Emulate:
To test the function of a disc on a computer after formatting a co
plete disc image.
Enhanced CD:
A CD-ROM disc contains only data sectors as defined in the
Yellow Book.
Hard Drives:
Originally known as Winchester drives, these magnetic storage
devices have one or more non-removable solid platters--as op-posed to the
floppy-disk drives. Hard drives come in various types, different capacities
and configurations--and are connected to the bus through a controller or
interface card. There are removable hard drives, which allow removal of the
component that contains the platters--a workable option for users with
security concerns.
HDCD:
High-definition Compatible Digital. A proprietary method of enhancing
audio on CDs.
Hz:
Hertz. A unit of frequency measurement. The number of cycles (repeti-
tions) per second.
Karaoke:
Literally, empty orchestra. The social sensation from Japan where
people sing along to a music track. Karaoke was largely responsible for the
success of laserdisc in Japan, thus supporting it elsewhere.
Master:
The metal disc used to stamp replicas of optical discs. The tape used to
make additional recordings.
Mode:
Under the ISO 9660, a CD-ROM sector can be Mode 1 or Mode 2.
Mode 1 allocates2048 bytes for user data, plus a third layer of error detec-
tion and error correction codes. This is the Mode that provides the highest
integrity for computer data.
Mode 2 allocates 2336 bytes for user data, and no third layer of error
detection and error correction. This mode is considered appropriate for seg-
ments of music, graphics and video, especially in CD-ROM-XA and CD-I
implementations.
Multimedia:
Information in more than one form, such as text, still
images, sound, animation, and video. Usually implies that the informa-
tion is presented by a computer.
Track-At-Once:
With Track-at-Once writing mode, a CD-Recorder will record one
track at a time. In between every two tracks (unless you are only recording
a single track). The CD-Recorder laser will stop while the hard disc prepared
for the contents of the next track. Each time the laser is stopped, it writes
Run-Out blocks. When starting again, it writes Run-In blocks (a total of 7
blocks).These are ignored by CD-ROM readers and so do not disturb data
transmission, but in some audio players you might hear a click between
tracks. This is why disc-at-Once recording is preferable for audio discs.
Wave:
A Wave file (.WAV) is a type of sound file which stores digitized analog
signals.
Yellow Book:
The book which sets out the standard developed by Philips and
Sony for the physical format of compact discs to be used for information
storage (CD-ROM).
14
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