Updating optical disk storage

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, a laser beam encodes digital data onto an optical, or laser, disk in the form of tiny pits arranged in concentric tracks on the disk’s surface.

A low-power laser scanner is used to “read” these pits, with variations in the intensity of reflected (compact disc read-only memory), which can store text and images as well as sound; in WORM (write-once read-many), a type of disk that can be written on once and read any number of times; and in newer disks that are totally rewritable.

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The most common types of optical media are Blu-ray, CDs, and DVDs.

Russell, stored data as micron-wide dots of light and dark.

A laser read the dots, and the data was converted to an electrical signal, and finally to audio or visual output.

Multimedia encyclopedias, video games, training programs, and directories are commonly stored on optical media.

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