Optical recording medium and recording/reproduction method and apparatus thereof
An optical recording medium and a technology for optical recording media, applied in optical recording/reproducing/erasing methods, digital recording/reproducing, recording/reproducing by optical methods, etc., can solve the problems of long waiting time and achieve short start-up time, shortening time, improving reliability
Inactive Publication Date: 2004-04-21
PANASONIC CORP
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Problems solved by technology
However, there is always a problem in determining the optimum recording / reproducing conditions, that is, an action called verification is required at the time of starting, so that the waiting time is longer
Method used
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[0035] Referring now to the drawings, in which like numerals denote like elements, an optical recording medium, and a recording / reproducing method and a recording / reproducing apparatus according to the present invention will be described below.
[0036] figure 2 shows an optical recording medium according to an embodiment of the present invention, which is compatible with figure 1 The optical recording medium in the prior art shown in is similar, and the difference between the two lies in the recording area 4 . The recording area 4 is composed of two sub-areas including a first recording sub-area 4a and a second recording sub-area 4b. The first and second recording sub-areas 4a and 4b are used to record the same recording / reproducing conditions. In the example, when the recording / reproducing conditions are read out, the sub-area 4a is accessed first, and if the recording / reproducing conditions cannot be read out, the second sub-area 4b is accessed. As a result, even when t...
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An optical recording medium has a recording / reproduction conditions recording area for recording recording / reproduction conditions and recording / reproduction apparatus information identifying the recording / reproduction apparatus using the recording / reproduction conditions. When the optical recording medium is accessed in a recording / reproduction apparatus, the recording / reproduction conditions for the recording / reproduction apparatus are used. Therefore, recording or reproduction can be performed with use of optimum recording / reproduction apparatus appropriate for the optical recording medium and for the recording / reproduction apparatus. When the optical recording medium is used for the first time, test recording is performed by using a test recording region provided in the optical recording medium, and the obtained recording / reproduction conditions are recorded.
Description
technical field [0001] The present invention relates to an optical recording medium, a recording / reproducing method, and a recording / reproducing apparatus for recording and reproducing information by using radiation of a laser beam or the like. Background technique [0002] Optical recording media have attracted much attention as a memory with large capacity and high density. A writable optical recording medium called an erasable type has been developed. An erasable optical recording medium has a recording layer composed of a thin film that undergoes phase transition between amorphous and crystalline states, and records and erases information by thermal energy due to laser beams. Alloy films composed mainly of Ge, Sb, Te, In, etc., such as GeSbTe films, are known as phase change materials for recording layers. In many cases, when information is erased by crystallization of amorphous marks, information is recorded by forming marks by partially changing the recording layer t...
Claims
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IPC IPC(8): G11B20/12G11B7/0037G11B7/004G11B7/0045G11B7/005G11B7/006G11B7/007G11B7/09G11B7/125G11B19/04G11B19/12G11B20/10G11B27/00G11B27/36
CPCG11B7/0945G11B7/1267G11B7/0062G11B7/007G11B7/00736G11B7/126G11B20/10G11B7/006G11B20/10046G11B7/005G11B7/00745G11B20/10009G11B19/04G11B7/0045G11B19/12G11B20/10481G11B7/0037G11B27/36
Inventor 秋山哲也西内健一古川惠昭鸣海健治山口博之
Owner PANASONIC CORP