Abstract: Recording devices and methods are provided for recording marks on an information layer of a record carrier using a 2T write strategy, which enable recordation of marks on the information layer when no write parameter settings specifically tuned for the record carrier are available for use in the 2T write strategy.

Abstract: A method for setting an optimum value of a write power level for use in an optical recording apparatus for writing information on a recording layer (3) of an optical recording medium (1) by means of a radiation beam (5) is described. The recording layer is able to change between an amorphous and a crystalline state. The apparatus comprises a radiation source (4) for emitting the radiation beam (5) having a controllable value of a write power level (Pw) for recording information on the recording medium, a control unit (12) for recording a series of test patterns in a test area on the recording layer, each pattern being recorded with a different value of the write power level, a read unit (90) for reading the patterns and forming corresponding read signal portions, and first means (10, 101, 102) for deriving a value of a read parameter from at least one read signal portion and setting an optimum value (Popt) of the write power level based on the values of this read parameter.

Abstract: The present invention relates to a recording apparatus and a corresponding method for recording information in an information layer of a record carrier (10) by irradiating the information layer (101) by means of a radiation beam (12), said information layer (101) having a phase reversibly changeable between a crystalline phase and an amorphous phase.

Abstract: The present invention relates to a method and a corresponding device for transforming a first set of write parameters (W) of a write strategy, in particular a 2T write strategy, for recording marks in an information layer (301) of a record carrier (30) by irradiating the information layer (301) with a pulsed radiation beam (32) at a first recording speed (R) into a second set of write parameters (W?) of said write strategy for recording marks at a second recording speed (R?), T representing the length of one period of a reference clock. In order to achieve an at least acceptable recording performance at the second recording speed, it is proposed according to the present invention that the duration of the write pulses is kept substantially constant in time, and the duration of a complete sequence of write pulses for recording a mark is kept substantially constant as a fraction of the reference clock T.

Abstract: The invention relates to a method of recording marks in an information layer of a record carrier in which method a 2T write strategy is used. The invention further relates to a recording device capable of carrying out the method. This inventions provides a solution to the problem of how to record marks on then information layer when no write parameter settings specifically tuned for the record carrier to be recorded are available for use in the 2T write strategy.