UCB (Unit Control Block)a control block in storage that describes the characteristics of a particular I/O device on the operating system.
UDPUser Datagram Protocol, the typical way to send datagrams over the Internet.
UIDA user ID. Often used in the context of "file" or "process" ownership.
UnicodeA 16-bit character set designed to make it easier to exchange and display information that makes use of a wide range of different languages and symbols.
Unified Block and File ArchitectureThe ability of Adaptec's iSCSI-enabled GuardianOS Snap Servers to store block and file data simultaneously on a single storage device.
uninterruptible power supply (UPS)Backup power supply that is available when the electrical power fails or drops to unacceptable levels.
unique streamA stream whose connection speed, media type, or thinning parameters are different from another stream that is part of the same streaming media…
UNIX credThe credential used to validate requests when accessing files with UNIX-style security.
UNIX permissionsThe bits used in UNIX-style security to control access to files and directories.
unmountTo make the file system on a particular device inaccessible by detaching it from the file hierarchy.
User Datagram Protocol (UDP)A connectionless network protocol that provides simple but unreliable transmission. An alternative to TCP that does not contain error checking.
user ID (UID)Any numerical identifier for users in a computer system.
user mappingA method of assigning identities between UNIX and NTFS, where one identity is mapped to another.
UTFUniversal Character Set (UCS) Transformation Format. A format for representing multibyte characters that is compatible with programs and file systems that…