Что такое компакт диск

 

Parameter

Value

Comments

Diameter: 12 (or 8) cm 8 cm CDs have not been successful
Thickness: 1.2 mm Tolerance of +0.3, -0.1 mm
Width of pits: 0.5 microns  
Length of pits: 0.8 to 3 microns Depends on data stored
Depth of pits: 0.15 microns  
Scan velocity: 1.3 m/s Tolerance +/- 0.1 m/s
Track pitch: 1.6 microns Tolerance +/- 0.1 microns
Laser wavelength: 770 to 830 nm Typically 780 nm
Playing time: 74 mins 44 secs Playing times can be longer
Number of tracks: 99 max Can use indexes to subdivide tracks
Modulation EFM 8 to 14 bits plus 3 merging bits
Channel bit rate: 4.3218 Mb/s Actual raw data rate

 

 

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