But switching to CAV requires considerable changes in hardware design, so instead most drives adoption the zoned monophonic linear velocity (Z-CLV) scheme. This divides the disc into several zones, each having its own contradistinct equable linear velocity. A Z-CLV recorder rated at "52X", for example, would write at 20X on the innermost zone and then progressively escalation the speed in a lot discrete steps up to 52X at the outer rim.
On the other hand, optical drives were developed with an assumption of achieving a constant throughput, in CD drives initially co-ordinate to 150 KiB/s. It was a angle important for streaming audio data, that always tend to desire a regularized fragment rate. But to ensure no disc capacity is wasted, a head had to transfer data at a maximum linear relative at Cassette to CD Recorder all times too, without slowing on the outer rim of disc.