Hp Surestore 5200ex series Optical Disk Drives Manuel d'utilisateur télécharger pdf (Page 75)

Glossary Glossary-1

Glossary

C-D

cartridge A plastic enclosure that

contains an optical disk. The cartridge

is labeled "A" or "B" to denote separate

sides of the optical disk. The optical

disk is never removed from the

cartridge.

disk See optical disk.

driver A program that allows the

operating system to communicate with a

peripheral device.

M-O

magneto-optical A type of optical

technology which uses a laser to read

from and write to a magnetic layer on an

optical disk. To write, a spot on the

magnetic layer is heated by a laser to a

point where it can be magnetically

altered by the write magnetic head. To

read, a light from the laser is reflected

from the spot. The magnetic alteration

causes the reflected light to be polarized

in one direction (interpreted as a "1") or

the opposite direction (interpreted as a

"0").

multifunction drive An optical disk

drive that supports both rewritable and

write-once optical disks. The drive

detects the disk type by reading a

factory-stamped code on the disk, and

automatically determines whether to

operate in rewritable or write-once

mode.

optical disk A term synonymous with

the 5.25-inch magneto-optical disk.

There are two types of optical disks used

in jukeboxes: rewritable and write-once.

R-T

rewritable optical An optical disk

technology in which data can be

repeatedly written using magneto-

optical reading and writing technology.

SCSI An acronym for the Small

Computer Systems Interface.

terminator A resistor array device used

for electrically terminating a SCSI bus.

A SCSI bus must be terminated at its

two physical ends. A peripheral device

uses a terminator only if it is at the end

of the bus.

W

write-once An additional operating

mode available with multifunction

drives. When a write-once disk is

inserted, the drive will write data, but

will not write over data that has been

previously written. This feature is

useful for applications that need

permanent data security and audit trails.

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