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Discus ruderatus Férussac, 1821 – type species [4] Discus whitneyi (Newcomb, 1864) – Forest disc [5] subgenus Gonyodiscus Fitzinger, 1833 Discus brunsoni Berry, 1955 – Lake disc [5] Discus marmorensis H. B. Baker, 1932 – Marbled disc [5] Discus perspectivus J. C. M. von Mühlfeld, 1816 [4] Discus rotundatus (O. F. Müller, 1774 ...
One of the problems with the earliest computers was how to store data. In the 1950s the International Business Machines (IBM) was trying to solve this problem. [23] The first floppy disk was developed under the supervision of Alan Shugart in the late 1960s. The floppy disk was not introduced to the public until the 1970s by IBM.
The player reads the disc's user-data and processes them according to the DVD-Video format. However, if the drive detects a disc that has been compiled with CSS, it denies access to logical blocks that are marked as copyrighted (§6.15.3 [4]). The player has to execute an authentication handshake first (§4.10.2.2 [4]). The authentication ...
A Maxell-branded 3-inch Compact Floppy Disk. The floppy disk is a data storage and transfer medium that was ubiquitous from the mid-1970s well into the 2000s. [1] Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and ...
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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 ...
8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale) 3½-inch, high-density floppy diskettes with adhesive labels affixed The first commercial floppy disks, developed in the late 1960s, were 8 inches (203.2 mm) in diameter; [4] [5] they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold ...
Colour distribution of a Newton disk. The Newton disk, also known as the disappearing color disk, is a well-known physics experiment with a rotating disk with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet, commonly known by the abbreviation ROYGBIV) appearing as white (or off-white or grey) when it's spun rapidly about its axis.