JP2005100657A - Multi-layered information recording medium, recording device, and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rewritable multi-layered information recording medium with which the effective utilization of spare areas and the improvement in access performance are realized. <P>SOLUTION: The multi-layered information recording medium having a plurality of recording layers includes a user data area for recording user data; and a plurality of the spare areas including at least one replacement region, wherein when the user data area includes at least one defect region, the at least one replacement region may be used in place of the at least one defect region, wherein the first spare area of the plurality of spare areas is positioned so as to be contiguous to the first user data area and the second spare area of the plurality of the spare areas is positioned so as to be contiguous to the second user data area, and the first spare area and the second spare area are positioned approximately at the same radial position on the multi-layered information recording medium. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multilayer information recording medium having at least two recording layers, a recording apparatus, and a recording method.

  There is an optical disc as an information recording medium having a sector structure. In recent years, AV data such as audio data and video data has been digitized, and an optical disk with higher density and larger capacity has been demanded. In order to increase the capacity, it is useful to use a plurality of recording layers. For example, in a DVD read-only disc, the capacity can be doubled by forming two recording layers on one optical disc.

  FIG. 1 is a configuration diagram of a track 2 and a sector 3 of a general optical disk medium 1. A disk-shaped disk medium 1 has a large number of tracks 2 formed in a spiral shape, and each track 2 has a large number of finely divided sectors 3. The area formed on the disk medium 1 is roughly divided into a lead-in area 4, a user data area 8, and a lead-out area 6. User data recording / reproduction is performed on the user data area 8. The lead-in area 4 and the lead-out area 6 serve as margins so that the optical head (not shown) can follow the track even if the optical head overruns when accessing the end of the user data area 8. Fulfill. The lead-in area 4 includes a disk information area in which parameters necessary for accessing the disk medium 1 are stored. Sector 3 is assigned a physical sector number (hereinafter abbreviated as PSN) to identify each sector. Further, the sector 3 included in the user data area 8 also includes consecutive logical sector numbers (hereinafter abbreviated as LSN) starting from 0 so that a host device (not shown) such as a host computer recognizes the sector. Assigned.

  FIG. 2 shows the principle of reproducing data from a read-only optical disc 30 having two recording layers, which will be described below. Grooves are formed in the transparent substrates 31 and 32 to form spiral tracks, and the recording layers 33 and 34 are deposited thereon, whereby the recording layers 33 and 34 are formed, respectively. A transparent photo-curing resin 35 is filled between the two recording layers 33 and 34, and the two substrates 31 and 32 are bonded together to form one read-only optical disc 30. Here, for convenience of explanation, in FIG. 2, the recording layer 34 closer to the incident laser beam 38 is called the first recording layer, and the recording layer 33 farther away is called the second recording layer. The thickness and composition of the first recording layer 34 are adjusted so that the incident laser beam 38 is half reflected and half transmitted. The thickness and composition of the second recording layer 33 are adjusted so as to reflect all incident laser light 38. The focal point (beam spot) 36 of the laser beam 38 is moved to the first recording layer 34 or the second recording layer 33 by moving the objective lens 37 that converges the laser beam 38 closer to or away from the read-only optical disc 30. Can be converged to.

  FIGS. 3A, 3B, 3C, and 3D respectively show tracks, playback directions, and sector numbers of two recording layers 41 and 42 called a parallel path of a read-only DVD disc. 3A shows a spiral groove pattern of the second recording layer 42, FIG. 3B shows a spiral groove pattern of the first recording layer 41, and FIG. 3C is arranged in the recording layers 41 and 42. The reproduction direction of the user data area 8 is shown, and FIG. 3D shows the sector numbers assigned to the recording layers 41 and 42.

When the read-only DVD disc is rotated clockwise as viewed from the bottom of FIGS. 3A and 3B, the laser beam is transmitted along the track 2 from the inner peripheral side of the first and second recording layers 41 and 42 to the outer periphery. Go to the side. When reproducing user data in order along the reproduction direction shown in FIG. 3C, reproduction is performed from the innermost position to the outermost position of the user data area 8 of the first recording layer 41, and then the second layer recording is performed. Data is reproduced from the innermost position to the outermost position in the user data area 8 of the layer 42. The user data area 8 of the first and second recording layers 41 and 42 is sandwiched between the lead-in area 4 and the lead-out area 6 so that it can follow the track 2 even if the optical head overruns. Yes. As shown in FIG. 3D, the PSN and LSN of each recording layer 41 and 42 are assigned so as to increase in the order of the reproduction direction. The PSN does not have to start from 0 so that disc molding is easy, and may not be continuous between the first and second recording layers 41 and 42 (the layer number is the sector number). PSN may be the value located in the upper digit of As the LSN, consecutive numbers starting from 0 are assigned to all user data areas 8 included in the DVD disc. In the user data area 8 of the first recording layer 41, the LSN becomes 0 at the innermost peripheral position, and increases by 1 as it goes to the outer peripheral side. The LSN at the innermost peripheral position of the user data area 8 of the second recording layer 42 is a number obtained by adding 1 to the maximum LSN of the recording layer 41 of the first user data area 8, and as it goes to the outer peripheral side. Increase by one.

  FIGS. 4A, 4B, 4C, and 4D show the tracks, playback directions, and sector numbers of the two recording layers 43 and 44, which are called opposite paths of a read-only DVD disc, respectively. 4A shows a spiral groove pattern of the second recording layer 44, FIG. 4B shows a spiral groove pattern of the first recording layer 43, and FIG. 4C is arranged in the recording layers 43 and 44. The reproduction direction of the user data area 8 is shown, and FIG. 4D shows the sector numbers assigned to the recording layers 43 and 44.

  When the read-only DVD disc is rotated clockwise as viewed from the bottom of FIGS. 4A and 4B, the laser beam travels from the inner circumference side to the outer circumference side in the first recording layer 43 along the track 2. In the recording layer 44 of the eye, it proceeds from the outer peripheral side to the inner peripheral side. When reproducing user data sequentially along the reproduction direction shown in FIG. 4C, reproduction is performed from the innermost position to the outermost position of the user data area 8 of the first recording layer 43, and then the second layer recording is performed. Data is reproduced from the outermost peripheral position of the user data area 8 of the layer 44 to the innermost peripheral position. The user data area 8 of the first recording layer 43 is sandwiched between the lead-in area 4 and the middle area 7 so that the track 2 can be followed even if the optical head overruns. The user data area 8 is sandwiched between the middle area 7 and the lead-out area 6. The role of the middle area 7 is the same as that of the lead-out area 6. As shown in FIG. 4D, as in the case of the parallel path described above, the PSN and LSN of the recording layers 43 and 44 are assigned so as to increase in the order of the reproduction direction. However, since the spiral direction of the track 2 of the second recording layer 44 is opposite to the spiral direction of the track 2 of the first recording layer 43, the relationship between the sector number and the radial direction changes. In the user data area 8 of the first recording layer 43, the LSN becomes 0 at the innermost circumferential position, and increases by 1 as it goes to the outer circumferential side. The LSN at the outermost peripheral position of the user data area 8 of the second recording layer 44 is a number obtained by adding 1 to the maximum LSN of the user data area 8 of the first recording layer 43, and proceeds toward the inner peripheral side. Increase by one.

  Up to this point, the reproduction-only optical disc has been described, but the following description is specific to the rewritable optical disc. Those matters are derived from the fact that the margin for the recording operation is stricter than the reproducing operation.

FIG. 5 shows an area layout of the recording layer 45 provided in a DVD-RAM which is a DVD rewritable disc. The DVD-RAM includes only one recording layer (that is, the recording layer 45). In the recording layer 45 shown in FIG. 5, a disk information area 10, an OPC (Optimum Power Calibration) area 11, and a defect management area 12 are provided in the lead-in area 4. A defect management area 12 is provided in the lead-out area 6. Spare areas 13 are provided between the lead-in area 4 and the user data area 8, and between the user data area 8 and the lead-out area 6, respectively.

  The disc information area 10 stores disc information related to parameters and formats necessary for recording / reproducing data on the optical disc. The disc information area 10 is also included in a read-only optical disc, but only the format identifier for identifying the disc is stored in the disc information area of the read-only optical disc. On the other hand, in the rewritable optical disk, recommended values such as the power and pulse width of the laser beam for recording are stored in detail for each mark width to be generated. The disc information area 10 is usually a read-only area in which information is written at the time of disc formation. The DVD-RAM has the same uneven pits as the DVD-ROM (in addition to the uneven pits, the CD-RW). Some of them superimpose information on a meandering pattern of grooves (called wobble).

  The OPC area 11 is an area for adjusting the optimum recording power of the laser beam. The disk manufacturer describes the recommended recording laser parameters in the disk information area 10, and the laser element used by the disk manufacturer to obtain the recommended value and the laser element mounted in the optical disk drive device Is different in laser characteristics such as wavelength and rise time of laser power. Further, even in the case of laser elements of the same optical disk drive device, the laser characteristics vary depending on the ambient temperature and deterioration with time. Therefore, the optimum recording power is obtained by performing trial recording in the OPC area 11 while changing the power value around the laser parameter described in the disk information area 10.

  The defect management area 12 and the spare area 13 are prepared for defect management in which a sector in which recording / reproduction on the user data area 8 cannot be correctly performed (referred to as a defective sector) is replaced with another sector in good condition. It is an area. In a rewritable single-layer optical disk, defect management is generally performed, such as a 90 mm magneto-optical disk of ISO / IEC10090 standard.

  The spare area 13 is an area including a sector for replacing a defective sector (referred to as a spare sector. In particular, a sector that has been replaced with a defective sector is referred to as a replacement sector). In the DVD-RAM, spare areas 13 are arranged at two locations on the inner circumference side and the outer circumference side of the user data area 8, and spare areas 13 arranged on the outer circumference side so as to be able to cope with an increase in defective sectors more than expected. Can be expanded in size.

  The defect management area 12 includes a disk definition structure (DDS) 20 that holds a format related to defect management including management of the size and arrangement location of the spare area 13, and a defect list that lists the positions of the defective sectors and their replacement sectors. (DL) 21. With regard to the defect management area 12, in consideration of robustness, there are many optical discs having specifications that record the same contents in a total of four layers, that is, two in each of the defect management areas 12 on the inner peripheral side and the outer peripheral side. Further, as in the 650 MB phase change optical disc (PD) standard, when a spare area is secured in the defect management area 12 and the sector storing the DL 21 becomes a defective sector, the spare area sector is changed. Some have been devised to store DL21.

  In the above structure, the system including the optical disc drive device has the same data reliability as the read-only optical disc on the rewritable optical disc under the condition that the recording operation has a stricter physical property margin than the reproduction operation. It is prepared to secure.

However, although there is a read-only information recording medium having a plurality of recording layers, only the rewritable information recording medium having one recording layer exists as the rewritable information recording medium. In the above-described defect management in the rewritable information recording medium, only one recording layer is managed. There is no document disclosed about defect management in an information recording medium having a plurality of recording layers. If, simply, independent defect management is applied to each recording layer, the spare area of another recording layer is depleted, but the spare area of a certain recording layer is depleted. This causes a problem that the defective sector cannot be replaced. Further, when a spare area is arbitrarily assigned for each recording layer, when the track is an opposite path (see FIGS. 4A to 4D), the focus of the laser beam is two layers from the user data area of the first recording layer. There also arises a problem that the radius position of the folding position for moving to the user data area of the eye recording layer is shifted from each other and the access becomes slow.

  In view of the above problems, the present invention provides a multi-layer information recording medium, an information recording method, and an information reproducing method that can effectively use spare areas and improve access performance by devising the arrangement of spare areas in a plurality of recording layers. An object is to provide an information recording device and an information reproducing device.

  A multilayer information recording medium having a plurality of recording layers according to the present invention has a user data area for recording user data and a substitute for the at least one defective area when there is at least one defective area in the user data area. A plurality of spare areas including at least one alternate area that can be used for the first recording layer, and the plurality of recording layers include a first recording layer and a second recording layer adjacent to each other, and the first recording layer Are provided with a first user data area that is a part of the user data area and a first spare area that is one of the plurality of spare areas, and the second recording layer. Are provided with a second user data area which is another part of the user data area and a second spare area which is another one of the plurality of spare areas. 1 special The area is arranged adjacent to the first user data area, and the second spare area is arranged adjacent to the second user data area. The second spare area is arranged at substantially the same radial position of the multilayer information recording medium, thereby achieving the object.

  In the first user data area, logical addresses are assigned in the direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the multilayer information recording medium. A logical address is assigned to the data area in a direction from the outer peripheral side to the inner peripheral side of the multilayer information recording medium along the circumferential direction of the multilayer information recording medium, and is assigned to the first user data area. The logical address and the logical address assigned to the second user data area are continuous, and the first spare area is a maximum of a plurality of sectors included in the first user data area. Are arranged adjacent to the sector to which the logical address is assigned, and the second spare area is a plurality of sectors included in the second user data area. , It may be arranged so as to be adjacent to the sector where the smallest logical address is assigned.

  A multilayer information recording medium having a plurality of recording layers according to the present invention includes a user data area for recording user data and a plurality of OPC areas for adjusting the recording power of laser light. Each of the layers includes a corresponding one of the plurality of OPC regions, thereby achieving the purpose.

  An adjustment result storage area for storing the adjustment result of the recording power of the laser beam may be further included, and the adjustment result storage area may be provided at least in a reference layer serving as a reference among the plurality of recording layers.

The plurality of recording layers include a first recording layer and a second recording layer that are adjacent to each other, and the first recording layer includes a first user data area that is a part of the user data area. The second recording layer is provided with a second user data area which is another part of the user data area, and the first user data area includes the multilayer information. A logical address is assigned in the direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the recording medium, and the second user data area has a circumferential direction of the multilayer information recording medium. A logical address may be assigned along the direction from the outer peripheral side to the inner peripheral side of the multilayer information recording medium.

  The plurality of recording layers include a first recording layer and a second recording layer that are adjacent to each other, and the first recording layer includes a first user data area that is a part of the user data area. The second recording layer is provided with a second user data area which is another part of the user data area, and the first user data area includes the multilayer information. A logical address is assigned in the direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the recording medium, and the second user data area has a circumferential direction of the multilayer information recording medium. A logical address may be assigned in a direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the line.

  A multilayer information recording medium having a plurality of recording layers according to the present invention has a user data area for recording user data and a substitute for the at least one defective area when there is at least one defective area in the user data area. And at least one spare area including at least one replacement area, wherein the user data area includes a plurality of sectors, and each of the plurality of sectors is assigned a logical address, and the at least one spare area is used. One of the two spare areas is arranged adjacent to the sector to which the largest logical address is allocated among the plurality of sectors included in the user data area, and is expandable. This achieves the above object.

  The spare area adjacent to the sector to which the maximum logical address is assigned may be expandable in the direction from the spare area toward the user data area.

  The plurality of recording layers include a first recording layer and a second recording layer that are adjacent to each other, and the first recording layer includes a first user data area that is a part of the user data area. The second recording layer is provided with a second user data area which is another part of the user data area, and the first user data area includes the multilayer information. A logical address is assigned in the direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the recording medium, and the second user data area has a circumferential direction of the multilayer information recording medium. A logical address may be assigned along the direction from the outer peripheral side to the inner peripheral side of the multilayer information recording medium.

  The plurality of recording layers include a first recording layer and a second recording layer that are adjacent to each other, and the first recording layer includes a first user data area that is a part of the user data area. The second recording layer is provided with a second user data area which is another part of the user data area, and the first user data area includes the multilayer information. A logical address is assigned in the direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the recording medium, and the second user data area has a circumferential direction of the multilayer information recording medium. A logical address may be assigned in a direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the line.

In the recording apparatus for recording information on a multilayer information recording medium having a plurality of recording layers according to the present invention, the multilayer information recording medium includes at least a user data area for recording user data and a user data area. A plurality of spare areas including at least one replacement area that can be used instead of the at least one defective area when there is one defective area, and the plurality of spare areas are included in the plurality of recording layers. Provided in at least two recording layers, the recording apparatus includes an optical head unit capable of optically writing the information to the multilayer information recording medium from one side of the multilayer information recording medium, and the optical head. A controller that controls execution of the defect management process using the unit, and the defect management process is at least usable among the plurality of spare areas. A step of identifying one spare area, a step of determining whether or not a defective area exists in the user data area, and if it is determined that the defective area exists, the at least one spare area identified Of these, the method includes a step of selecting a spare region having the shortest distance from the defective region, and a step of replacing the defective region with a replacement region included in the selected spare region, thereby achieving the object. The

  In the recording apparatus for recording information on a multilayer information recording medium having a plurality of recording layers according to the present invention, the multilayer information recording medium includes at least a user data area for recording user data and a user data area. A plurality of spare areas including at least one replacement area that can be used instead of the at least one defective area when there is one defective area, and the plurality of spare areas are included in the plurality of recording layers. Provided in at least two recording layers, each of the plurality of recording layers includes a part of the user data area, and the recording apparatus is configured to receive the multi-layer information recording medium from one side of the multi-layer information recording medium. An optical head unit capable of optically writing the information on the information recording medium, and a control for controlling execution of defect management processing using the optical head unit. The defect management process includes: identifying at least one available spare area among the plurality of spare areas; and determining whether a defect area exists in the user data area; When it is determined that the defective area exists, at least one of the specified at least one spare area is recorded on the recording layer in which the area where the defective area is a part of the user data area is arranged. And determining that none of the specified at least one spare area is arranged in the recording layer in which the area where the defective area exists is arranged. A step of selecting a spare area having the shortest distance from the defective area among the specified at least one spare area; and The Recessed region includes a step of alternating the replacement area contained in the spare area selected above, the objects can be achieved.

  In the recording method for recording information on a multilayer information recording medium having a plurality of recording layers according to the present invention, the multilayer information recording medium includes at least a user data area for recording user data and the user data area. A plurality of spare areas including at least one replacement area that can be used instead of the at least one defective area when there is one defective area, and the plurality of spare areas are included in the plurality of recording layers. Provided in at least two recording layers, the recording method includes a step of identifying at least one usable spare area among the plurality of spare areas, and whether or not a defective area exists in the user data area. And determining the presence of the defective area, the at least one spare area identified above is determined. Selecting a spare area having the shortest distance from the defective area; and replacing the defective area with a replacement area included in the selected spare area, thereby achieving the object. .

In the recording method for recording information on a multilayer information recording medium having a plurality of recording layers according to the present invention, the multilayer information recording medium includes at least a user data area for recording user data and the user data area. A plurality of spare areas including at least one replacement area that can be used instead of the at least one defective area when there is one defective area, and the plurality of spare areas are included in the plurality of recording layers. Provided in at least two recording layers, each of the plurality of recording layers is provided with a part of the user data area, and the recording method is at least usable among the plurality of spare areas. Identifying one spare area; determining whether a defective area exists in the user data area; and When it is determined that there is an area, at least one of the specified at least one spare area is arranged on the recording layer where the area where the defective area that is a part of the user data area exists is arranged. And when determining that none of the specified at least one spare area is arranged in the recording layer in which the area where the defective area exists is arranged, A step of selecting a spare region having the shortest distance from the defective region out of the specified at least one spare region, and a step of replacing the defective region with a replacement region included in the selected spare region. This achieves the above object.

  According to the multilayer information recording medium of the present invention, defect management information for all recording layers is stored in one recording layer. As a result, since the defect management information of all the recording layers can be grasped only by accessing one recording layer, continuous access performance can be improved.

  According to the multilayer information recording medium of the present invention, the first spare area disposed adjacent to the first user data area and the second spare disposed adjacent to the second user data area. The area is arranged at substantially the same radial position on the multilayer information recording medium. As a result, when the focal position of the laser beam from the first user data area to the second user data area is switched, the moving distance in the radial direction of the optical head is ideally zero, so that continuous access is performed. Performance can be improved.

  According to the multilayer information recording medium of the present invention, the detected defective sector can be replaced with a spare area of an arbitrary recording layer, so that the spare area can be used effectively and the reliability of data can be improved. .

  According to the multilayer information recording medium of the present invention, by expanding the size of the spare area, it is possible to replace the defective sector with the spare sector even if the number of defective sectors is larger than expected, thereby improving the data reliability. be able to.

  According to the multilayer information recording medium of the present invention, a continuous LSN between user data areas of each recording layer is assigned to each user data area. As a result, common defect management can be applied between the multilayer information recording medium in which the recording / reproducing direction of each recording layer is the same and the multilayer information recording medium in which the recording / reproducing direction of each recording layer is alternately opposite. And development costs can be reduced.

  According to the multilayer information recording medium of the present invention, the control information area such as the area storing the recording / reproducing parameter and the area storing the defect management information is arranged in one recording layer. As a result, since the control information of all the recording layers can be grasped only by accessing one recording layer, continuous access performance can be improved.

  According to the multilayer information recording medium of the present invention, by arranging the control information area in the reference layer, a reliable recording / reproducing operation for the information in the control information area can be performed.

  According to the multilayer information recording medium of the present invention, the optimum recording power can be adjusted for each recording layer by arranging the OPC area for adjusting the recording power in all the recording layers.

  According to the information reproducing method and information reproducing apparatus of the present invention, information can be reproduced from a multilayer information recording medium including defect management information related to a plurality of recording layers.

  According to the information recording method and the information recording apparatus of the present invention, information can be recorded on a multilayer information recording medium including defect management information regarding a plurality of recording layers.

  According to the information recording method and the information recording apparatus of the present invention, spare sectors are allocated with an emphasis on shortening the seek time in the radial direction by replacing the defective sectors with spare sectors included in a spare area having a short distance from the defective sector. Can do.

  According to the information recording method and information recording apparatus of the present invention, the recording power setting time is shortened by replacing the defective sector with a spare sector included in a spare area arranged in the same recording layer as the recording layer in which the defective sector exists. Spare sectors can be allocated with emphasis on

(Embodiment 1)
The multilayer information recording medium of Embodiment 1 of the present invention will be described below with reference to the drawings. In the present invention, a multilayer information recording medium refers to an information recording medium having two or more recording layers.

  FIG. 6 is a diagram showing an area layout of the multilayer information recording medium 50 according to Embodiment 1 of the present invention. The multilayer information recording medium 50 includes two recording layers 51 and 52. The multilayer information recording medium 50 includes a user data area 5 for recording user data. In the embodiment of the present invention, the upper layer of the plurality of recording layers in the drawing is referred to as a first recording layer, and the lower layer is referred to as a second recording layer. The first recording layer 51 is a first portion that is a part of the lead-in area 101, the head spare area 105, and the user data area 5 from the inner circumference side to the outer circumference side, which is the same direction as the recording / reproducing direction. User data area 15, intermediate spare area 106, and middle area 102. The second recording layer 52 is a middle area 103, an intermediate spare area 106 ', and a second part of the user data area 5 from the outer circumference side to the inner circumference side, which is the same direction as the recording / reproducing direction. User data area 16, final spare area 107, and lead-out area 104.

  Each of the head spare area 105, the intermediate spare area 106, the intermediate spare area 106 ′, and the final spare area 107 is at least one defective area in the user data area 5 (in the embodiment of the present invention, the defective area is a defective sector). If there is at least one replacement area that can be used in place of at least one defective sector (in the embodiment of the present invention, the replacement area is a spare sector).

  The lead-in area 101 includes a disk information area 10, an OPC area 11, and a defect management area 12. The middle area 102 includes a defect management area 12. The lead-out area 104 includes the OPC area 11. The defect management area 12 includes a DDS 20 and a DL 21.

  The disc information area 10 is provided in the first recording layer 51. In the disc information area 10, recording and reproduction recommended individually for both the first and second recording layers 51 and 52, respectively. The parameter is stored. Accordingly, the parameters for all the recording layers 51 and 52 of the multilayer information recording medium 50 can be obtained only by accessing the first recording layer 51, which is advantageous in that the processing speed can be increased.

  The defect management area 12 is provided in the first recording layer 51 and includes defect management information related to defect management of both the first and second recording layers 51 and 52. That is, the DDS 20 describes information about the head spare area 105, the intermediate spare area 106, and the final spare area 107. The DL 21 lists the positions of defective sectors in both the first and second recording layers 51 and 52 and the position of the replacement sector at the replacement destination. This makes it possible to obtain information relating to all defect management of the multilayer information recording medium 50 only by accessing the first recording layer 51, which is advantageous in that the processing speed can be increased.

  The head spare area 105 and the intermediate spare area 106 are arranged adjacent to both ends of the user data area 15. Further, the intermediate spare area 106 ′ and the final spare area 107 are arranged so as to be adjacent to both ends of the user data area 16. This is because sequential recording / reproduction along the recording / reproducing direction is performed as compared with the case where each of the spare areas 105 to 107 is arranged at a position where one of the first and second user data areas 15 and 16 is divided halfway. There is a merit that it can be done at high speed. Further, the intermediate spare area 106 and the intermediate spare area 106 ′ are arranged at equal radial positions on the multilayer information recording medium 50. With this arrangement, when the focal position of the laser beam is switched from the first user data area 15 of the first recording layer 51 to the second user data area 16 of the second recording layer 52, the optical head portion Since the moving distance in the radial direction is ideally 0, faster access can be realized. Here, ideally, the deviation when the first recording layer 51 and the second recording layer 52 are bonded together, or the eccentricity of the disc while the focal position of the laser beam is switched. This is because a slight displacement of the laser beam in the radial direction is necessary.

  The OPC area 11 for adjusting the recording power of the laser beam is provided in both the first and second recording layers 51 and 52, respectively. Because the recording layer thickness is adjusted so that one recording layer is translucent while the other recording layer is totally reflected, the recording characteristics are different for each recording layer. is there. Therefore, the OPC area 11 is provided in each of the recording layers 51 and 52 so that the recording power of the laser beam can be adjusted separately for the first recording layer 51 and the second recording layer 52.

  Note that the storage area for control information other than the disk information area 10 and the defect management area 12, such as the adjustment result storage area 14 for storing the adjustment result of the recording power of the laser beam, also takes the processing speed into consideration as described above. It is desirable to arrange in the first recording layer 51.

  The size of the head spare area 105, the size of the intermediate spare area 106, and the size of the final spare area 107 may each be zero. For example, even if the size of the first spare area 105 and the intermediate spare area 106 is non-zero and the size of the final spare area 107 is 0, the above-described advantages are not changed.

  FIG. 7 shows the data structure of DDS 20 in Embodiment 1 of the present invention. The data of the DDS 20 includes a DDS identifier 201, an LSN0 position 202, a head spare area size 203, an intermediate spare area size 204, a final spare area size 205, a first layer final LSN 206, a second layer final LSN 207, And a spare depletion flag group 208. The DDS identifier 201 indicates that this data structure is DDS. The LSN0 location 202 indicates the PSN (ie physical address) of the sector whose LSN (ie logical address) is 0. The head spare area size 203 indicates the number of sectors in the head spare area 105. The intermediate spare area size 204 indicates the number of sectors in the intermediate spare area 106. The final spare area size 205 indicates the number of sectors in the final spare area 107. The first layer last LSN 206 indicates the LSN assigned to the last sector of the first user data area 15 of the first recording layer 51, which is equal to the number of sectors in the first user data area 15. The second layer final LSN 207 indicates the LSN assigned to the last sector of the second user data area 16 of the second recording layer 52, which is the number of sectors in the first user data area 15 and the second user data area 15. It is equal to the sum of the number of sectors in the data area 16. The spare depletion flag group 208 includes a flag group indicating whether or not there is a usable spare sector in each of the spare areas 105 to 107.

FIG. 8 shows an example of the spare depletion flag group 208. The first spare area depletion flag 221 corresponds to the first spare area 105, the first layer intermediate spare area depletion flag 222 corresponds to the intermediate spare area 106, and the second layer intermediate spare area depletion flag 223 corresponds to the intermediate spare area 106 ′. The final spare area depletion flag 224 corresponds to the final spare area 107. The spare exhaustion flag group 208 only needs to include flags corresponding to the spare areas 105 to 107, and the arrangement of the flags is not limited to this.

FIG. 9 shows the data structure of DL 21 in Embodiment 1 of the present invention. The DL 21 data includes a DL identifier 301, a DL entry number 302, and zero or more DL entries 303. The DL identifier 301 indicates that this data structure is DL. The DL entry number 302 indicates the number of DL entries 303. The DL entry 303 includes information regarding the defective sector position 304 and the replacement sector position 305. As the defective sector position 304, the PSN of the defective sector is stored. As the replacement sector position 305, the PSN of the replacement sector is stored. The PSN includes a layer number 306 and an intra-layer sector number 307. The layer number 306 only needs to be a value for identifying the recording layers. For example, the layer number 306 is 0 for the first recording layer 51 and 1 for the second recording layer 52. The intra-layer sector number 307 only needs to be a value for identifying each sector in a certain recording layer, and is a number that increases by 1 every time one sector advances in the recording / reproducing direction, for example. Similarly to the opposite path of the DVD-ROM, the relationship between the PSN values of sectors arranged at the same radial position between the first recording layer 51 and the second recording layer 52 is represented by 2 The above-mentioned condition is satisfied even in the complement relation. For example, PSN is represented by 28 bits, and PSN of the first recording layer 51 is in the range of 0000000h to 0FFFFFFh (h indicates a hexadecimal number). If the PSN of a certain sector of the first recording layer 51 is 0123450h, the PSN of the sector of the second recording layer 52 arranged at the same radial position is FEDCBAFh (the following procedures (1) to ( See 4)).
(1) 0 1 2 3 4 5 0: Hexadecimal number (2) 0000 0001 0010 0011 0100 0101 0000: Binary number (3) 1111 1110 1101 1100 1011 1010 1111: Bit-reversed binary number (4) FE D C B A F: The hexadecimal most significant bit is always 0 in the PSN of the first recording layer 51 and is always F in the PSN of the second recording layer 52, so this most significant bit can be considered as the layer number 306. That's fine. The PSN of the next sector is 0123451h in the order of the recording / reproducing direction (from the inner circumference side to the outer circumference side) of the first recording layer 51. The PSN of the next sector in the order of the recording / reproducing direction (from the outer peripheral side to the inner peripheral side) of the second recording layer 52 is FEDCBB0h. If the most significant bit having the layer number 306 is removed from these PSNs, the intra-layer sector number 307 is obtained. In the intra-layer sector number 307, the current sector of the first layer is 123450h, the next sector is 123451h, the current sector of the second layer is EDCBAFh, and the next sector is EDCBB0h.

  Using the DL 21 of the present invention, not only the defective sector is replaced with a spare sector included in a spare area provided in the same recording layer as the recording layer in which the defective sector is found, but also the recording layer in which the defective sector is found The spare sector included in the spare area provided in a different recording layer can be replaced. For example, the DL entry 303 in which the defective sector position 304 indicates the PSN in the first recording layer 51 and the replacement sector position 305 indicates the PSN in the second recording layer 52 is in the first recording layer 51. It shows that the defective sector in the first user data area 15 is replaced with a spare sector in the second recording layer 52. If a defect list is composed of DL entries that cannot identify a recording layer as in the prior art, the replacement process cannot be performed if a defective sector exceeds the number of spare sectors arranged in a certain recording layer. Therefore, according to the first embodiment of the present invention, a defective sector can be replaced with a spare sector until the spare sectors of all recording layers are used up, and the spare area can be used effectively.

FIG. 10 shows sector number assignment in the first embodiment of the present invention. From left to right in the figure, the recording layer 51 is disclosed from the inner circumference side to the outer circumference side, and from the outer circumference side to the inner circumference side of the second recording layer 52. Accordingly, from the left to the right in the drawing, the head spare area 105, the first user data area 15, the intermediate spare area 106, the intermediate spare area 106 ', the second user data area 16, and the final spare area 107 are sequentially arranged. They are lined up and each area includes a plurality of sectors. In the first recording layer 51, the PSN increases by 1 every time one sector advances toward the outer peripheral side, and in the second recording layer 52, the PSN increases by one every time one sector advances toward the inner peripheral side. As the PSN, the numerical range excluding the layer number may be the same range for the first recording layer 51 and the second recording layer 52 (that is, included in the first spare area 105 of the first recording layer 51). The minimum PSN of the sector and the minimum PSN of the sector included in the intermediate spare area 106 of the second recording layer 52 are equal except for the layer number, and the sector included in the intermediate spare area 106 of the first recording layer 51 The maximum PSN and the maximum PSN of the sector included in the final spare area 107 of the second recording layer 52 are equal except for the layer number). Or, similar to the opposite path of DVD-ROM, the PSN value relationship between sectors at the same radial position between the first recording layer 51 and the second recording layer 52 is a two's complement relationship. It may be.

  The LSN is assigned only to a plurality of sectors included in the user data area 5. LSNs are assigned to the first user data area 15 along the circumferential direction of the multilayer information recording medium 50. LSNs are also assigned to the second user data area 16 along the circumferential direction. The LSN assigned to the first user data area 15 and the LSN assigned to the second user data area 16 are continuous.

  In the first user data area 15 of the first recording layer 51, 0 is assigned as the LSN of the sector at the innermost circumference, and the LSN increases by 1 for each sector from the inner circumference to the outer circumference. To do. In the second user data area 16 of the second recording layer 52, the LSN of the sector at the outermost peripheral position is the maximum LSN assigned to the first user data area 15 of the first recording layer 51. A value obtained by adding 1 is assigned, and the LSN increases by 1 for each sector from the outer peripheral side toward the inner peripheral side. In this way, logical addresses are assigned to the second user data area 16 in a direction opposite to the logical address assignment direction for the first user data area 15.

  The intermediate spare area 106 is arranged so as to be adjacent to the sector to which the maximum logical address is assigned among the plurality of sectors included in the first user data area 15. Further, the intermediate spare area 106 ′ is arranged so as to be adjacent to the sector to which the minimum logical address is assigned among the plurality of sectors included in the second user data area 16. As described above, the intermediate spare area 106 and the intermediate spare area 106 ′ are arranged at equal radial positions on the multilayer information recording medium 50. Therefore, the sector to which the maximum logical address of the first user data area 15 is allocated and the sector to which the minimum logical address of the second user data area 16 is allocated are at the same radial position on the multilayer information recording medium 50. Will be placed. With this arrangement, when the focal position of the laser beam is switched from the sector to which the maximum logical address of the first user data area 15 is assigned to the sector to which the minimum logical address of the second user data area 16 is assigned, The moving distance of the laser beam in the radial direction can be ideally zero.

  The fact that the size of the spare area can be increased even if user data has already been recorded in the user data area 5 will be described with reference to FIG. The final spare area 107 is arranged so as to be adjacent to the sector to which the maximum LSN is allocated among the plurality of sectors included in the user data area 5. The final spare area 107 can be expanded in the direction from the final spare area 107 toward the second user data area 16 (that is, the direction of the arrow 107 ′ shown in FIG. 10).

First, before expanding the final spare area 107 in the direction of the arrow 107 ′, the user data recorded in the area to be expanded in the second user data area 16 is moved to another area in the user data area 5. . Next, the file management information (one of the information managed by the file system) of the moved user data is corrected to indicate the destination sector position. Next, the size change of the user data area 5 is reflected in the volume space management information (one piece of information managed by the file system). Finally, the size of the outermost peripheral spare area 107 is expanded. Incidentally, it is impractical to expand the sizes of the head spare area 105 and the intermediate spare areas 106 and 106 ′. This is because, when the sizes are expanded, the allocation of the LSN to the user data area 5 changes, and the file system that manages the user data area 5 using the LSN fails.

  As described above, according to Embodiment 1 of the present invention, continuous access performance can be improved in a multilayer information recording medium having two recording layers. Further, since the defective sector can be replaced with a spare area of an arbitrary recording layer, the spare area can be effectively used. Further, the reliability of the data can be improved by expanding the size of the spare area to prevent the occurrence of the spare area shortage.

(Embodiment 2)
Hereinafter, a multilayer information recording medium according to Embodiment 2 of the present invention will be described with reference to the drawings.

  First, a reference layer serving as a reference among a plurality of recording layers included in a multilayer information recording medium will be described. 11A, 11B, and 11C are diagrams illustrating the layout of the recording layer of the information recording medium according to Embodiment 2. FIG. FIG. 11A shows a layer layout of the information recording medium 53 having one recording layer 402. 11A, the information recording medium 53 includes a transparent resin 401, a total reflection recording layer 402, and a substrate 400 in the order along the laser light incident direction. Here, the total reflection recording layer 402 is located at a depth d from the surface of the transparent resin 401 on which the laser light is incident. FIG. 11B and FIG. 11C show the layer layout of the information recording media 54 and 55 including the three recording layers 402, 403, and 404. The semi-transparent recording layers 403 and 404 are laid out so as to be sandwiched by the transparent resin 401 in the direction in which the laser light enters from the total reflection recording layer 402 provided on the substrate 400. In the information recording medium 54 in FIG. 11B, the total reflection recording layer 402 is located at a depth d from the surface on which the laser beam of the outermost transparent resin 401 is incident, and in the information recording medium 55 in FIG. The difference of the layer 403 is between the information recording medium 54 and the information recording medium 55.

  Normally, the optical head portion is designed so that an optimum light spot can be obtained at the position of the depth d. Therefore, the recording layer located at the depth d is referred to as a reference layer. Therefore, it is desirable to arrange an area for storing important information, for example, the disk information area 10 and the defect management area 12 in this reference layer. The recording layer 51 in which the disc information area 10, the defect management area 12, and the adjustment result storage area 14 shown in FIG. 6 are arranged is a reference layer.

  In the following description, the recording layers are referred to as the first recording layer, the second recording layer, the third recording layer,. For example, in the multilayer information recording medium 54 shown in FIG. 11B, the total reflection recording layer 402 is the first recording layer, the semitransparent recording layer 403 is the second recording layer, and the semitransparent recording layer 404 is the third layer. Called the recording layer. For example, in the multilayer information recording medium 55 shown in FIG. 11C, the semitransparent recording layer 403 is the first recording layer, the semitransparent recording layer 404 is the second recording layer, and the total reflection recording layer 402 is three. This is called the recording layer of the first layer. As described above, the numbering of the recording layers does not necessarily depend on the upper and lower arrangement relationships of the recording layers. Here, the case where three recording layers are provided has been described, but the same applies to all information recording media provided with two or more recording layers.

FIG. 12 shows an area layout of the multilayer information recording medium 56 in Embodiment 2 of the present invention. The multilayer information recording medium 56 includes three recording layers 57, 58 and 59. The multilayer information recording medium 56 includes a user data area 5 for recording user data. The first recording layer 57 is a first part which is a part of the lead-in area 101, the head spare area 105, and the user data area 5 from the inner circumference side to the outer circumference side, which is the same direction as the recording / reproducing direction. User data area 17, intermediate spare area 106, and middle area 102. The second recording layer 58 is a middle area 103, an intermediate spare area 106 ′, and a second part of the user data area 5 from the outer circumference side to the inner circumference side, which is the same direction as the recording / reproducing direction. User data area 18, intermediate spare area 108, and middle area 109. The third recording layer 59 is a third area that is a part of the middle area 109, the intermediate spare area 108 ′, and the user data area 5 from the inner circumference side to the outer circumference side, which is the same direction as the recording / reproducing direction. User data area 19, final spare area 107, and lead-out area 104. The lead-in area 101 includes a disk information area 10, an OPC area 11, and a defect management area 12. The middle area 102 includes a defect management area 12. The middle area 109 includes the OPC area 11. The defect management area 12 includes a DDS 20 and a DL 21.

  The disc information area 10 is provided in the first recording layer 57. The disc information area 10 stores individually recommended recording / reproducing parameters for all the recording layers 57, 58 and 59. . Thus, the parameters for all the recording layers 57, 58, and 59 of the multilayer information recording medium 56 can be obtained only by accessing the first recording layer 57, which is advantageous in that the processing speed can be increased.

  The defect management area 12 is provided in the first recording layer 57 and includes defect management information relating to defect management of all the recording layers 57, 58 and 59. That is, the DDS 20 describes information regarding the head spare area 105, the intermediate spare areas 106, 106 ', 108 and 108', and the final spare area 107. The DL 21 lists the positions of defective sectors in all the recording layers 57, 58 and 59 and the positions of the replacement sectors to be replaced. According to this, since only information on the first recording layer 57 is accessed, information regarding all defect management of the multilayer information recording medium 56 can be obtained, which is advantageous in that the processing speed can be increased.

  Any of the spare areas 105 to 108 ′ of each of the recording layers 57 to 59 is arranged at a position adjacent to any one of the first to third user data areas 17 to 19. This means that sequential recording / reproduction along the recording / reproducing direction can be performed at a higher speed than when a spare area is arranged at a position where one of the first to third user data areas 17-19 is divided halfway. There are benefits. Further, the intermediate spare area 106 and the intermediate spare area 106 'arranged on the outer peripheral side of the recording layers 57 and 58 are arranged at the same radial position. With this arrangement, when the focal position of the laser light from the first user data area 17 to the second user data area 18 is switched, the moving distance in the radial direction of the optical head unit is ideally 0. High-speed access can be realized. Further, the intermediate spare area 108 and the intermediate spare area 108 'arranged on the inner peripheral side of the recording layers 58 and 59 are arranged at the same radial position. With this arrangement, when the focal position of the laser light from the second user data area 18 to the third user data area 19 is switched, the moving distance in the radial direction of the optical head unit is ideally 0, so that High-speed access can be realized. Here, ideally, since there is a deviation when the recording layers 57 to 59 are bonded to each other and a deviation of the eccentricity of the disk while switching the focal position of the laser beam, a slight radius is generated. This is because it is necessary to move the laser beam in the direction.

  The OPC area 11 is provided in all the recording layers 57 to 59. This is because the recording layers 57 to 59 have different recording characteristics. Therefore, the OPC area 11 is provided in each of the recording layers 57 to 59 so that the recording power can be adjusted separately in any recording layer.

The size of the first spare area 105, the size of the intermediate spare areas 106, 106 ′, 108 and 108 ′, and the size of the final spare area 107 may be set to 0, respectively. For example, even if the size of the first spare area 105 and the intermediate spare areas 106, 106 ′, 108 and 108 ′ is non-zero and the size of the final spare area 107 is zero, the above-described advantages are not changed.

  FIG. 13 shows the data structure of DDS 20 in the second embodiment of the present invention. The DDS 20 includes a DDS identifier 201, the number of recording layers 209, an LSN0 position 202, a head spare area size 203, an inner peripheral intermediate spare area size 210, an outer peripheral intermediate spare area size 211, and a final spare area size 205. , First layer user data area size 212, intermediate layer user data area size 213, last layer user data area size 214, and spare depletion flag group 208. The same components as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The number of recording layers 209 indicates the total number of recording layers. The inner circumference side intermediate spare area size 210 indicates the number of sectors in the inner circumference side intermediate spare areas 108 and 108 '. The outer peripheral side intermediate spare area size 211 indicates the number of sectors in the outer peripheral side intermediate spare areas 106 and 106 '. The first layer user data area size 212 indicates the number of sectors in the first user data area 17. Since this is equal to the maximum value of the LSN assigned to the first user data area 17, it is actually the same as the first layer final LSN 206 in the first embodiment. The intermediate layer user data area size 213 indicates the number of sectors in the second user data area 18. The final layer user data area size 214 indicates the number of sectors in the third user data area 19.

  The DDS 20 shown in FIG. 13 can also be applied to a multilayer information recording medium having two or more arbitrary recording layers. For example, when it is applied to a multilayer information recording medium having four recording layers, it is as follows. The number of recording layers 209 is 4. The intermediate layer user data area size 213 indicates the number of sectors in the user data area of the second recording layer, and also indicates the number of sectors in the user data area of the third layer. The final layer user data area size 214 indicates the number of sectors in the fourth layer user data area.

  As long as the inner peripheral intermediate spare areas 108 and 108 'and the outer peripheral intermediate spare areas 106 and 106' contain the same number of sectors, the inner peripheral intermediate spare area size 210 and the outer peripheral intermediate spare area size 211 Is a single field, which is equivalent to the intermediate spare area size 204 described in the first embodiment. Further, if the head spare area 105 and the inner peripheral intermediate spare areas 108 and 108 'include the same number of sectors, the head spare area size 203 and the inner peripheral intermediate spare area size 210 are combined into one field. . The first layer user data area size 212 and the intermediate layer user data area size 213 may be combined in one field. As described above, fields that have the same contents when limited and fields that are obtained by performing four arithmetic operations may be omitted.

  FIG. 14 is a diagram illustrating an example of the spare depletion flag group 208. The head spare area depletion flag 221 corresponds to the head spare area 105, the intermediate spare area depletion flag 222 of the first layer corresponds to the intermediate spare area 106, and the intermediate spare area depletion flag 225 on the outer peripheral side of the second layer is the intermediate spare area. The intermediate spare area depletion flag 226 on the inner peripheral side of the second layer corresponds to the intermediate spare area 108, and the intermediate spare area depletion flag 227 on the inner peripheral side of the third layer corresponds to the area 106 ′. The final spare area depletion flag 224 corresponds to the final spare area 107.

  As in the first embodiment, the data structure shown in FIG. 9 can be applied to the DL 21 in the second embodiment. If the layer number 306 is represented by 4 bits, a maximum of 16 recording layers can be expressed. Also in the second embodiment, it is obvious that the defective sector can be replaced with the spare sector until the spare sector of all the recording layers is used up, and the spare area can be effectively used.

  FIG. 15 shows sector number assignment in the second embodiment of the present invention. From left to right in the figure, from the inner circumference side to the outer circumference side of the first recording layer 57 and from the outer circumference side to the inner circumference side of the second recording layer 58, the third recording layer 59 from the inner peripheral side to the outer peripheral side. Therefore, from the left to the right in the figure, the head spare area 105, the first user data area 17, the intermediate spare area 106, the intermediate spare area 106 ', the second user data area 18, the intermediate spare area 108, the intermediate The spare area 108 ′, the third user data area 19, and the final spare area 107 are arranged in this order. In the first recording layer 57, the PSN increases by 1 every time one sector advances toward the outer peripheral side, and in the second recording layer 58, the PSN increases by one every time one sector advances toward the inner peripheral side. In 59, it increases by 1 every time one sector is advanced to the outer peripheral side. In recording layers adjacent to each other, LSN allocation directions of the respective recording layers are opposite to each other. As the PSN, the numerical range excluding the layer number may be the same between the first to third recording layers 57 to 59. Alternatively, the PSN allocation rule in the DVD-ROM opposite path is expanded so that the lower value of the PSN of the sectors at the same radial position between the odd-numbered layer and the even-numbered layer is complemented to 2 It is good. In this case, as the upper value of PSN, 0 is applied to the first and second recording layers, 1 is applied to the third and fourth recording layers, and the fifth and sixth layers. For example, 2 may be applied to the recording layer.

  The LSN is assigned only to sectors included in the user data area 5. In the first user data area 17, 0 is assigned as the LSN of the sector at the innermost peripheral position, and the LSN increases by one for each sector from the inner peripheral side toward the outer side. In the second user data area 18, the LSN of the sector at the outermost periphery position is assigned a value obtained by adding 1 to the maximum LSN assigned to the first user data area 17, and from the outer side to the inner periphery side. On the other hand, the LSN increases by 1 for each sector. In the third user data area 19, a value obtained by adding 1 to the maximum LSN assigned to the second user data area 18 is assigned as the LSN of the sector at the innermost circumference position. The LSN increases by 1 for each sector.

  Although the description is omitted because it is the same as in the first embodiment, the size of the outermost spare area 107 can be reduced even in a multilayer information recording medium having three or more recording layers even if user data has already been recorded in the user data area 5. Can be enlarged.

  As described above, according to Embodiment 2 of the present invention, continuous access performance can be improved in a multilayer information recording medium having two or more recording layers. Further, since the defective sector can be replaced with a spare area of an arbitrary recording layer, the spare area can be effectively used. Further, the reliability of the data can be improved by expanding the size of the spare area to prevent the occurrence of the spare area shortage.

(Embodiment 3)
Hereinafter, a multilayer information recording medium according to Embodiment 3 of the present invention will be described with reference to the drawings.

FIG. 16 shows an area layout of the multilayer information recording medium 60 according to Embodiment 3 of the present invention. The multilayer information recording medium 60 includes two recording layers 61 and 62. The recording and reproducing directions of the first and second recording layers 61 and 62 are the same. The multilayer information recording medium 60 includes a user data area 5 for recording user data. The first recording layer 61 includes a lead-in area 101, a head spare area 105, a first user data area 23 that is a part of the user data area 5, and an intermediate area from the inner circumference side toward the outer circumference side. A spare area 106 and a lead-out area 111 are included. The second recording layer 62 includes a lead-in area 110, an intermediate spare area 108, a second user data area 24 that is a part of the user data area 5, A spare area 107 and a lead-out area 104 are included. The lead-out area 111 includes the defect management area 12. The lead-in area 110 is an OPC
Region 11 is included. The same components as those described in the first embodiment or the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As the data structure of the DDS 20 in the third embodiment, the DDS 20 in the second embodiment shown in FIG. 13 can be applied. In this case, the intermediate layer user data area size 213 is only unnecessary.

  As the spare depletion flag group 208 in the third embodiment, the flag group shown in FIG. 8 can be applied.

  The data structure shown in FIG. 9 can be applied to the DL 21 in the third embodiment. Also in the third embodiment, it is obvious that a defective sector can be replaced with a spare area until the spare sectors of all recording layers are used up, and the spare area can be effectively used.

  FIG. 17 shows sector number assignment in the third embodiment of the present invention. From left to right in the figure, the recording layer 61 is disclosed from the inner circumference side to the outer circumference side and from the inner circumference side to the outer circumference side of the second recording layer 62. Therefore, from the left to the right in the figure, the head spare area 105, the first user data area 23, the intermediate spare area 106, the intermediate spare area 108, the second user data area 24, and the final spare area 107 are arranged in this order. . The PSN increases by 1 every time one sector advances from the inner circumference side to the outer circumference side in both the first recording layer 61 and the second recording layer 62. The PSNs of sectors at the same radial position in the first and second layers are the same except for the layer number. The LSN is assigned only to sectors included in the user data area 5. In the first user data area 23, 0 is assigned as the LSN of the sector at the innermost peripheral position, and the LSN increases by one for each sector from the inner peripheral side toward the outer side. In the second user data area 24, as the LSN of the sector at the innermost circumference position, a value obtained by adding 1 to the maximum LSN assigned to the first user data area 23 is assigned. The LSN increases by 1 for each sector.

  Even if there is a difference in the recording / reproducing direction of the recording layer between the multilayer information recording medium 50 of the first embodiment and the multilayer information recording medium 60 of the third embodiment, the allocation of the LSN and the arrangement of each spare area It is clear that the relationship is the same when comparing FIG. 10 and FIG. Therefore, as described in the first embodiment, even if user data is already recorded in the user data area 5, the size of the spare area can be increased.

  As described above, according to the third embodiment of the present invention, in a multilayer information recording medium having two or more recording layers, the multilayer information recording medium having the same recording / reproducing direction of each recording layer, Common defect management can be applied to multilayer information recording media whose recording / reproducing directions are alternately opposite, and the defective sector can be replaced by a spare area of an arbitrary recording layer, so that the spare area can be used effectively. Furthermore, the reliability of data can be improved by expanding the size of the spare area to prevent the occurrence of a spare area shortage.

(Embodiment 4)
Hereinafter, an embodiment of an information recording / reproducing apparatus that performs recording and reproduction using the multilayer information recording medium 50 described in the first embodiment will be described with reference to the drawings.

FIG. 18 is a block diagram showing an information recording / reproducing apparatus 500 in Embodiment 4 of the present invention. The information recording / reproducing apparatus 500 includes a disk motor 502, a preamplifier 508, a servo circuit 509, a binarization circuit 510, a modulation / demodulation circuit 511, an ECC circuit 512, a buffer 513, a CPU 514, an internal bus 534, An optical head portion 535. A multilayer information recording medium 50 is installed in the information recording / reproducing apparatus 500. The optical head portion 535 is
A lens 503, an actuator 504, a laser drive circuit 505, a photodetector 506, and a transfer table 507 are provided. Reference numeral 520 is a rotation detection signal, reference numeral 521 is a disk motor drive signal, reference numeral 522 is a laser emission permission signal, reference numeral 523 is a light detection signal, reference numeral 524 is a servo error signal, and reference numeral 525 is reference numeral 525. Is an actuator drive signal, reference numeral 526 is a carriage drive signal, reference numeral 527 is an analog data signal, reference numeral 528 is a binary data signal, reference numeral 529 is a demodulated data signal, and reference numeral 530 is a correction. Reference numeral 531 represents a stored data signal, reference numeral 532 represents an encoded data signal, and reference numeral 533 represents a modulated data signal.

  The CPU 514 functioning as a control unit controls the overall operation of the information recording / reproducing apparatus 500 via the internal bus 534 in accordance with a built-in control program. As will be described below, the optical head unit 535 can optically write information to the multilayer information recording medium 50 from one side of the multilayer information recording medium 50. Further, the optical head unit 535 can optically read information from the multilayer information recording medium 50. The CPU 514 uses the optical head unit 535 to control execution of defect management processing as described below.

  In response to the laser emission permission signal 522 output from the CPU 514, the laser light 536 is emitted from the laser driving circuit 505 to the multilayer information recording medium 50. The light reflected from the multilayer information recording medium 50 is converted into a light detection signal 523 by the photodetector 506. The photodetection signal 523 is added / subtracted by the preamplifier 508 to generate a servo error signal 524 and an analog data signal 527. Further, the analog data signal 527 is A / D (analog / digital) converted by the binarization circuit 510 to be converted into the binarization data signal 528, and the binarization data signal 528 is then demodulated by the modem circuit 511. Thus, a demodulated data signal 529 is generated. Next, the demodulated data signal 529 is converted into an error-free corrected data signal 530 by the ECC circuit 512, and the corrected data signal 530 is stored in the buffer 513. The servo circuit 509 outputs an actuator drive signal 525 to the actuator 504 based on the servo error signal 524, thereby feeding back the servo error to the actuator 504, and focusing control and tracking control of the lens 503 are executed. An error correction code is added to the stored data signal 531 which is the output of the data stored in the buffer 513 by the ECC circuit 512, and an encoded data signal 532 is generated. Next, the encoded data signal 532 is modulated by the modulation / demodulation circuit 511 to generate a modulated data signal 533. Further, the modulated data signal 533 is input to the laser driving circuit 505, and the power of the laser light is modulated.

  When the information recording / reproducing apparatus 500 is also used as a computer peripheral device such as a CD-ROM drive, a host interface circuit (not shown) is added and the host is connected via a host interface bus (not shown) such as SCSI. Data is exchanged between a computer (not shown) and the buffer 513. When used as a consumer device such as a CD player, an AV decoder / encoder circuit (not shown) for expanding or compressing compressed video and audio is added, and data is exchanged between the host computer and the buffer 513. .

  In the reproducing operation of the information recording / reproducing apparatus 500 according to the fourth embodiment of the present invention, defect management is performed in order to reproduce information recorded on the multilayer information recording medium 50 including two recording layers to which defect management is applied. Two processes, an information acquisition process and a sector reproduction process considering replacement, are required.

In the recording operation of the information recording / reproducing apparatus 500 according to Embodiment 4 of the present invention, the above-described reproducing operation is performed in order to record information on the multilayer information recording medium 50 having two recording layers to which defect management is applied. In addition, two processes, a defect management information update process and a sector recording process considering replacement, are required.

  FIG. 19 shows a flowchart 600 for explaining the defect management information acquisition procedure according to the fourth embodiment of the present invention. In this embodiment, it is assumed that the disc information area 10 storing disc information and the defect management area 12 storing defect management information are provided in the reference layer.

  In the first step 601 of the defect management information acquisition process, the CPU 514 instructs the servo circuit 509 to follow the focus of the laser beam on the track of the reference layer.

  In step 602, the optical head unit 535 reproduces the sector in which the disk information is stored, and the CPU 514 confirms the parameters and format necessary for recording / reproducing with respect to the multilayer information recording medium 50.

  In step 603, the optical head unit 535 reproduces the sector in which the defect management information is stored, and the reproduction data is held at a predetermined location in the buffer 513.

  FIG. 20 shows a flowchart 700 for explaining a sector reproduction procedure considering replacement in the fourth embodiment of the present invention. In this reproduction process, it is assumed that the defect management information including the DDS 20 and the DL 21 is already held in the buffer 513.

  In the first step 701 of the reproduction process, the CPU 514 converts the LSN to PSN (details will be described later with reference to FIG. 21).

  In step 702, the CPU 514 determines whether the recording layer on which the laser beam 536 is focused and the recording layer to be reproduced are the same by referring to the PSN layer number. If not, the process proceeds to step 703.

  In step 703, the CPU 514 instructs the servo circuit 509 to cause the focus of the laser beam 536 to follow the track of the recording layer to be reproduced.

  In step 704, the optical head unit 535 reproduces information recorded in the sector to which the PSN converted in step 701 is assigned.

  FIG. 21 shows a flowchart 800 for explaining the conversion procedure from LSN to PSN (ie, step 701 shown in FIG. 20) in the fourth embodiment of the present invention. In the present embodiment, the PSN increases by 1 every time the first recording layer advances from the inner periphery side to the outer periphery side, and in the second recording layer, the PSN increases by one sector from the outer periphery side to the inner periphery side. 1 increase.

  In the first step 801 of this conversion process, the LSN is converted to PSN without considering the replacement result of the defective sector and the spare area indicated by the DL 21 (that is, as in the case where there is no defective sector). Referring to FIG. 10, when the LSN to be converted is smaller than the total number of sectors in the first user data area 15, (minimum PSN of the first user data area 15) + (LSN) is calculated. By doing this, the PSN is obtained. When the LSN to be converted is larger than the total number of sectors in the first user data area 15, (the minimum PSN of the second user data area 16) + (LSN) − (the total of the first user data area 15 PSN is obtained by calculating the number of sectors.

In step 802, the CPU 514 refers to the DL entry 303 of the DL 21 to determine whether the sector assigned with the PSN obtained above has been replaced with a spare sector. If the sector has been replaced, the process proceeds to step 803, where the replacement is performed. If not, the conversion process ends.

  In step 803, the CPU 514 adopts the replacement sector position of the DL entry 303 indicating that the PSN has been replaced as the PSN.

  As described above, the information recording / reproducing apparatus 500 according to Embodiment 4 of the present invention can reproduce information recorded on the multilayer information recording medium 50 having two recording layers to which defect management is applied. it can. The user data playback operation after the focal point of the laser beam 536 moves to the recording layer to be accessed is basically the same as the user data playback operation using a single layer information recording medium. Obviously, any user data playback procedure of the recording and playback device can be used.

  FIG. 22 shows a flowchart for explaining the update procedure of defect management information according to the fourth embodiment of the present invention. In the present embodiment, the format processing of the multilayer information recording medium 50 includes defect management information initialization processing and spare area size expansion processing.

  In the first step 901 of the update process, the CPU 514 determines whether or not the necessary format process is a spare area size extension process. If the spare area size extension process, the process proceeds to step 902; Proceed to step 903.

  In step 902, the CPU 514 sets the value of the final spare area size 205 (FIG. 7) of the DDS 20 so as to become the designated spare size.

  In step 903, the CPU 514 sets each value of the DDS 20 to a predetermined value of the device, and sets the DL entry number 302 of the DL 21 to 0.

  In step 904, the CPU 514 determines whether or not the focal point of the laser beam 536 is following the track of the reference layer. If the focus is following the track of the reference layer, the process proceeds to step 906; Proceed to the process.

  In step 905, the CPU 514 instructs the servo circuit 509 to cause the focus of the laser beam 536 to follow the track of the reference layer.

  In step 906, the optical head unit 535 records the defect management information including the DDS 20 and the DL 21 in the sector included in the defect management area 12.

  FIG. 23 shows a flowchart 1000 for explaining a sector recording procedure in consideration of replacement in the fourth embodiment of the present invention.

  In the first step 1001 of the recording process, the CPU 514 converts the LSN to PSN according to the procedure shown in FIG.

  In step 1002, the CPU 514 refers to the PSN layer number to determine whether the recording layer on which the laser beam 536 is focused and the recording layer on which information is to be recorded are the same. Otherwise, the process proceeds to step 1003.

  In step 1003, the CPU 514 instructs the servo circuit 509 to cause the focus of the laser beam 536 to follow the track of the recording layer on which information is to be recorded.

  In step 1004, information is recorded in the sector to which the PSN converted in step 1001 is assigned.

  In step 1005, the CPU 514 controls the optical head unit 535 to reproduce the information recorded in the sector, thereby determining whether or not the information recording in the sector has succeeded (that is, the user data area 5 has a defective sector). If it is successful, the recording process is terminated; otherwise, the process proceeds to step 1006.

  In step 1006, the CPU 514 assigns the spare sector to the defective sector to replace the defective sector with the spare sector (details of spare sector assignment processing will be described later with reference to FIGS. 24A and 24B).

  In step 1007, if the process of replacing the defective sector with the spare sector is impossible, the recording process is terminated. If the process of replacing the defective sector with the spare sector is possible, the process returns to step 1001.

  FIG. 24A shows a flowchart 1100 for explaining spare sector allocation processing in Embodiment 4 of the present invention.

  Spare sector allocation processing includes processing for identifying at least one usable spare area among a plurality of spare areas included in the multilayer information recording medium 50, and the distance from the defective sector being the longest among the identified at least one spare area. Selecting a short spare area. Details of the spare sector allocation process will be described below with reference to FIG. 24A.

  In the first step 1101 of the spare sector allocation process, the CPU 514 refers to the spare depletion flag group 208 (FIG. 8) to determine whether there is an available spare area in the multilayer information recording medium 50. If there is no available spare, it is determined that the allocation process is impossible, and the allocation process is terminated. If there is an available spare area, the process proceeds to Step 1102.

  In step 1102, the CPU 514 determines whether the radius position of the defective sector is close to the spare area arranged on the inner peripheral side or the spare area arranged on the outer peripheral side. If the radius position of the defective sector is close to the spare area arranged on the inner circumference side, the process proceeds to step 1103. If the radial position is close to the spare area arranged on the outer circumference side, the process proceeds to step 1104.

  In step 1103, the CPU 514 refers to the spare depletion flag group 208 and determines whether or not the spare area arranged on the inner peripheral side is available. If the spare area arranged on the inner circumference side is available, the process proceeds to step 1105; otherwise, the process proceeds to step 1106.

  In step 1104, the CPU 514 refers to the spare depletion flag group 208 to determine whether the spare area arranged on the outer peripheral side is available. If the spare area arranged on the outer periphery side is available, the process proceeds to step 1106; otherwise, the process proceeds to step 1105.

  In step 1105, the CPU 514 refers to the spare depletion flag group 208 to determine whether or not a spare area arranged on the inner circumference side of the same recording layer as the recording layer in which the defective sector exists can be used. If it can be used, the process proceeds to step 1107; otherwise, the process proceeds to step 1108.

  In step 1106, the CPU 514 refers to the spare depletion flag group 208 to determine whether or not a spare area arranged on the outer periphery side of the same recording layer as the recording layer in which the defective sector exists can be used. If it can be used, the process proceeds to step 1109; otherwise, the process proceeds to step 1110.

  In step 1107, the CPU 514 assigns a spare sector included in the spare area arranged on the inner circumference side of the same recording layer as the recording layer in which the defective sector exists to the defective sector.

  In step 1108, the CPU 514 assigns a spare sector included in a spare area arranged on the inner circumference side of another recording layer to a defective sector.

  In step 1109, the CPU 514 assigns a spare sector included in the spare area arranged on the outer periphery side of the same recording layer as the recording layer in which the defective sector exists to the defective sector.

  In step 1110, the CPU 514 allocates a spare sector included in a spare area arranged on the outer peripheral side of another recording layer to a defective sector.

  In the spare sector assignment procedure shown in FIG. 24A, spare sectors included in a spare area whose radial distance is as close as possible from the sector position of the defective sector are used. Since the radial distance is short, the seek operation time in the radial direction accompanying the movement of the transfer table 507 can be shortened. As long as the object of using a spare sector included in a spare area whose radial distance is as close as possible from the sector position of the defective sector is achieved, a different allocation processing procedure may be used.

  FIG. 24B shows a flowchart 1120 for explaining another allocation process of spare sectors in the fourth embodiment of the present invention.

  This spare sector allocation process includes a process for identifying at least one usable spare area among a plurality of spare areas included in the multilayer information recording medium 50 and a defective sector that is a part of the user data area 5. The process of determining whether or not at least one of the specified at least one spare area is arranged in the recording layer in which the area is arranged, and the identification in the recording layer in which the area where the defective sector exists is arranged And a process of selecting a spare area having the shortest distance from the defective sector among the identified at least one spare area when it is determined that none of the at least one spare area is arranged. Details of the spare sector allocation processing will be described below with reference to FIG. 24B.

  In the first step 1121 of the spare sector allocation process, the CPU 514 refers to the spare depletion flag group 208 to determine whether there is a spare area available in the multilayer information recording medium 50. If there is no available spare area, it is determined that the allocation process is impossible and the allocation process is terminated. If there is an available spare, the process proceeds to step 1122.

  In step 1122, the CPU 514 refers to the spare depletion flag group 208 and determines whether or not a spare area arranged in the same recording layer as the recording layer in which the defective sector exists can be used. If it can be used, the process proceeds to step 1123; otherwise, the process proceeds to step 1124.

  In step 1123, the CPU 514 determines whether the radius position of the defective sector is close to the spare area arranged on the inner peripheral side or the spare area arranged on the outer peripheral side. If it is close to the spare area arranged on the inner peripheral side, the process proceeds to step 1125, and if it is close to the spare area arranged on the outer peripheral side, the process proceeds to step 1127.

  In step 1125, the CPU 514 refers to the spare depletion flag group 208 to determine whether or not a spare area arranged on the inner circumference side of the recording layer can be used. If it is available, the process proceeds to step 1129; otherwise, the process proceeds to step 1131.

  In step 1127, the CPU 514 refers to the spare depletion flag group 208 and determines whether the spare area arranged on the outer peripheral side of the recording layer can be used. If it is available, the process proceeds to step 1131; otherwise, the process proceeds to step 1129.

  The processing in steps 1124, 1126, and 1128 is the same as the processing in steps 1123, 1125, and 1127, except that the recording layer in which the spare area to be processed is arranged is different from the recording layer in which the defective sector exists. is there.

  In step 1129, the CPU 514 assigns a spare sector included in the spare area arranged on the inner circumference side of the same recording layer as the recording layer in which the defective sector exists to the defective sector.

  In step 1130, the CPU 514 allocates a spare sector included in a spare area arranged on the inner circumference side of a recording layer different from the recording layer in which the defective sector exists, to the defective sector.

  In step 1131, the CPU 514 assigns a spare sector included in a spare area arranged on the outer periphery side of the same recording layer as the recording layer in which the defective sector exists, to the defective sector.

  In step 1132, the CPU 514 assigns a spare sector included in a spare area arranged on the outer peripheral side of a recording layer different from the recording layer in which the defective sector exists, to the defective sector.

  In the spare sector allocation procedure shown in FIG. 24B, spare sectors included in a spare area arranged in the same recording layer as the recording layer in which a defective sector exists are used as much as possible. By using the spare sector included in the spare area arranged in the same recording layer, it is not necessary to change the setting of the recording parameter which is different for each recording layer. For example, when an optimum recording power is not adjusted for another recording layer during the recording operation of information on a certain recording layer, the allocation procedure shown in FIG. 24B is the allocation procedure shown in FIG. 24A. Faster than. If the purpose of using a spare sector included in a spare area arranged in the same recording layer as the recording layer in which a defective sector exists as much as possible is achieved, a different allocation procedure may be used.

  As described above, the information recording / reproducing apparatus 500 according to the fourth embodiment of the present invention can record information on the multilayer information recording medium 50 including two recording layers to which defect management is applied. The information recording / reproducing apparatus 500 can also allocate a spare sector from a spare area of a recording layer different from the recording layer in which the defective sector exists. In addition, the information recording / reproducing apparatus 500 executes the spare sector allocation process that places importance on shortening the seek time as described with reference to FIG. 24A, or the recording power setting time as described with reference to FIG. 24B. It is also possible to execute spare sector allocation processing that emphasizes shortening.

  Here, since the recording operation to the user data area after moving to the recording layer to be accessed is basically the same as that of a single layer information recording medium, any recording procedure of the information recording / reproducing apparatus corresponding to the single layer is used. It is clear that you can.

The recording operation in the user data area after the focal point of the laser beam 536 has moved to the recording layer to be accessed is basically the same as the recording operation in the user data area using a single layer information recording medium. It is obvious that the recording procedure for any user data area of the information recording / reproducing apparatus corresponding to the above can be used.

  In the fourth embodiment of the present invention, the multilayer information recording medium 50 described in the first embodiment is used. However, it is obvious that the multilayer information recording medium 60 described in the third embodiment can also be used. . It is obvious that the multilayer information recording medium 56 described in the second embodiment can also be used by applying the conversion process in step 801 shown in FIG. 21 to three or more recording layers.

  In the description of the present invention, a sector is used as a unit for reproduction / recording and defect management, but a block that is an aggregate of sectors, for example, an ECC block that is a unit for calculating an error correction code in a DVD disk It is obvious that the present invention can be applied even if it is replaced. Since a plurality of sectors included in the ECC block in which the defective sector exists is replaced with a plurality of spare sectors, the defective sector is also replaced with a spare sector in this case. Such modifications do not depart from the spirit and scope of the present invention, and modifications obvious to those skilled in the art are included in the claims of the present invention.

The figure which shows the structure of the track and sector of general optical disk The figure which shows the reproduction principle of the optical disk provided with two recording layers The figure which shows the groove pattern of the 2nd recording layer in the parallel path | pass of a DVD disc The figure which shows the groove pattern of the 1st recording layer in the parallel path | pass of a DVD disc The figure which shows the recording / reproducing direction of the disc in the parallel path of a DVD disc The figure which shows the allocation of the sector number in the parallel path | pass of a DVD disc The figure which shows the groove pattern of the 2nd recording layer in the opposite path | pass of a DVD disc The figure which shows the groove pattern of the 1st recording layer in the opposite path | pass of a DVD disc The figure which shows the recording / reproducing direction of the disc in the opposite path of a DVD disc The figure which shows allocation of the sector number in the opposite path | pass of a DVD disc The figure which shows the area | region layout of DVD-RAM The figure which shows the area | region layout of the multilayer information recording medium in Embodiment 1 of this invention The figure which shows the data structure of DDS20 in Embodiment 1 of this invention. The figure which shows the spare exhaustion flag group 208 in Embodiment 1 of this invention. The figure which shows the data structure of DL21 in Embodiment 1 of this invention The figure which shows the sector number allocation in Embodiment 1 of this invention The figure which shows the layout of the recording layer of the multilayer information recording medium which has one recording layer The figure which shows the layout of the recording layer of the multilayer information recording medium in Embodiment 2 of this invention The figure which shows the layout of the recording layer which shows the change aspect of the layout of the recording layer as described in FIG. 11B The figure which shows the area | region layout of the multilayer information recording medium in Embodiment 2 of this invention The figure which shows the data structure of DDS20 in Embodiment 2 of this invention. The figure which shows the spare exhaustion flag group 208 in Embodiment 2 of this invention. The figure which shows the sector number allocation in Embodiment 2 of this invention The figure which shows the area | region layout of the multilayer information recording medium in Embodiment 3 of this invention The figure which shows the sector number allocation in Embodiment 3 of this invention The figure which shows the information recording / reproducing apparatus 500 in Embodiment 4 of this invention. The flowchart explaining the acquisition procedure of the defect management information in Embodiment 4 of this invention Flowchart for explaining a sector reproduction procedure considering replacement in the fourth embodiment of the present invention The flowchart explaining the conversion procedure from LSN to PSN in Embodiment 4 of this invention The flowchart explaining the update procedure of the defect management information in Embodiment 4 of this invention Flowchart for explaining a sector recording procedure in consideration of replacement in Embodiment 4 of the present invention Flowchart explaining replacement sector allocation procedure in Embodiment 4 of the present invention The flowchart which shows the change aspect of the flowchart as described in FIG. 24A

Explanation of symbols

1 disk medium 2 track 3 sector 4 lead-in area 5 user data area 6 lead-out area 7 middle area 10 disk information area 11 OPC area 12 defect management area 13 spare area 20 disk definition structure (DDS)
21 Defect list (DL)
101 Lead-in area 102 Middle area 103 Middle area 104 Lead-out area 105 First spare area 106 Intermediate spare area 107 Final spare area 108 Intermediate spare area 109 Middle area 110 Lead-in area 111 Lead-out area 201 DDS identifier 202 LSN0 position value 203 First Spare area size 204 Intermediate spare area size 205 Final spare area size 206 First layer final LSN
207 Second layer final LSN
208 Spare depletion flag group 209 Number of recording layers 210 Intermediate spare size on inner circumference 211 Intermediate spare size on outer circumference 212 First layer user data area size 213 Middle layer user data area size 214 Final layer user data area size 301 DL identifier 302 DL entry number 303 DL entry 304 Defective sector position 305 Alternate sector position 306 Layer number 307 In-layer sector number 400 Substrate 401 Transparent resin 402 Total reflection recording layer 403 Translucent recording layer 404 Translucent recording layer 500 Information recording / reproducing apparatus 501 Optical disc 502 Disc motor 503 Lens 504 Actuator 505 Laser drive circuit 506 Photo detector 507 Transfer table 508 Preamplifier 509 Servo circuit 510 Binary circuit 511 Modulation / demodulation circuit 512 ECC Road 513 Buffer 514 CPU
520 Rotation detection signal 521 Disk motor drive signal 522 Laser light emission enable signal 523 Light detection signal 524 Servo error signal 525 Actuator drive signal 526 Transfer base drive signal 527 Analog data signal 528 Binary data signal 529 Demodulated data signal 530 Correction data signal 531 Stored data signal 532 Encoded data signal 533 Modulated data signal 534 Internal bus

Claims (4)

A multilayer information recording medium having a plurality of recording layers,
The multilayer information recording medium is
A user data area for recording user data;
A plurality of OPC areas optically recordable from one side of the multilayer information recording medium for adjusting the recording power of the laser beam,
Each of the plurality of recording layers includes a corresponding one of the plurality of OPC areas. An adjustment result storage area for storing an adjustment result of the recording power of the laser beam;
The multilayer information recording medium according to claim 1, wherein the adjustment result storage area is provided at least in a reference layer serving as a reference among the plurality of recording layers. The plurality of recording layers include a first recording layer and a second recording layer adjacent to each other,
The first recording layer is provided with a first user data area that is a part of the user data area,
The second recording layer is provided with a second user data area that is another part of the user data area,
A logical address is assigned to the first user data area in a direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the multilayer information recording medium.
2. The logical address is assigned to the second user data area in a direction from an outer peripheral side to an inner peripheral side of the multilayer information recording medium along a circumferential direction of the multilayer information recording medium. Multi-layer information recording medium. The plurality of recording layers include a first recording layer and a second recording layer adjacent to each other,
The first recording layer is provided with a first user data area that is a part of the user data area,
The second recording layer is provided with a second user data area that is another part of the user data area,
A logical address is assigned to the first user data area in a direction from the inner circumference side to the outer circumference side of the multilayer information recording medium along the circumferential direction of the multilayer information recording medium.
2. The logical address is assigned to the second user data area in a direction from an inner circumference side to an outer circumference side of the multilayer information recording medium along a circumferential direction of the multilayer information recording medium. Multi-layer information recording medium.

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