Constant Linear Velocity

This divides the disc into several zones, each having its own constant linear velocity.

First of all, it is used as a synchronization source to achieve constant linear velocity while writing a disc.

Although later interfaces were able to stream data at the required speed, many drives now write in a 'zoned constant linear velocity'.

Constant linear velocity (CLV) keeps the distance covered by the heads per unit time fixed.

This led to optical drives-until recently-operating with a constant linear velocity (CLV).

Constant linear velocity (CLV)

Zoned constant linear velocity (ZCLV)

The concept of constant linear velocity was patented in 1886 by phonograph pioneers Chichester Bell and Charles Tainter.

It travels fastest on the outside edge, unlike audio CDs, which change their speed of rotation to provide constant linear velocity (CLV).

LD-ROMs owe their greater capacity to a design for constant linear velocity (CAV) playback.

Very old CD-ROM drives read with a constant linear velocity (CLV) design, however (usually 12x or slower).

The original CD players designed for the audio playback market, used a technique of reading the disc called Constant Linear Velocity (CLV).

But switching to CAV requires considerable changes in hardware design, so instead most drives use the zoned constant linear velocity (Z-CLV) scheme.

A drive or disc operating in CAV mode maintains a constant angular velocity, contrasted with a constant linear velocity (CLV).

Some high-speed recorders use the zoned CLV method (ZCLV), which divides the disc into stepped zones, each of which has its own constant linear velocity.

This is known as the CLV (constant linear velocity) format, as opposed to the usual CAV (constant angular velocity) format.

(ii) "Long Play" discs (CLV: Constant Linear Velocity) The frames on these discs are assigned differently and they do not play at constant speed.

Laserdiscs, the first consumer optical discs, used constant linear velocity to double playback time (CLV disc can hold 1 hour per side; CAV disc only 30 minutes).

At least one manufacturer in the early 1920s, World Records, produced records that played at a constant linear velocity, controlled by Noel Pemberton Billing's patented add-on governor device.

Furthermore, since constant angular velocity translates into constant linear velocity (the radius of the helical track is constant), cylinders were also free from inner groove problems suffered by disc recordings.

In optical storage, constant linear velocity (CLV) is a qualifier for the rated speed of an optical disc drive, and may also be applied to the writing speed of recordable discs.

Zoned Constant Linear Velocity (ZCLV) is a modification of CLV for high speed CD and DVD recorders.

CAV drives give speeds up to 30x at the outer edge of the disc with the same rotational speed as a standard constant linear velocity (CLV) 12x, or 32x with a slight increase.

This meant that its recording and playback speed decreased toward the edge of the disc (like the Compact Disc and other digital formats), to keep a more constant linear velocity and to improve playing time.

Constant linear velocity or Extended Play discs do not have the "trick play" features of CAV, offering only simple playback on all but the high-end LaserDisc players incorporating a digital frame store.