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An optical disc is a flat, usually [note 1] disc-shaped object that stores information in the form of physical variations on its surface that can be read with the aid of a beam of light. Optical discs can be reflective, where the light source and detector are on the same side of the disc, or transmissive, where light shines through the disc to ...
CD-R (Compact disc-recordable) is a digital optical disc storage format. A CD-R disc is a compact disc that can only be written once and read arbitrarily many times. CD-R discs (CD-Rs) are readable by most CD readers manufactured prior to the introduction of CD-R, unlike CD-RW discs.
In later years, the compact disc was adapted for non-audio computer data storage purposes as CD-ROM and its derivatives. First released in Japan in October 1982, the CD was the second optical disc technology to be invented, after the much larger LaserDisc (LD). By 2007, 200 billion CDs (including audio CDs, CD-ROMs and CD-Rs) had been sold ...
The disc may be rectangular with wings added on, to square off the rounded 80 mm disc. 60 mm disc , a round version of the business card, with comparable capacity (50 MB) In 1997, Dean Procter of Imaginet was offering business card sized square CDs with full screen hi-fi stereo video which played in quad speed CD-ROM or DVD drives with the ...
In the history of optical storage media there have been and there are different optical disc formats with different data writing/reading speeds.. Original CD-ROM drives could read data at about 150 kB/s, 1× constant angular velocity (CAV), [1] the same speed of compact disc players without buffering.
A magneto-optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto-optical disc. 130 mm (5.25 in) and 90 mm (3.5 in) discs are the most common sizes. In 1983, just a year after the introduction of the compact disc , Kees Schouhamer Immink and Joseph Braat presented the first experiments with erasable ...
The Blue Book is a compact disc standard that defines the Enhanced Music CD format, which combines audio tracks and data tracks on the same disc. E-CD/CD+/CD Extra ( Enhanced ) [ 21 ] – a standard jointly developed and published by Microsoft , Philips and Sony
M-DISC's design is intended to provide archival media longevity. [3] [4] M-Disc claims that properly stored M-DISC DVD recordings will last up to 1000 years. [5]The M-DISC DVD looks like a standard disc, except it is almost transparent with later DVD and BD-R M-Disks having standard and inkjet printable labels.