JP4462650B2 - Optical recording medium, recording method and recording apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a phase change optical recording medium.,How to recordAnd recording deviceIn particular, the present invention relates to an apparatus for improving recording characteristics and reducing a redundant portion of a sector.
[0002]
[Prior art]
One type of rewritable optical recording medium in which a user can directly rewrite data is a phase change optical recording medium. As is well known, a phase-change optical recording medium uses a material that performs a reversible phase change between a crystalline state and an amorphous state as a recording material. For example, data recording is in a crystalline state. The recording material is abruptly melted and rapidly cooled with a high-power laser to become non-crystallized, and the recorded data is erased by slowly heating and cooling the recording material with a weaker-power laser than when recording. The recorded data is reproduced by utilizing the difference in reflectance between the crystalline state and the amorphous state. Then, by modulating the laser power between the power at the time of erasing and the power at the time of recording, new data can be recorded while erasing existing recording data, that is, rewriting (overwriting) can be performed. it can.
[0003]
Incidentally, it is known that the phase change optical recording medium has the following drawbacks.
(A) When the number of overwrites increases, the recording start position and the recording end in the data area that is the area where user data (and the error correction code added thereto) is actually recorded in the data recording area in the sector Since the film thickness of the recording material at the position becomes non-uniform, data cannot be recorded at these positions due to changes in the thermal characteristics of the recording material, or the recorded data cannot be accurately reproduced due to fluctuations in reflectance. Deterioration of recording characteristics occurs.
[0004]
(B) When overwriting to record data of the same pattern repeatedly (hereinafter referred to as repetitive overwriting) is performed, the same data is repeatedly recorded at the same position in the data area. Arise. As a result, repeated overwriting cannot be performed many times.
[0005]
Conventionally, in order to eliminate the disadvantage (a), for example, the area near the front end of the data area that is the recording start position and the vicinity of the rear end of the data area that is the recording end position are used as areas for recording the true user data. Without use, user data is reproduced from a portion other than the vicinity of the front end and the vicinity of the rear end of the data area at the time of reproduction.
[0006]
In order to eliminate the drawback (b), for example, the same data is recorded in the data area by changing the recording start position (and hence the recording end position) in the data area for each recording. The position to be changed is changed every time recording is performed.
[0007]
[Problems to be solved by the invention]
However, when the recording start position and the recording end position are not used as the area for recording the true user data in the data area and the recording start position and the recording end position are changed at every recording time, The data area must be set to be considerably larger than the size originally necessary for recording a certain number of bytes of user data. As a result, there is a problem that the data area becomes redundant (therefore, the entire sector becomes redundant).
[0008]
In addition, in the conventional phase change type optical recording medium, similarly to other optical recording media, a recording laser is placed in a preformat area in a sector (an area in which a sector address is recorded in advance). An ALPC (Auto Laser Power Control) area for adjusting power is provided. For example, when recording is performed at a high transfer rate, the ALPC area must be set considerably large in order to sufficiently increase the power of the recording laser (otherwise, the phase change type optical recording medium). There must be special hardware in the recording device to increase the power of the recording laser). As a result, there is a problem that the preformat area becomes redundant (and therefore the entire sector becomes redundant also from this point), or the circuit configuration of the recording apparatus becomes complicated and large.
[0009]
  The present invention has been made in view of the above points, and is a phase change optical recording medium that avoids deterioration of recording characteristics and reduces the redundant portion of the entire sector.,How to recordAnd recording deviceIs to provide.
[0010]
[Means for Solving the Problems]
  The optical recording medium according to the present invention includes dataareaIn each rewritable optical recording medium having a sector configuration that is a recording / reproducing unit havingPre-pitted header, gap area provided after the pre-pitted header, and provided after the gap areaThis is an area for adjusting the power of the recording laser.The lengthA variable first area;VFO area provided after this first area and provided after this VFO areaData area and dataareaAfterProvided in, The front end position of this first areaHas a variable length that changes in response to a change in lengthA second area, and by moving the rear end position of the first area and the front end position of the second area by the same distance,Within a sectorThis data area is moved as a whole.
[0011]
  This optical recording medium isareaFor each sector that is a recording / playback unit havingPre-pitted header, gap area provided after the pre-pitted header, and provided after the gap areaThis is an area for adjusting the power of the recording laser.The lengthA variable first area;VFO area provided after this first area and provided after this VFO areaData area and dataareaAfterProvided in, The front end position of the first areaHas a variable length that changes in response to a change in lengthThe structure includes the second area.
[0012]
  When repeatedly overwriting an optical recording medium having such a sector structure, the rear end of the first area at different recording times (for example, every recording time or every appropriate number of times recording) If the position and the front end position of the second area are moved in the same direction and the same distance,Within a sectorThe data area moves as a whole. Accordingly, since the position where the same data is recorded in the data area changes at the time of these different recordings, the deterioration of the recording characteristics due to repeated overwriting is avoided.
[0013]
In addition, when the entire data area is moved in this way to avoid deterioration of recording characteristics due to repeated overwriting, the recording start position and the recording end position are changed in the data area as in the past. Therefore, it is not necessary to set a large data area as compared with the case where deterioration of recording characteristics due to repeated overwriting is avoided. Therefore, the redundant part of the data area is reduced.
[0014]
  In this optical recording medium, the first area is used for adjusting the power of the recording laser. Therefore, the preformat area as beforeIs a headerSince it is possible to adjust the power of the recording laser without providing an ALPC area, it is possible to omit the ALPC area.headerThe redundant part is reduced.
[0015]
  Also,Area after the header across the gap areaIt is necessary to provide an area (guard area) for improving the overwrite characteristics from the beginning, but the first and second areas can be used as the guard area. By the presence of two areasArea after the headerIs no longer redundant.
[0016]
  Thus, the data area,headerRedundant parts are reduced, and the presence of the first and second areasArea after the headerTherefore, the redundant portion of the entire sector can be reduced.
[0017]
  And preformat areaIs a headerNot in the areaArea after the header across the gap areaBy using the first area in front of the data area for adjusting the power of the recording laser, the same conditions as when recording in the data area (for example, in the area consisting of lands and grooves as in the data area) ) The power of the recording laser is adjusted, and the data area is immediately recorded with the adjusted power. As a result, data can be recorded and rewritten with more appropriate power than before.
[0019]
  Next, the recording method of the optical recording medium according to the present invention includes dataareaIn a recording method of a rewritable optical recording medium having a sector configuration that is a recording / reproducing unit having, for each sector,Pre-pitted header, gap area provided after the pre-pitted header, and provided after the gap areaThis is an area for adjusting the power of the recording laser.The lengthA variable first area;VFO area provided after this first area and provided after this VFO areaData area and dataareaAfterProvided in, The front end position of this first areaHas a variable length that changes in response to a change in lengthThe power of the recording laser is adjusted in the first area including the second area, and at the time of different recording, the rear end position of the first area and the front end position of the second area are the same distance in the same direction. By movingWithin a sectorThe feature is that the data area is moved as a whole.
  Further, an optical recording medium recording apparatus according to the present invention is a recording apparatus for recording on a rewritable optical recording medium having a sector configuration which is a recording / reproducing unit having user data in a data area. In a typical recording medium, a pre-pitted header is provided for each sector, and is an area used for adjusting the power of a recording laser provided after the pre-pitted header. Recording means for changing the length of the first area after the recording, recording the data in the VFO area after the first area, and recording the user data in the data area after the VFO area. The recording means changes the length of the second area after the data area in correspondence with the variable length of the first area, and the first recording area is different in the first recording time. By the same distance moved and the rear end position and the front end position of the second area of the area in the same direction, characterized in that it is recorded so as to move as a whole data area within a sector.
[0020]
  Recording method of this optical recording mediumAnd recording deviceOK, the dataareaFor each sector that is a recording / playback unit havingPre-pitted header, gap area provided after the pre-pitted header, and provided after the gap areaThis is an area for adjusting the power of the recording laser.The lengthA variable first area;VFO area provided after this first area and provided after this VFO areaData area and dataareaAfterProvided in, The front end position of the first areaHas a variable length that changes in response to a change in lengthAt the time of different recording including the second area (for example, at every recording time or every time recording is performed an appropriate number of times), the rear end position of the first area and the front end position of the second area By moving the same distance in the same direction,Within a sectorThe data area is moved as a whole. Accordingly, since the position where the same data is recorded in the data area changes at the time of these different recordings, the deterioration of the recording characteristics due to repeated overwriting is avoided.
[0021]
In addition, since the entire data area is moved in this way to avoid deterioration of the recording characteristics due to repeated overwriting, the recording start position and the recording end position are changed in the data area as in the prior art. It is not necessary to set a large data area as compared with a case where deterioration of recording characteristics due to repeated overwriting is avoided. Therefore, the redundant part of the data area is reduced.
[0022]
  This recording methodAnd recording deviceThen, this first area is used for adjusting the power of the recording laser. Therefore, the preformat area as beforeIs a headerSince it is possible to adjust the power of the recording laser without providing an ALPC area, it is possible to omit the ALPC area.headerThe redundant part is reduced.
[0023]
  Also,Area after the header across the gap areaHowever, since it is necessary to provide a guard area for improving the overwriting characteristics, the first and second areas can be used as the first and second areas. By the presence ofArea after the headerIs no longer redundant.
[0024]
  Thus, the data area,headerRedundant parts are reduced, and the presence of the first and second areasArea after the headerTherefore, the redundant portion of the entire sector can be reduced.
[0025]
  And preformat areaIs a headerNot in the areaArea after the header across the gap areaSince the first area existing in front of the data area is used for adjusting the power of the recording laser, under the same conditions as when recording in the data area (for example, from the land and groove as in the data area) The recording laser power is adjusted and the data area is immediately recorded with the adjusted power. As a result, data can be recorded and rewritten with more appropriate power than before.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of sector arrangement in a disk-shaped phase change optical recording medium (phase change optical disk) to which the present invention is applied. The recording surface of the optical disc 1 is divided into n zones (n is a natural number) Z1 to Zn along the radial direction of the disc. Within the same zone, the number of sectors per track is constant, the number of sectors in the innermost zone Z1 is the smallest, the number of sectors increases by one as it goes to the outermost zone, and the number of sectors in the outermost zone Zn The number of sectors is the largest. Data recording / reproduction in each zone is performed based on a clock signal having a frequency corresponding to the number of sectors in the zone while the optical disc 1 is rotated at a constant linear velocity.
[0028]
Each sector of the optical disc 1 is provided with a preformat area (also referred to as a header) in which addresses of the sectors are recorded in advance and a data recording area.
[0029]
FIG. 2 schematically shows an example of the appearance of the header and the data recording area on the recording surface of the optical disc 1. The data recording area DE is composed of lands and grooves. On the other hand, the header includes a header Header 1 indicating the address of the groove and a header Header 2 indicating the address of the land, and these are formed of a series of embossed pits (pits protruding from the recording surface). Note that wobbling is performed at a groove single frequency (for example, 408 periods per sector (4 periods per frame)), and this wobbling is used for clock signal generation and address synchronization.
[0030]
FIG. 3 shows an example of the sector structure (sector format) of the optical disc 1. The sector length is 124032ch (channel bits). (1 byte = represented by 12 channel bits) A header Header 1 is provided at the head of the sector, and a header Header 2 is provided behind the header with a 6-channel gap GaP1 used in timing signal switching time, etc. Yes.
[0031]
Headers Header I and Header 2 each occupy 1120 ch. Each header Header I, Header 2 is a 72-channel 2-sector mark SM indicating the beginning of the format, a 468-channel VFO which is a continuous data pattern for PLL lock, and a 28-channel address indicating the read start position of data in the header. A mark AM, a 102ch ID representing a track number and a sector number, and a 16ch postamble PA used when the error correction code of the ID does not fit in 2 bytes, VFO to PA are VFO1, AM1, ID1, PA1, VFO2, AM2, ID2, and PA2 are formed in a double manner. The headers Header 1 and Header 2 are not provided with an ALPC area for adjusting the power of the recording laser.
[0032]
A data recording area DE is provided behind the header Header 2 with a 6-channel gap GaP2 and a 96-channel GaP3 interposed therebetween. In the data recording area DE, a guard area Guard1 of (320 + j) ch (j is an integer that is variably set within the range of 0 to 127) is provided at the front thereof.
[0033]
In the data recording area DE, following the guard area Guard1, 468ch VFO3, 42ch SYNC indicating the start position of user data in the data part, and user data (and an error correction code added thereto) are recorded. A data area DATA of 119168ch, a postamble PA3 of 12ch, and a guard area Guard2 of (880-j) ch are provided.
[0034]
The guard areas Guard1 and Guard2 are areas for improving the characteristics of repetitive overwriting. As will be described later, the guard area Guard1 is also used as an area for adjusting the power of the recording laser. It has become. The meaning of j in the number of channels in the guard areas Guard1 and Guard2 will be described later.
[0035]
A 794 ch buffer BF is provided behind the data recording area DE (at the end of the sector) to absorb jitter due to disk eccentricity or the like.
[0036]
FIG. 4 shows a configuration example of an error correction block (ECC block) in the data area DATA. A correction code in which a parity of 24 bytes is added to 172 bytes of user data is used. The recording / reproducing direction is the horizontal direction in the figure. One interleave length is 384 bytes.
[0037]
One error correction block is composed of 64 kbytes of data. Accordingly, 64 kbytes is the minimum unit for recording / reproducing data in the data area DATA. However, after data is recorded / reproduced in units of 64 kbytes by this error correction block, desired 2 kbytes of data is recorded / reproduced, thereby recording / reproducing 2 kbytes of data per sector ( It can also be used as a 2k data sector for data storage).
[0038]
FIG. 5 shows a frame configuration example of the data area DATA of FIG. The 96-byte data obtained by dividing one interleave length data of the error correction block of FIG. Then, one dcc block is composed of 6 bytes = 72 ch data blocks (one of data blocks 0 to 15 in FIG. 5) and 2 ch dcc bits obtained by dividing the one frame data into 16 equal parts. One frame is composed of dcc blocks. Therefore, the size of one frame is 1184ch. In front of each frame, there are 32 channel frame synchronization signals frmsync and dcc (dc control) bits, respectively.
[0039]
Next, an example of a recording method when repeatedly overwriting the optical disc 1 will be described.
At the time of the first recording in the repetitive overwriting operation, for example, as shown in FIG. 6A, the sizes of the guard areas Guard1 and Guard2 are set to 320 ch and 880 ch, respectively (that is, j = 0 is set). Then, the power of the recording laser is adjusted in the guard area Guard1, and true user data is recorded in portions other than the vicinity of the front end and the vicinity of the rear end of the data area DATA (for example, dummy data is included at the beginning and the end, respectively) User data is recorded from the front end to the rear end of the data area DATA).
[0040]
Next, at the time of the second recording in the repetitive overwriting operation, as shown in FIG. 6B, for example, the sizes of the guard areas Guard1 and Guard2 are set to 328 ch and 872 ch, respectively (that is, j = 8 is set). (Even if the value of j is increased in this way, the total number of channel bits of the guard areas Guard1 and Guard2 remains constant.) Thus, the rear end position of the guard area Guard1 and the front end of the guard area Guard2 Since the position changes backward by 8 channels, the entire VFO3, SYNC, data area DATA, and postamble PA3 between the guard areas Guard1 and Guard2 move 8 channels backward from the time of the first recording.
[0041]
In this state, the power of the recording laser is adjusted in the guard area Guard1, and true user data is recorded in portions other than the vicinity of the front end and the vicinity of the rear end of the data area DATA. As a result, the position where the same data is recorded in the data area DATA changes by 8ch between the first recording and the second recording.
[0042]
In the subsequent third recording, for example, as shown in FIG. 6C, the sizes of the guard areas Guard1 and Guard2 are set to 336ch and 864ch, respectively (that is, j = 16 is set). As a result, VFO3, SYNC, data area DATA, and postamble PA3 as a whole move backward by 8ch from the time of the second recording (thus, backward by 16ch from the time of the first recording).
[0043]
In this state, the power of the recording laser is adjusted in the guard area Guard1, and true user data is recorded in portions other than the vicinity of the front end and the vicinity of the rear end of the data area DATA. As a result, the position where the same data is recorded in the data area DATA changes by 8ch at the time of the first to third recording.
[0044]
Hereinafter, at the time of each recording after the fourth time, the front end of the data area DATA is obtained by incrementing the value of j by 8 to move the VFO3, the SYNC, the data area DATA, and the postamble PA3 backward by 8ch. Record true user data in parts other than the vicinity and the vicinity of the rear end. As a result, the position where the same data is recorded in the data area DATA changes by 8ch at each recording time of the repeated overwriting operation.
[0045]
Thus, since the position where the same data is recorded in the data area DATA changes at each recording time of the repetitive overwriting operation, deterioration of recording characteristics due to repetitive overwriting is avoided.
[0046]
In addition, since the entire data area DATA is moved in this way to avoid deterioration of recording characteristics due to repeated overwriting, the recording start position and recording end position can be changed in the data area as in the past. Thus, the data area DATA itself is set smaller than in the case where deterioration of the recording characteristics due to repeated overwriting is avoided. Therefore, redundant portions are reduced in the data area DATA as compared with the prior art.
[0047]
In addition, the guard area Guard1 is used for adjusting the power of the recording laser, and the installation of the ALPC area in the headers Header1 and Header2 is omitted, so that the headers Header1 and Header2 (preformat area) are conventionally used. Even the redundant part has been reduced.
[0048]
Further, since the guard areas Guard1 and Guard2 are originally areas that need to be provided in the data recording area DE in order to improve the overwrite characteristics repeatedly, the presence of these areas makes the data recording area DE more redundant than before. Never
[0049]
In this way, the redundant portions of the data area DATA and headers Header1 and Header2 are reduced, and the data recording area DE is not redundant due to the presence of the guard areas Guard1 and Guard2, so that the redundant portion of the entire sector can be reduced. It has been realized.
[0050]
Since the guard area Guard1 existing in front of the data area DATA in the same data recording area DE as the data area DATA is used for adjusting the power of the recording laser, not the areas in the headers Header1 and Header2. The power of the recording laser is adjusted under the same conditions as when recording in the data area DATA (in the area composed of lands and grooves as in the data area DATA as shown in FIG. 2), and the adjusted power is used as it is. Recording is immediately performed in the data area DATA. As a result, data can be recorded and rewritten with more appropriate power than before.
[0051]
Note that in the above example, the rear end position of the guard area Guard1 and the front end position of the guard area Guard2 are changed by 8ch at each repetitive overwrite recording time, but at each recording time, these positions are set to other than 8ch. May be changed by an appropriate number of bit channels (for example, changed by the number of bit channels of a value generated from an M sequence (maximum long period sequence) generator).
[0052]
In the above example, the rear end position of the guard area Guard1 and the front end position of the guard area Guard2 are changed backward for each repeated overwrite recording, but these positions are changed forward for each recording. You may let them.
[0053]
Further, in the above example, the rear end position of the guard area Guard1 and the front end position of the guard area Guard2 are changed for each repeated overwrite recording time (every time recording is performed). These positions may be changed each time recording is performed.
[0054]
In the above example, the installation of the ALPC area in the headers Header 1 and Header 2 is omitted, but the ALPC area may be provided in the headers Header 1 and Header 2 as usual. In such a case, the power of the recording laser can be adjusted in both the ALPC area and the guard area Guard1 (an area longer than the conventional area is secured as an area for adjusting the power of the recording laser). Therefore, it is possible to sufficiently increase the power of the recording laser without providing special hardware for increasing the power of the recording laser in the recording apparatus of the phase change optical recording medium. Become. Therefore, in this case, the circuit configuration of the recording apparatus can be simplified and downsized.
[0055]
In addition, the number of channel bits in each area in the sector is not limited to that shown in FIG. 3, and the error correction block configuration and data area frame configuration are shown in FIGS. Of course, it may be appropriate as well.
[0056]
In the above example, the present invention is applied to a disk-like phase change optical recording medium. However, the present invention is applied to other phase change optical recording media (for example, a card-like phase change optical recording medium). The invention may be applied.
[0057]
Further, the present invention is not limited to the above examples, and it is needless to say that various other configurations can be taken without departing from the gist of the present invention.
[0058]
【The invention's effect】
  As described above, the optical recording medium according to the present invention includes dataareaFor each sector that is a recording / playback unit havingPre-pitted header, gap area provided after the pre-pitted header, and provided after the gap areaThis is an area for adjusting the power of the recording laser.The lengthA variable first area;VFO area provided after this first area and provided after this VFO areaData area and dataareaAfterProvided in, The front end position of this first areaHas a variable length that changes in response to a change in lengthSince it has a structure including the second area, by moving the rear end position of the first area and the front end position of the second area in the same direction by the same distance,Within a sectorThe data area can be moved as a whole. Therefore, the movement of the entire data area can avoid the deterioration of recording characteristics due to repeated overwriting.
[0059]
In addition, when the entire data area is moved in this way to avoid deterioration of recording characteristics due to repeated overwriting, the recording start position and the recording end position are changed in the data area as in the past. Therefore, it is not necessary to set a large data area as compared with the case where deterioration of recording characteristics due to repeated overwriting is avoided. Therefore, the redundant part of the data area can be reduced.
[0060]
  Since the first area is used for adjusting the power of the recording laser, the preformat areaIs a headerBy omitting the installation of the ALPC area inheaderThe redundant part can be reduced.
[0061]
  Also,Area after the header across the gap areaHowever, since it is necessary to provide a guard area for improving the overwriting characteristics, the first and second areas can be used as the first and second areas. By the presence ofArea after the headerIs no longer redundant.
[0062]
  Thus, the data area,headerRedundant parts are reduced, and the presence of the first and second areasArea after the headerTherefore, the redundant portion of the entire sector can be reduced.
[0063]
  And preformat areaIs a headerNot in the areaArea after the header across the gap areaBy using the first area in front of the data area for adjusting the power of the recording laser, the same conditions as when recording in the data area (for example, in the area consisting of lands and grooves as in the data area) ) The power of the recording laser is adjusted, and the data area is immediately recorded with the adjusted power. As a result, data can be recorded and rewritten with more appropriate power than in the past.
[0065]
  Next, an optical recording medium recording method according to the present inventionAnd recording deviceAccording to the dataareaFor each sector that is a recording / playback unit havingPre-pitted header, gap area provided after the pre-pitted header, and provided after the gap areaThis is an area for adjusting the power of the recording laser.The lengthA variable first area;VFO area provided after this first area and provided after this VFO areaData area and dataareaAfterProvided in, The front end position of the first areaHas a variable length that changes in response to a change in lengthBy moving the rear end position of the first area and the front end position of the second area by the same distance in the same direction at the time of different recording including the second area.Within a sectorThe data area is moved as a whole. Therefore, since the position where the same data is recorded in the data area changes during these different recordings, it is possible to avoid the deterioration of the recording characteristics due to repeated overwriting.
[0066]
In addition, since the entire data area is moved in this way to avoid deterioration of the recording characteristics due to repeated overwriting, the recording start position and the recording end position are changed in the data area as in the prior art. It is not necessary to set a large data area as compared with a case where deterioration of recording characteristics due to repeated overwriting is avoided. Therefore, the redundant part of the data area can be reduced.
[0067]
  Since the first area is used for adjusting the power of the recording laser, the preformat areaIs a headerBy omitting the installation of the ALPC area inheaderThe redundant part can be reduced.
[0068]
  Also,Area after the header across the gap areaHowever, since it is necessary to provide a guard area for improving the overwriting characteristics, the first and second areas can be used as the first and second areas. By the presence ofArea after the headerIs no longer redundant.
[0069]
  Thus, the data area,headerRedundant parts are reduced, and the presence of the first and second areasArea after the headerTherefore, the redundant portion of the entire sector can be reduced.
[0070]
  And preformat areaIs a headerNot in the areaArea after the header across the gap areaSince the first area existing in front of the data area is used for adjusting the power of the recording laser, under the same conditions as when recording in the data area (for example, from the land and groove as in the data area) The recording laser power is adjusted and the data area is immediately recorded with the adjusted power. As a result, data can be recorded and rewritten with more appropriate power than in the past.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of sector arrangement on an optical disc.
FIG. 2 is a diagram illustrating an example of an appearance of a header and a data recording area on a recording surface of an optical disc.
FIG. 3 is a diagram showing an example of a sector structure of an optical disc to which the present invention is applied.
4 is a diagram illustrating a configuration example of an error correction block in the data area of FIG. 3;
5 is a diagram illustrating a frame configuration example of a data area in FIG. 3;
6 is a diagram illustrating a state in which the data area in FIG. 3 moves.
[Explanation of symbols]
1 Optical disk, Header 1 and Header 2 header, DE data recording area, Guard 1 and Guard 2 guard area, DATA data area

Claims (4)

In a rewritable optical recording medium having a sector configuration that is a recording / reproducing unit having a data area ,
For each said sector,
A pre-pitched header,
A gap area provided after the pre-pitted header;
An area for adjusting the power of the recording laser provided after the gap area, the first area having a variable length ;
A VFO area provided after the first area;
A data area provided after the VFO area ;
A second area having a variable length provided after the data area , the front end position being changed corresponding to the change in the length of the first area,
An optical recording medium in which the data area in the sector is moved as a whole by moving the rear end position of the first area and the front end position of the second area by the same distance. In a recording method of a rewritable optical recording medium having a sector configuration which is a recording / reproducing unit having a data area ,
For each said sector,
A pre-pitched header,
A gap area provided after the pre-pitted header;
An area for adjusting the power of the recording laser provided after the gap area, the first area having a variable length ;
A VFO area provided after the first area;
A data area provided after the VFO area ;
Including a second area provided after the data area and having a variable length in which a front end position is changed corresponding to a change in the length of the first area;
Adjusting the power of the recording laser in the first area;
During the different recording, the data area in the sector is moved as a whole by moving the rear end position of the first area and the front end position of the second area in the same direction by the same distance . Recording method of optical recording medium. In the recording method of the optical recording medium according to claim 2,
A recording method for an optical recording medium, wherein the rear end position of the first area and the front end position of the second area are moved by a predetermined distance each time recording is performed a predetermined number of times. In a recording apparatus for recording on a rewritable optical recording medium having a sector configuration which is a recording / reproducing unit having user data in a data area,
The optical recording medium is provided with a pre-pitted header for each of the sectors,
For the first area after the gap area provided after the pre-pitted header, adjusting the recording laser power while making the length of the first area variable,
Record against the VFO area after the first area,
Recording means for recording the user data in a data area after the VFO area;
The recording means varies the length of the second area after the data area in correspondence with the variable length of the first area, and the rear end position of the first area at the time of different recording And the front end position of the second area are moved in the same direction by the same distance, and the data area in the sector is moved and recorded as a whole.
Recording device.

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