Provided is a technology in which a controller for controlling readwrite performed tofrom an optical disc includes a processor for controlling an interface, a temporary memory unit, a rotation control unit, and an optical control unit. The circuitry is free running, meaning that it is never reset. The system then generates low-resolution data for the telemetry signal from the high-resolution data. Also, when the test is over multiple blocks, sampling of word lines based on similar geometrical locations of the blocks can yield a starting programming voltage optimized for faster programming pages.