Abbreviated CLV, a means of writing data on an optical disc in which the rotational speed of the disc changes depending on where a particular track is written to or read from. Or, in other words, more data is contained on a track near the outside edge of the disc than one near the center. Although CLV allows as much of the total capacity to be utilized as possible, data may not be accessed quickly (although each track is divided into fixed lengths called sectors, each of which starts at a different location); such a disc does not contain tracks that are concentric as with constant angular velocity systems; rather, it contains a single track which is a continuous spiral. As a result, the speed of rotation increases when moving from the outside of the disc toward the center. See also Constant Angular Velocity.