18 Compact Disc
CD parameters
Disc diameter |
120 mm |
Rotation speed |
568–228 r.p.m. (at 1.4 m/s) |
|
486–196 r.p.m. (at 1.2 m/s) |
Playing time (max) |
74 min |
No. of tracks |
20 625 |
Track spacing |
1.6 μm |
Lead-in diameter |
46 mm |
Lead-out diameter |
116 mm |
Total track length |
5300 m |
Linear velocity |
1.2 or 1.4 m/s |
The CD Track
See Figure 92.
Figure 92 Track and pit dimensions
Stages in the ‘cutting’ of a CD
See Figure 93.
Figure 93 Stages in the production of CD masters and mothers
1. Glass plate is polished for maximum smoothness. ...
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