GENERAL KNOWLEDGE

Detailed explanation-1: -Standard CDs have a diameter of 120 millimetres (4.7 in) and are designed to hold up to 74 minutes of uncompressed stereo digital audio or about 650 MiB of data.

Detailed explanation-2: -compact disc (CD), a molded plastic disc containing digital data that is scanned by a laser beam for the reproduction of recorded sound and other information. Since its commercial introduction in 1982, the audio CD has almost completely replaced the phonograph disc (or record) for high-fidelity recorded music.

Detailed explanation-3: -The CD format was originally developed for storing and playing sound recordings but was later adapted for storing data. Data on a CD is encoded with the help of a laser beam that etches tiny indentations (or bumps, if you will) on its surface. A bump, in CD terminology, is known as a pit and represents the number 0.

Detailed explanation-4: -In 1979, the Dutch company Philips, along with Sony, developed and trademarked the compact disc using the “c” spelling. The “c” spelling is now used consistently for optical media such as the compact disc and similar technologies.