Method and apparatus for recording data onto an optical disc

Abstract

A method of recording information onto an optical disc of the rewritable type, the disc comprising a spiral track, at least part of the track being arranged as a recording area for recording the information, the recording area being further divided into sequential, independently addressable units of pre-determined size, pre-determined numbers of addressable units being grouped in recording unit blocks comprising: deciding for at least an recording unit block that it will be recorded; determining direct overwrite information for said recording unit block, the direct overwrite information comprising information with respect to the number of times the recording unit block was previously recorded; encoding and recording the information into the recording unit block and updating the direct overwrite information for the recording unit block, the direct overwrite information being recorded within the recording unit block. The method also comprise that before recording, reading the said direct overwrite information and adapting Write Strategy and Write Powers accordingly.

Description

technical field [0001] The present invention generally relates to a method of recording information on a writable optical disc. The present application also relates to a recording device and a writable optical disc. Background technique [0002] Rewritable optical media can be rewritten multiple times. Such a reversible recording process is based, for example, on the use of an information layer comprising a phase change material that can change reversibly between an amorphous and a crystalline phase. Amorphous marks are recorded in the crystalline matrix of the information layer by irradiating the information layer with a sequence of short radiation pulses, eg a laser pulse sequence. The radiation pulse melts the phase change material. If the subsequent cooling is rapid after switching off the radiation beam, the amorphous phase is solidified. If the subsequent cooling after switching off the radiation beam is slow, it allows recrystallization and leads to a crystalline ...

AI Technical Summary

Problems solved by technology

It is not attractive to store information about the number of times each recorded area has been recorded in the drive's memory, since such a solution would require a large memory, making it an expensive solution

The disadvantage of storing said information in predetermined areas on the disc is that it has a strong negative impact on the data transfer rate

It is known that optical discs use adjacent spiral tracks to record information and that seeking to a certain position on the disc (seek time) and reading information is time consuming

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