HP 7951 (LA), 6842 (LA), 6849 (LA), 7950 (US/CAN) Additional CD-R/RW area of a CD-R and -RW disc

01_LAYOUT_GB 22-11-2000 09:21 Pagina 20

CDRWAPPENDIXIX

(CONT )

ENGLISH

•Onto this a special greenish tinged translucent layer is applied. The substrate has already been provided with a preformed track spiral into which the data will be written during recording.

•On top of the green recording layer is a reflective gold layer and a protective layer of plastic material.

The additional CD-R/RW area of a CD-R and -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 via a trial recording.

A CROSS-SECTION THROUGH A BLANK CD-R OR -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 -RW disc.

max. 60 mm

max. 59 mm

22.35 mm

7.5mm

mechanical clamping

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