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Compact disc (CD), an optical disc used to store digital data (700 MB storage) Compact Disc Digital Audio (CD-DA), a CD that contains PCM encoded digital audio in the original "Red Book" CD-DA format; 5.1 Music Disc, an extension to the Red Book standard that uses DTS Coherent Acoustics 5.1 surround sound
The first erasable optical disc drives were announced in 1983, by Matsushita (Panasonic), [54] Sony, and Kokusai Denshin Denwa (KDDI). [55] Sony eventually released the first commercial erasable and rewritable 5 + 1 ⁄ 4-inch optical disc drive in 1987, [53] with dual-sided discs capable of holding 325 MB per side. [54]
The data are stored on the disc with a laser or stamping machine, and can be accessed when the data path is illuminated with a laser diode in an optical disc drive that spins the disc at speeds of about 200 to 4,000 RPM or more, depending on the drive type, disc format, and the distance of the read head from the center of the disc (outer tracks ...
The Dell Latitude D-series laptops support swapping out the optical drive with select modules available from Dell. Available were a CD-ROM, DVD-ROM/CD-RW and a DVD±RW optical disk drives, along with a 2nd hard drive, 2nd battery, floppy drive and Iomega Zip 250 drive. An external enclosure branded as the D/Bay was available, allowing users to ...
Dual-layer recording allows DVD-R and DVD+R discs to store significantly more data, up to 8.5 gigabytes per disc, compared with 4.7 gigabytes for single-layer discs. DVD-R DL was developed for the DVD Forum by Pioneer Corporation, while DVD+R DL was developed for the DVD+RW Alliance by Philips and Mitsubishi Kagaku Media (MKM).
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 drive number (for INT 13H) assigned is any of 80 hex (hard disk emulation), 00 hex (floppy disk emulation) or an arbitrary number if the BIOS should not provide emulation. Emulation is useful for booting older operating systems from a CD, by making it appear to them as if they were booted from a hard or floppy disk.
A transparent program disc imprinted with concentric optical sound tracks, used for the Optigan musical organ. Optical sound is a means of storing sound recordings on transparent film. Originally developed for military purposes, the technology first saw widespread use in the 1920s as a sound-on-film format for motion pictures.