A type of data redundancy that uses a set of physical drives to store data and a single, additional drive to store parity data. Using guarding, the user’s data is protected from the loss of a single drive. Guarding is sometimes preferred over mirroring because it is more cost effective in systems with a very high storage capacity. However, guarded configurations are significantly slower for application programs that frequently write to the array, because each attempt to write to the array requires multiple read and write commands to maintain the parity information. If this is a problem, mirroring or duplexing is a better choice. See also mirroring, RAID 4, and RAID 5.
A type of data redundancy in which a set of physical drives stores data and an additional drive stores parity data. See also mirroring, striping, and RAID. — Hexadecimal. A base-16 numbering system, often used in programming to identify addresses in the system's RAM and I/O memory addresses for devices. In text, hexadecimal numbers are often followed by.