This divides the disc into several zones, each having its own constant linear velocity.
2.
This led to optical drives until recently operating with a constant linear velocity ( CLV ).
3.
LD-ROMs owe their greater capacity to a design for constant linear velocity ( CLV ) playback.
4.
Although later interfaces were able to stream data at the required speed, many drives now write in a'zoned constant linear velocity '.
5.
But switching to CAV requires considerable changes in hardware design, so instead most drives use the zoned constant linear velocity ( Z-CLV ) scheme.
6.
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 ).
7.
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.
8.
CAV drives give speeds up to 30?at the outer edge of the disc with the same rotational speed as a standard constant linear velocity ( CLV ) 12? or 32?with a slight increase.
9.
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.
10.
Recordings made on a cylinder remain at a constant linear velocity for the entirety of the recording, while those made on a disc have a higher linear velocity at the outer portion of the groove compared to the inner portion.
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