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English: Comparison of various characteristics of a Compact Disc, and single-layer Digital Versatile Disc, High-Definition/Density Digital Versatile Disc and Blu-ray Disc. Dimensions indicated are track pitch (p), pit width (w) and minimum length (l), and laser spot size (⌀) and wavelength (λ).
English: Universal Media Disc, Minidisc and Compact Cassette - size comparison. The UMD was a very short lived format, and was an optical disc of about 1.8Gb capacity in a protective plastic case. It was the storage of choice for the Sony PSP which was their hand held Playstation. It was retired fairly swiftly.
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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.
The White Book refers to a standard of compact disc that stores pictures and video. CD-i Bridge [ 18 ] - a bridge format between CD-ROM XA and the Green Book CD-i , which is the base format for Video CDs , Super Video CDs and Photo CDs .
Drives may slot into a drive bay of the corresponding size. Compared to flash drives in same form factor, maximum rotating disk drive capacity is much smaller, [citation needed] with 100 TB available in 2018, [1] and 32 TB for 2.5-inch. [2] The disk drive size, such as 3.5-inch, is usually refers to the diameter of the disk platters.
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An early analogue optical disc system existed in 1935, used on Welte's Lichttonorgel sampling organ. [15] An early analog optical disc used for video recording was invented by David Paul Gregg in 1958 [16] and patented in the US in 1961 and 1969. This form of optical disc was a very early form of the DVD (U.S. patent 3,430,966).