METHOD AND DEVICE FOR RECORDING MARKS IN RECORDING LAYER OF AN OPTICAL STORAGE MEDIUM

摘要

The invention relates to a method and to a recording device for recording marks (1) in a phase-change type storage medium. Generally, an nT mark (1) is recorded by a sequence of n-1 or less write pulses. In slow cooling stacks, this results in low quality marks. The invention proposes to increase the cooling period in between the multi-pulses (3) in a sequence of write pulses by applying multi-pulses (3) with a pulse duration of Tmp<4 ns and duty cycle of Tmp/Tw where Tw is the reference clock period time and Tw<40 ns. In this way very good quality marks (1) are obtained even after a large number of direct overwrite (DOW) cycles and at a wide recording power and recording velocity window.