivable uses of CD for data, video, audio, or a mix of all three, within a single physical file structure called UDF, the Universal Disc Format. Promoted by the Optical Storage Technology Association (OSTA), the UDF file structure ensures that any file can be accessed by any drive, computer or consumer video. It also allows sensible interfacing with standard operating systems as it includes CD standard ISO 9660 compatibility. UDF overcomes the incompatibility problems from which CD suffered, when the standard had to be constantly rewritten each time a new application like multimedia, interactivity, or video emerged.

The version of UDF chosen for DVD-Video to suit both read-only and writable versions - is a subset of the UDF Revision 1.02 specification known as MicroUDF (M-UDF).

Because UDF wasn't supported by Windows until Microsoft shipped Windows 98, DVD providers were forced to use an interim format called UDF/ISO (UDF Bridge).

UDF has been revised and now appears in revisions 1.02, 1.5, and 2.0.
Burnworld - Disctronics




UDF/ISO
Also called UDF bridge, UDF/ISO is a hybrid filesystem utilizing UDF and ISO 9660. Developed because UDF wasn't supported by Windows until Microsoft shipped Windows 98, DVD providers were forced to use an interim format. Windows 95 OSR2 supports UDF Bridge, but earlier versions do not. As a result, to be compatible with Windows 95 versions previous to OSR2, DVD vendors had to provide UDF Bridge support along with their hardware.

DVD-ROM discs use the UDF Bridge format. (Note: Windows 95 was not designed to read UDF but can read ISO 9660). The UDF Bridge specification does not explicitly include the Joliet extensions for ISO 9660, which are needed for long filenames. Windows 98 and later MS operating systems read UDF so these systems have no problem with either UDF or long filenames. Burnworld




UOP
User Operation Prohibitions. Settings that prevent the viewer from skipping or fast-forwarding certain parts of DVDs.




UPnP
Universal Plug and Play (UPnP) is a set of computer network protocols. The goals of UPnP are to allow devices to connect seamlessly and to simplify the implementation of networks in the home (data sharing, communications, and entertainment) and corporate environments. UPnP AV MediaServers store and share digital media, such as photographs, movies, or music. These media servers use the Universal Plug and Play (UPnP) protocols to communicate with other devices. UPnP MediaServers software Tversity, XBMC, MythTV, Windows Media Connect.




USB, USB2
Universal Serial Bus is the solution for all PC users who want an instant, no-hassle way to connect new hardware like digital joysticks, scanners, digital speakers, digital cameras or a PC telephone to their computer. USB makes adding peripheral devices extremely easy. With USB-compliant PCs and peripherals, you just plug them in and turn them on. USB 2.0 (USB2) is the latest USB technology. This technology is approximately forty times faster than the previous USB 1.1 technology, increasing the speed of the device to PC connection from 12Mbps on USB 1.1 to up to 480Mbps on USB 2.0. usb-ware.com.










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