Constant Linear Velocity (CLV) refers to how information is written to or read from a rotating data disk. A typical example can be seen in one of the differences between an LP record and a compact audio disc (CD). With an LP, the disc always spins at a Constant Angular Velocity (CAV) of 33 rpm, so the surface of the record groove passes the needle at slower linear rate as the needle moves toward the center of the disc. This is because when LPs were first developed, motor speed control was not nearly as accurate as it is today; constant linear velocity was harder to control. Thus a record cut and replayed at an ideally constant linear velocity would have suffered severe wow and flutter distortions. DATA (Debt, AIDS, Trade, Africa) was established in 2002 by Bono (Paul Hewson) of the Rock band U2, and Bobby Shriver, along with activists from the Jubilee 2000 Drop the Debt Campaign, as an organisaton focused on Justice, not charity. ... A disc (or disk) is anything that resembles a flattened cylinder in shape. ... A gramophone record, (also phonograph record - often simply record) is an analog sound recording medium: a flat disc rotating at a constant angular velocity, with inscribed spiral grooves in which a stylus or needle rides. ... It has been suggested that CD Rot be merged into this article or section. ... CD may stand for: Compact Disc Canadian Forces Decoration Cash Dispenser (at least used in Japan) CD LPMud Driver Centrum-Demokraterne (Centre Democrats of Denmark) Certificate of Deposit České Dráhy (Czech Railways) Chad (NATO country code) Chalmers Datorförening (computer club of the Chalmers University of Technology) a 1960s... Constant Angular Velocity (CAV) refers to how information is written to or read from a rotating data disk. ... Cav is also a genre of parsnip. ... Revolutions per minute (abbreviated rpm, RPM, r/min, or min-1) is a unit of frequency, commonly used to measure rotational speed, in particular in the case of rotation around a fixed axis. ... Look up Wow in Wiktionary, the free dictionary. ... Flutter: In electronics, rapid variation of signal parameters, such as amplitude, phase, and frequency. ...

With a CD, the motor speed decreases from 495 to 212 rpm as the read head moves away from the center, to keep the disc moving past the read head at a constant linear velocity (CLV) of 1.2 m/s. A DVD has as many as 24 zones of different linear velocity. This zoning has given rise to the notion of zoned constant linear velocity (ZCLV). DVD-R writing/reading side DVD Purple 4. ... Constant Linear Velocity (CLV) refers to how information is written to or read from a rotating data disk. ...