IBM T400F C. See Celsius, cartridge. See tape cartridge, data compression. See compression

C

C.See Celsius.

capacity. The amount of data that can be contained on storage media and expressed in bytes.

cartridge. See tape cartridge.

cartridge door. On a tape cartridge, the hinged barrier that can be opened to access, or closed to protect, the magnetic tape within the cartridge.

cartridge manual rewind tool. A device that can be fitted into the reel of a cartridge and used to rewind tape into or out of the cartridge.

cartridge memory. See LTO cartridge memory.

Celsius. Having a thermometric scale on which the interval between the freezing point and the boiling point of water is divided into 100 degrees, with 0° representing the freezing point and 100° representing the boiling point.

channel calibration. A feature of the Ultrium 2 Tape Drive by which it automatically customizes each read/write data channel to compensate for variations in such things as the recording channel’s transfer function, the media, and characteristics of the drive head. Channel calibration optimizes system performance.

circuit board. A thin sheet on which chips and other electronic components are placed. Computers consist of one or more boards, often called cards or adapters.

cleaning cartridge. A tape cartridge that is used to clean the heads of a tape drive. Contrast with data cartridge.

clockwise. In the direction that the hands of a clock rotate, as viewed from the front.

command time-out.Following the issuance of a command, a period of time during which it is determined that there is a bad connection between the server and the drive.

compression. The process of eliminating gaps, empty fields, redundancies, and unnecessary data to shorten the length of records or blocks.

configure. To describe to a server the devices, optional features, and programs installed on the system.

contiguous. Touching along a boundary or at a point.

core. The light-conducting central portion of an optical fiber. The core is composed of material that has a higher index of refraction than the cladding (the material that surrounds the core).

counterclockwise. In a direction opposite to that in which the hands of a clock rotate, as viewed from the front.

current. The quantity of charge per unit of time. Current is measured in amperes.

cycle power. To apply and remove electrical power to a device within a short time span.

D

data. Any representations such as characters or analog quantities to which meaning is, or might be, assigned.

data cartridge. A tape cartridge that is dedicated to storing data. Contrast with cleaning cartridge.

data compression. See compression.

data transfer rate. The average number of bits, characters, or blocks per unit of time that pass between corresponding equipment in a data transmission system. The rate is expressed in bits, characters, or blocks per second, minute, or hour.

dc. Direct current.

degauss. To make a magnetic tape nonmagnetic by exposing the tape to electrical coils which carry currents that neutralize the magnetism of the tape.

device. Any hardware component or peripheral, such as a tape drive or tape library, that can receive and send data.

device driver. A file that contains the firmware that is needed to use an attached device.

diagnostic. A software program that is designed to recognize, locate, and explain faults in equipment or errors in programs.

diagnostic cartridge. A tape cartridge that enables the detection and isolation of errors in programs and faults in equipment.

direct current (dc). An electric current flowing in one direction only and substantially constant in value.

director-class switch. A high-end switch that includes such qualities as fault tolerance, high throughput, high reliability, port density, and so forth.

drive. See IBM TotalStorage LTO Ultrium 2 Tape Drive.

drive dump. The recording, at a particular instant, of the contents of all or part of one storage device into another storage device, usually as a safeguard against faults or errors, or in connection with debugging.

106IBM TotalStorage LTO Ultrium 2 Tape Drive