Startrak ze 7000 plus software4/4/2023 ![]() ![]() ![]() Capacity is routinely extended to 80 minutes and 700 MB by arranging more data closely on the same sized disc. The Mini CD has various diameters ranging from 60 to 80 millimetres (2.4 to 3.1 in) they are sometimes used for CD singles, storing up to 24 minutes of audio, or delivering device drivers.Īt the time of the technology's introduction in 1982, a CD could store much more data than a personal computer hard disk drive, which would typically hold 10 MB. By 2010, hard drives commonly offered as much storage space as a thousand CDs, while their prices had plummeted to commodity level. In 2004, worldwide sales of audio CDs, CD-ROMs, and CD-Rs reached about 30 billion discs. By 2007, 200 billion CDs had been sold worldwide. The pits in a CD are 500 nm wide, between 830 nm and 3,000 nm long and 150 nm deep.Ī CD is read by focusing a 780 nm wavelength ( near infrared) semiconductor laser through the bottom of the polycarbonate layer. ![]() The change in height between pits and lands results in a difference in the way the light is reflected. ![]()
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