| | Featured Article
Facts about CDs
Facts about CDs:
Available on the market since late 1982
They have lost ground in recent years to MP3 players
Standard CDs have a diameter of 120 mm and can hold approximately 80 minutes of audio.
The technology was later adapted to include record-once and re-writable media (CD-R and CD-RW respectively).
A Compact Disc is made from a 1.2 mm thick disc of almost pure polycarbonate plastic and weighs approximately 16 grams.
CD-ROM Data Capacity: 650 - 703 MB
By 2007, 200 billion CDs had been sold worldwide
Physical parameters:
Scanning velocity: 1.2 - 1.4 m/s (constant linear velocity) equivalent to approximately 500 rpm at the inside of the disc, and approximately 200 rpm at the outside edge. (A disc played from beginning to end slows down during playback.)
Track pitch: 1.6 µm
Disc diameter 120 mm
Disc thickness: 1.2 mm
Inner radius program area: 25 mm
Outer radius program area: 58 mm
Center spindle hole diameter: 15 mm
Copyright © 2005 Sale on all blank media. All rights reserved. |
| |