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. ...

Get Sound Engineer's Pocket Book, 2nd Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.