Dawnless Day

This had led to optical drives—until recently—operating with a consistent linear velocity (CLV). The spiral groove of the disc passed under its head at a constant speed. Cassette to CD Recorder Of march the implication of CLV, as opposed to CAV, is that disc angular velocity is no more constant, and spindle motor desideratum to be weighed to vary speed between 200 RPM on the outer rim and 500 RPM on the inner rim.

There are mechanical limits to how quickly a disc can be spun. Beyond a sure degree of rotation, around 10000 RPM, centrifugal stress can cause the disc plastic to creep and possibly shatter. On the outer brink of the CD disc, 10000 RPM limitation roughly equals to 52x speed, but on the inner boundary only to 20x.