Glossary - U

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Ultra DMA	A protocol developed that supports burst mode data transfer rates of up to 33.3 MBps. This is twice as fast as older disk drive standard for PCs, and is necessary to take advantage of new, faster Ultra ATA disk drives.
UNC	Also known as Uniform Naming Convention, are paths that specify the name of a computer and a directory or resource to be accessed. The name of the computer is prefaced with two backslashes, while the directory is prefaced with the traditional one backslash. Here's an example: \\SERVER1\SHARENAME.
Unrecoverable Error	A read error which falls outside of the ability of an ECC mechanism to correct it.
URL	Also known as Uniform Resource Locator, is the global address of documents and resources on the World Wide Web. In general this term is used to describe a web page or site.
USB	Universal Serial Bus is a connection port on a computer that is universally compatible with many different types of devices, such as iPOD, printers, speakers, etc.