s, the first consumer optical discs, used constant linear velocity to double playback time. As the motor's speed decreases from 1,800 to 600 rpm when the read head moves away from the center, the disc constantly moves past the read head at a constant speed. Later optical formats such as the audio CD also employ CLV to maintain both a constant data rate and a constant bit density. Their rotation gradually decreases from 495 to 212 rpm to keep the disc moving past the read laser at . To accommodate the higher data transfer rates and random access requirements of modern CD-ROM drives, CAV systems are used. This is because seek performance would be greatly affected during random access by the requirement to continually modulate the disc's rotation speed to be appropriate for the read head's position.
Dimensions
In case of a 12 cm standard diameter disc, data at the inner edge of the so-called program area, the area containing the data is accessed at 2.4 times the angular speed of the disc compared to at the outer edge. For a miniature disc with a diameter of 8 cm, the angular speed ratio of outer to inner data edge is 1.6 if accessed at a constant linear velocity. This means that, for example, at a constant linar velocity of ×10, the equivalent angular velocity of the disc is ×24 while the being accessed at the inner data area, while being ×10 during access at the outermost edge.
Zoned Constant Linear Velocity is a modification of CLV for high speed CD and DVD recorders where a constant linear velocity is maintained until the next zone, when the speed is stepped up. Early model recorders were CLV drives. The recording speed on such drives was rated in multiples of 150 KiB/s; a 4X drive, for instance, would write steadily at around 600 KiB/s. The transfer rate was kept constant by having the spindle motor in the drive vary in speed and run 2.4 times as fast when recording at the inner rim of the disc as on the outer rim. Some high-speed recorders use the zoned CLV method, which divides the disc into stepped zones, each of which has its own constant linear velocity. When the current zone is finished and the next zone is reached, the disc rotation will speed up, usually to the same angular speed as at the beginning of the previous zone. At higher speeds, ZCLV offers a compromise between CAV, which enables faster seek times, and CLV, which enables greater writing reliability. A ZCLV recorder rated at "52X", for example, would write at a 52X disc rpm on the innermost zone and then progressively step down to 20X disc rpm at the outer rim to keep the rate at which bits are recorded by the laser within a narrow range. This method is used for higher-speed CD-RW variants due to the narrow writing speed range of rewriteable media.
Constant Angular Acceleration is a variant of CLV that is used on the Laserdisc format. The initial specification of CLV results in several playback artifacts to be present in the audio/video portion as well as compatibility problems with Laserdisc players as produced by different manufacturers. In the mid 1980s, Pioneer Electronics introduced the CAA scheme where the speed in rotation of the Laserdisc was lowered in steps and eliminated most playback artifacts and compatibility problems. Since its introduction, most manufacturers of Laserdiscs adopted the CAA format but still referred to their CAA-encoded product as CLV.
