26
ASUS CD-R/RW Drive User’s Manual
VI. APPENDIX
VI.
Appnedix
CD-R/R
W
Disc
The Additional CD-R/RW Area
of a CD-R and CD-RW Disc
The additional CD-R/RW area is divided into two areas:
•
The Program Memory Area (PMA) which mainly contains the track numbers of
the tracks recorded with respective start and stop points.
•
The Program Calibration Area (PCA). Disc space for the CD writer to calibrate
the laser energy needed for recording on the disc by means of a trial recording.
A Cross-section: Blank CD-R or CD-RW Disc
Next to the centre hole is an area for the mechanical clamping of the disc in the
player. Adjacent to this is the unrecorded area of the blank CD-R or CD-RW disc.
A Cross-section: Partially Recorded CD-R or CD-RW Disc
After the first recording the recording area is divided (see figure below).
max. 60mm
max. 59mm
22.35mm
7.5mm
CENTER
HOLE
AREA FOR
MECHANICAL
CLAMPING
BLANK AREA FOR RECORDING
•
The “Lead-in”, “program area” and “Lead-out” areas are present on every
conventional prerecorded CD.
•
For the partially recorded CD-R or CD-RW disc, the PCA and PMA areas
are incorporated in front of the Lead-in.
•
Track numbers with associated absolute start and stop times are stored in
the PMA.
max. 60mm
max. 59mm
25.00mm
23.00mm
22.35mm
CENTER
HOLE
RECORDED AREA
UNRECORDED AREA
PCA PMA
LEAD-
IN
LEAD-
OUT