Computer Glossary U

UDMA Ultra DMA. Data transfer system for drives. Supports transfer rates of 33MBps (megabytes per second), 66MBps and 100MBps – hence the terms UDMA33, UDMA66 and UDMA106.

Universal Plug and Play Often shortened to UPnP, this is an extension of the PnP (plug and play) standard which uses internet protocols to make a PC recognise when new devices have been attached to it.

URL unique resource locator. The address of a web page, such as http://www.onekilobyte.com.

USB universal serial bus. A plug and play interface on a PC allowing devices to be connected and used without any need for configuration by the user. USB supports up to 127 devices and speeds of 12Mbps (megabits per second) and allows devices to be removed or added without switching off the PC first.

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