JP2005071468A - Information recording apparatus, information reproducing apparatus, information recording method, and information reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform recording which is simple and more reliable by using an information recording medium which has a plurality of recording layers. <P>SOLUTION: In an information recording apparatus capable of recording information to the information recording medium having a plurality of recording layers where information can be recorded, at least part of information D including Lead IN 20, LEAD Out 21, an anchor point 22, a file system (volume information) 23, and a data main body 24 is repeatedly recorded to the plurality of recording layers (Layer 0 and Layer 1) to repeatedly record at least part of recorded information to the plurality of recording layers (Layer 0 and Layer 1) without any user's special operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information recording apparatus, an information reproducing apparatus, an information recording method, and an information reproducing method.

  When recording information on a recording medium, the information is usually recorded once in one place, including information such as error correction information. When attempting to improve reliability and security when recording this information, the information should be recorded multiple times at multiple locations.

  For example, in data centers (data warehouses) that specialize in large-scale data storage, the same information is stored in completely different countries and regions to cope with unpredictable situations such as natural disasters and terrorism. There is a place.

  In addition, for example, there is a technology that enables recording at different locations even when data cannot be recorded at a certain recording location in recording information on a single information recording medium. . Such a technique is called defect management or replacement function.

  As a defect management and replacement function, for example, as a replacement process performed when a defect is detected in a disk-shaped recording medium having a plurality of recording layers, if a defect occurs in a certain recording layer, the area where the defect has occurred is determined. There is a technique in which a replacement area prepared in a different recording layer is replaced, and thereafter, access to an area in which a defect has occurred is automatically replaced with access to the replacement area (see, for example, Patent Document 1).

  In addition, for example, using a recording medium having a plurality of recording layers, there is a technique for performing recording on each recording layer by assigning the first half of the data to the first layer and the second half to the second layer. Yes (see, for example, Patent Document 2).

  However, in the technique described in Patent Document 2, the first half of the data is assigned to the first layer, and the latter half is assigned to the second layer, and the reliability is not particularly improved.

JP 2000-285607 A

JP 2001-126255 A

  Up to now, high reliability for exchangeable information recording media for mass consumption and ease of handling has been required much due to the widespread use of general-purpose computers capable of high-speed computation and advances in error correction technology. Not.

  For information recording media, low cost and high speed have been focused on rather than high reliability.

  However, in recent years, the Internet has become widespread as a means of communication, and it is becoming a major player in life. In addition, a digital information society in which an e-government with legal support is promoted is coming in earnest.

  Against this background, in recent years, high reliability has been required for information data handled at the individual level.

  Just as silver halide photographs and books have been able to retain information for a hundred years, for example, information recording media that holds information data handled at the individual level are more reliable than silver halide photographs and books have been realized. Sex is expected.

  An object of the present invention is to perform recording with high reliability while being simple using an information recording medium having a plurality of recording layers.

  An information recording apparatus according to claim 1 is an information recording apparatus capable of recording information on an information recording medium having a plurality of recording layers capable of recording information, wherein at least a part of the information to be recorded is a plurality of recording layers. Are provided with duplicate recording means for recording in duplicate.

  Accordingly, at least a part of the information to be recorded is recorded on the plurality of recording layers without any special operation of the user.

  According to a second aspect of the present invention, in the information recording apparatus according to the first aspect, the information to be recorded includes a data main body, and the duplicate recording means records at least a part of the data main body in a plurality of recording layers. To do.

  Therefore, the data body directly required by the user is recorded redundantly on a plurality of recording layers.

  According to a third aspect of the present invention, in the information recording apparatus according to the second aspect, the duplicate recording unit records the data body at a different position for each recording layer.

  Therefore, even when the information recording medium is physically damaged, the data body recorded at the damaged position can be reproduced.

  According to a fourth aspect of the present invention, in the information recording apparatus according to the first aspect, the information to be recorded includes a data body, and the duplication recording means duplicates management information or a management program of the data body in a plurality of recording layers. Record.

  Therefore, the management information or management program of the data body is recorded in duplicate on a plurality of recording layers.

  According to a fifth aspect of the present invention, in the information recording apparatus according to the fourth aspect, the duplicate recording means records the management information or management program of the data body at a different position for each recording layer.

  Therefore, even when the information recording medium is physically damaged, the management information or management program of the data body recorded at the damaged position can be reproduced.

  According to a sixth aspect of the present invention, there is provided an information reproducing apparatus which reproduces information recorded using the information recording apparatus according to any one of the first to fifth aspects, and is recorded on the one recording layer. Error detection means for detecting whether or not a failure has occurred in the reproduction of the information, and when a failure occurs in the reproduction of the information recorded in the one recording layer, the recording layer is different from the recording layer. Error recovery means for reproducing the recorded information.

  Therefore, even when a part of the information is damaged, this information can be reproduced without requiring a special operation by the user.

  According to a seventh aspect of the present invention, there is provided an information recording method according to the present invention, wherein at least one piece of information to be recorded is recorded when an information recording apparatus capable of recording information on an information recording medium having a plurality of recording layers capable of recording information is used. A duplicate recording step is performed in which a part is recorded in duplicate on a plurality of recording layers.

  Accordingly, at least a part of the information to be recorded is recorded on the plurality of recording layers without any special operation of the user.

  The invention according to claim 8 is the information recording method according to claim 7, wherein the information to be recorded includes a data body, and in the duplicate recording step, at least a part of the data body is recorded on a plurality of recording layers in an overlapping manner. To do.

  Therefore, the data body directly required by the user is recorded redundantly on a plurality of recording layers.

  According to a ninth aspect of the present invention, in the information recording method according to the eighth aspect, in the duplicate recording step, the data body is recorded at a different position for each recording layer.

  Therefore, even when the information recording medium is physically damaged, the data body recorded at the damaged position can be reproduced.

  According to a tenth aspect of the present invention, in the information recording method according to the seventh aspect, the information to be recorded includes a data body, and in the duplicate recording step, the management information or management program of the data body is duplicated in a plurality of recording layers. Record.

  Therefore, the management information or management program of the data body is recorded in duplicate on a plurality of recording layers.

  According to an eleventh aspect of the present invention, in the information recording method according to the tenth aspect, in the duplicate recording step, the management information or management program of the data body is recorded at a different position for each recording layer.

  Therefore, even when the information recording medium is physically damaged, the management information or management program of the data body recorded at the damaged position can be reproduced.

  The information reproducing method of the invention described in claim 12 is recorded on one recording layer when the information is reproduced using a recording / reproducing apparatus for reproducing information recorded on an information recording medium having a plurality of recording layers. An error detection step for detecting whether or not a failure has occurred in the reproduction of the information, and when a failure has occurred in the reproduction of the information recorded in one recording layer, the recording layer is different from the recording layer. And an error recovery step of reproducing the recorded information.

  Therefore, even when a part of the recorded information is damaged, this information can be reproduced without requiring any special operation by the user.

  According to the information recording apparatus of the first aspect of the present invention, since at least a part of the information to be recorded is recorded on the plurality of recording layers without any special operation of the user, the user is particularly conscious. Therefore, it is possible to record information with high reliability, and it is possible to perform recording with high reliability while being simple.

  According to the second aspect of the present invention, in the information recording apparatus according to the first aspect, the data body directly required by the user is recorded redundantly on the plurality of recording layers. Even if it is inferior, information can be retained for a long time without damaging the data body.

  According to the invention described in claim 3, in the information recording apparatus described in claim 1, even when the information recording medium is physically damaged, the data body recorded at the damaged position can be reproduced. It is possible to prevent a part of the data body from being lost.

  According to the fourth aspect of the present invention, in the information recording apparatus according to the first aspect, the management information or management program of the data body is recorded redundantly on a plurality of recording layers, so the environment of the information recording medium such as the storage state Even if it is inferior, the position of the target data body can be reliably identified over a long period of time.

  According to the fifth aspect of the invention, in the information recording apparatus according to the first aspect, even when the information recording medium is physically damaged, the management information or the management program of the data main body recorded at the damaged position is stored. Since it can be played back, it is possible to prevent the file system from being lost.

According to the information reproducing apparatus of the sixth aspect, when reproducing the information recorded using the information recording apparatus according to any one of the first to fifth aspects, for example, a part of the recording medium The information recording method according to claim 7, wherein the information can be reproduced without requiring a special operation by the user even when a part of the information is damaged due to damage. According to the above, since at least a part of the information to be recorded is recorded on the plurality of recording layers without any special operation of the user, information recording with high reliability can be performed without making the user specially conscious. Can be done.

  According to the eighth aspect of the invention, in the information recording method according to the seventh aspect, the data body directly required by the user is recorded redundantly on a plurality of recording layers. Even if it is inferior, information can be retained for a long time without damaging the data body.

  According to the ninth aspect of the invention, in the information recording method of the seventh aspect, even when the information recording medium is physically damaged, the data body recorded at the damaged position can be reproduced. It is possible to prevent a part of the data body from being lost.

  According to the invention described in claim 10, in the information recording method described in claim 7, since the management information or the management program of the data body is recorded redundantly on a plurality of recording layers, the environment of the information recording medium such as the storage state Even if it is inferior, the position of the target data body can be reliably identified over a long period of time.

  According to the eleventh aspect of the present invention, in the information recording method according to the seventh aspect, even when the information recording medium is physically damaged, the management information or management program of the data main body recorded at the damaged position is stored. Can be played.

  According to the information reproducing method of the twelfth aspect, even when a part of the recorded information is damaged, this information can be reproduced without requiring any special operation by the user. .

  A best mode for carrying out the present invention will be described with reference to FIGS. This embodiment shows an application example to an information recording apparatus and an information recording / reproducing apparatus as an information reproducing apparatus.

  FIG. 1 is a schematic diagram showing an information recording / reproducing apparatus according to an embodiment of the present invention. As shown in FIG. 1, an information recording / reproducing apparatus 1 includes a spindle motor 3 that rotates an optical disk 2 serving as an information recording medium, an optical pickup 4 that emits laser light applied to the optical disk 2, and an optical pickup 4 that is an optical disk. The coarse motor 5 is provided to move in the radial direction. Although the description is omitted because it is a known technique, the optical pickup 4 can perform a minute operation when the optical disk 2 is irradiated with laser light. The spindle motor 3 is driven and controlled by a rotation control system 6, the optical pickup 4 is driven and controlled by a pickup driving system 7, and the coarse motion motor 5 is driven and controlled by a coarse motion motor control system 8. The optical pickup 4 is driven and controlled by a signal processing system 11 in addition to the pickup driving system 7.

  Here, FIG. 2 is an explanatory diagram illustrating the optical disc 2 to be recorded and reproduced by the information recording / reproducing apparatus 1 of the present embodiment. The optical disk 2 is a disk-shaped disk and has a plurality of recording layers 2A. The recording layer 2A is provided in two or more layers on the same side (at least one of the front side and the back side) with respect to the substrate. The optical disc 2 has a plurality of recording layers provided in a laminated state on the cover layer 2B. A protective layer 2C is provided between the recording layers 2A so as to sandwich the recording layers.

  The recording layer 2A in the optical disc 2 of the present embodiment may be a write once type (write once: can be recorded only once) or a rewritable type (rewritable: can be recorded multiple times).

  In addition, the recording layer 2A in the optical disc 2 of the present embodiment may be divided into a plurality of fine layers having different physical characteristics in order to have a recording function.

  The information recording / reproducing apparatus 1 includes a controller and a CPU that drive and control the entire information recording / reproducing apparatus 1. In FIG. 1, the CPU / controller is shown, and hereinafter, the CPU / controller will be described with reference numeral 9. Although not particularly illustrated, the CPU / controller 9 includes a small amount of high-speed memory such as a register, and can perform buffer memory operations and digital signal processing, which are standard digital processing, at high speed.

  The CPU / controller 9 is connected to a nonvolatile memory 12 that retains various settings even when the power is turned off. In the nonvolatile memory 12 of the present embodiment, data that must be stored for a long time, such as the control program itself and control parameters for various media, are arranged. Information reproduction processing, which will be described later, is also implemented as a control program stored in the nonvolatile memory 12.

A buffer memory 13 is connected to the CPU / controller 9. The buffer memory 13 stores data transferred from the host computer H. The information recording / reproducing apparatus 1 includes an external interface 10 that communicates with an external device such as the host computer H. In general, an ATA / ATAPI interface is often used for personal computers, but SCSI, USB, IEEE 1394, IEEE 802, Serial ATA, or the like can also be used.

  Communication using the external interface 10 is performed by issuing a command data string (command) from the host and the CPU / controller 9 in the information recording / reproducing apparatus 1 responding to the issued command. Although not described because it is a well-known technique, the CPU / controller 9 performs a recording operation, changes a reproduction mode, specifies a recording layer for actual reproduction and recording, and the recording layer based on the issued command. The location and size of the recording layer can be specified.

  In such an optical disc 2, a focusing operation with the optical pickup 4 is required when operating on different recording layers 2 </ b> A. Therefore, as shown in FIG. 2C, the layer switching timing is clear even with a linear address instruction.

  When recording information on the optical disk 2, data transferred from the host computer H is temporarily stored in the buffer memory 13 via the external interface 10. The CPU / controller 9 performs signal processing based on the data stored in the buffer memory 13, irradiates the optical disc 2 with laser light from the optical pickup 4 via the pickup control system 7 and the signal processing system, and records information.

  When reading the data recorded on the optical disc 2, the data read from the optical disc 2 is stored in the buffer memory 13. Data stored in the buffer memory 13 is transferred to the host computer H via the CPU / controller 9 and the external interface 10.

  By the way, in such an optical disc 2, in order to apply a laser beam to the recording layer 2A located at a position far from the optical pickup 4 (close to the substrate), it passes through the recording layer 2A near the optical pickup 4. It will be. Note that the recording layer 2A through which the laser light passes is not always guaranteed whether it is unrecorded or recorded.

  For this reason, the signal quality is not constant in the case of recording or reproduction in the prior art, and is likely to vary. In addition, the optical disc 2 having a plurality of recording layers 2A as described above often has different recording characteristics and reproduction characteristics for each layer.

  Here, FIG. 3 is an explanatory diagram showing the structure of information in a standardly recorded single-layer information recording medium. The information recording medium 2 ′ recorded in consideration of compatibility basically includes a Lead In 20, a Lead Out 21, an anchor point 22 as recording / reproducing start instruction information, a file system (volume information) 23, and a data body 24. As described above, an information area for recording information D including five broadly is provided.

  Lead In20 is an area in which information indicating the start of the recording area is written. The Lead In 20 may be recorded with data necessary for controlling the compatibility of the optical disk 2, such as control data such as the type and format of the optical disk 2, and the like. Physical information may be recorded in Lead In20.

  The Lead Out 21 is an area in which information indicating the end of the recording area is written.

  The anchor point 22 is information that specifies a position that is always a starting point or a position when starting recording or reproduction when recording information D on the optical disk 2 or reproducing information D recorded on the optical disk 2. . At the anchor point 22, the position of the file system 23 is recorded.

  Since the anchor point 22 is a starting point for reproducing the information D recorded on the optical disc 2, it is impossible to record the anchor point 22 at an arbitrary place. Sometimes recorded.

  The file system 23 is used for recording on the optical disc 2 and is information related to other than the data main body 24. The information other than the data main body 24 and related thereto may be the information itself or may include information related to a program that directly uses this information. The file system 23 includes information such as the recording position, size, name, attribute, and time stamp of the data body 24, for example. The file system 23 describes files and directories based on these pieces of information. This provides information that can be viewed on a personal computer or the like. Information in the file system 23 may be referred to as metadata or FAT.

  The data body 24 is exactly the data to be recorded. Here, the data main body 24 is recorded in a continuous area, but the data main body 24 can also be recorded in a plurality of areas.

  The information recording / reproducing apparatus 1 of the present embodiment controls the arrangement of the recording information in the single-layer information recording medium 2 ′ described above with respect to the optical disc 2 by controlling the arrangement as shown below under the control of the CPU / controller 9. To record. Here, the duplicate recording means and the duplicate recording step are realized.

  FIG. 4 shows an optical disc 2 on which information D is recorded using the information recording / reproducing apparatus 1 of the present embodiment. In this example, information is recorded in exactly the same manner in the first recording layer (Layer 0) and the second recording layer (Layer 1). The recording method is the same as in the case of a single layer. After recording is performed on the first recording layer (Layer 0), the second recording layer (Layer 1) is focused by focus control. Recording on the first recording layer (Layer 1) may be performed, or after the recording on the first recording layer (Layer 0) is performed halfway, the first recording layer on the second recording layer (Layer 1) is recorded. You may repeat recording to the same place as the recording with respect to a recording layer (Layer 0).

  5 differs from the recording method shown in FIG. 4 in that the information recording positions are different for the first recording layer (Layer 0) and the second recording layer (Layer 1). It is a thing. As described above, the anchor point 23 that is the starting point for information reproduction cannot be moved, but the other information (file system 23, data bodies 24A, 24B, 24C) overlaps with the laser light during recording / reproduction. Do not place in.

  For example, when there is only a single file having a huge size that uses the entire area for recording the data body 24, the recording method as shown in FIG. 5 is not very effective, but in many cases the entire capacity is reached. On the other hand, since it is composed of a sufficiently small file, the position of the data body 24 recorded on the first recording layer (Layer 0) is different from the position of the data body 24 recorded on the second recording layer (Layer 1). It is effective to arrange.

  For example, in DVD-Video, the maximum file size is 1 GB, which is sufficiently small for the recording capacity of a DVD single layer.

  The recording method of the present embodiment is also effective in an information recording / reproducing apparatus having a plurality of information recording media fixedly provided therein, such as a hard disk.

  Here, FIG. 6 shows a plurality of information recording media on which information D is recorded by a conventional recording method in an information recording / reproducing apparatus having a plurality of information recording media fixedly provided therein, such as a hard disk. It is explanatory drawing which shows a part of information recording / reproducing apparatus which has inside. Since it is a well-known technique, description of the structure and method for magnetically recording and reproducing information on the hard disk is omitted. However, as shown in FIG. The recording medium 30 (30A, 30B, 30C) is fixedly provided. Each information recording medium 30A, 30B, 30C is rotatable about a shaft 31 provided at the center thereof.

  Each information recording medium 30A, 30B, 30C is provided with a concentric track, and a recording / reproducing head (not shown) is provided for each recording surface of each information recording medium 30A, 30B, 30C. A corresponding recording / reproducing head is used for recording and reproducing the recording information on each information recording medium 30A, 30B, 30C.

  In the conventional recording method, as shown in FIG. 6, different data A1, A2, and A3 are recorded on the outer tracks of the information recording media 30A, 30B, and 30C, respectively. Different data B1, B2, and B3 are recorded, and different data C1, C2, and C3 are recorded on the inner track.

  In contrast, the information recording / reproducing apparatus of the present embodiment records the recording information on the information recording media 30A, 30B, and 30C by the method shown in FIGS. 7 and 8 are explanatory diagrams showing a recording information recording method for the information recording media 30A, 30B, and 30C in the information recording / reproducing apparatus of the present embodiment. As shown in FIG. 7, in the information recording / reproducing apparatus of the present embodiment, data A1 is multiplexed and recorded in all recording layers. Similarly, data B1 and data C1 are recorded on all recording layers.

  By recording in this way, even when data cannot be reproduced on some of the information recording media 30A, 30B, or 30C, it can be reproduced from other information recording media 30A, 30B, or 30C. .

  In FIG. 8, the recording positions are different from each other. As a result, even when the recorded information recorded on a part of the information recording medium 30A, 30B, or 30C cannot be reproduced due to damage or the like, the data is recorded on the other information recording medium 30A, 30B, or 30C. The data recorded on the other information recording medium 30A, 30B or 30C can be reproduced.

  When recording is performed as shown in FIGS. 7 and 8, the total capacity that can be recorded is reduced as compared with the recording as shown in FIG. 6, but the reliability can be improved.

  In recent years, since the unit price per fixed disk capacity has also decreased, it is an effective method to record information as in this embodiment.

  Next, reproduction of recorded information recorded on the optical disc 2 or the information recording medium 30 will be described. In the present embodiment, a function as a reproducing means is realized here. FIG. 9 is a flowchart schematically showing the reproduction of the recorded information recorded on the optical disc 2 or the information recording medium 30. Here, it is assumed that the optical disc 2 (or the information recording medium 30) is already set, the type of the medium is recognized, and the anchor point 23 is also found. The start is when a playback command for the anchor point 23 that has been found is received. Hereinafter, the optical disc 2 will be described, but the same applies to the reproduction of the recorded information recorded on the information recording medium 30.

  As shown in FIG. 9, when a reproduction command for the anchor point 23 is received, the recording layer 2A, 2B or 2C to be reproduced is selected (step S1). Note that the recording layer 2A, 2B, or 2C selected here may be determined by default or may be given priority.

  Next, the target reproduction (start) address and size are obtained with reference to the file system 23 (step S2).

  The focal position of the optical pickup 4 is moved before the reproduction address (step S3), and signal reading is started from the reproduction address (step S4).

  In step S4, the data body 24 and the error correction data are extracted from the reproduction signal reproduced for the specified size (step S5).

  Then, error detection and correction processing are performed based on the extracted data body 24 and the error correction data, and it is determined whether there is an error that cannot be corrected by the correction processing at this time (step S6). Here, an error detection means and an error detection step are realized.

  If there is an error that cannot be corrected even by the correction process (Y in step 6), it is determined whether or not to reproduce the information D recorded in the other recording layer 2A, 2B, or 2C (step S7). The determination in step S9 may be appropriately set according to the reliability accuracy of the read data.

  If it is determined that the recorded information recorded in the other recording layer 2A, 2B or 2C is to be reproduced (Y in step S9), the process proceeds to step S1. Here, in step S7, the error recovery means and the error recovery step are realized by the processing after determining that the information D recorded in the other recording layer 2A, 2B or 2C is to be reproduced.

  When it is determined not to reproduce the recorded information recorded on the other recording layers 2A, 2B, or 2C (N in step S7), a predetermined error process is performed (step S8). Note that the error processing performed in step S8 is a known technique, and thus description thereof is omitted.

  On the other hand, if there is no error that cannot be corrected even by the correction process in step S6, that is, if the error is corrected by error correction (N in step 6), a process of transferring the reproduced data body 24 to the host computer H is performed. finish.

  Although not shown in the drawing, as in the case described above, the other recording layer 2A can be used even when the reproduction address cannot be read, the optical pickup 4 cannot move, or the reproduction signal cannot be obtained. , 2B or 2C, and the same processing can be performed.

  As described above, according to the information recording / reproducing apparatus 1 of the present embodiment, at least a part of the recording information is recorded on the plurality of recording layers 2A, 2B or 2C without any special operation of the user. Therefore, it is possible to perform highly reliable information recording without making the user particularly conscious.

  In addition, according to the information recording / reproducing apparatus 1 of the present embodiment, the data body 24 directly required by the user is recorded on a plurality of recording layers, so that the environment of the information recording medium such as the storage state is poor. Even in such a case, the recorded information can be held for a long time without damaging the data body 24.

  Furthermore, according to the information recording / reproducing apparatus 1 of the present embodiment, even when the optical disc 2 (or the information recording medium 30) is physically damaged, the data body 24 recorded at the damaged position is reproduced. Therefore, it is possible to prevent a part of the data body 24 from being lost.

  In addition, according to the information recording / reproducing apparatus 1 of the present embodiment, the file system 23 for storing the meta information is recorded on the plurality of recording layers 2A, 2B, and 2C, so that the storage state etc. Or even if the environment of the information recording medium 30) is poor, the position of the target data body 24 can be reliably specified over a long period of time.

  Further, according to the information recording / reproducing apparatus 1 of the present embodiment, even when the optical disc 2 (or the information recording medium 30) is physically damaged, the file system recorded at the damaged position can be reproduced. As a result, it is possible to prevent the file system 23 from being lost.

  According to the information recording / reproducing apparatus 1 of the present embodiment, as described above, a part of the optical disc 2 is damaged by recording the information D on the plurality of recording layers 2A, 2B, 2C. Even in this case, the information D recorded on the optical disc 2 can be reproduced without requiring any special operation by the user.

  As described above, according to the information recording / reproducing apparatus 1 of the present embodiment, the reliability of the recorded information is improved and the recorded information D is reliably held for a long time without any special operation by the user. In addition, even if the optical disk is partially damaged, it is possible to prevent the loss of the information D recorded on the optical disk 2 (or the information recording medium 30).

1 is a schematic diagram showing an information recording / reproducing apparatus according to an embodiment of the present invention. It is explanatory drawing which illustrates the optical disk which the information recording / reproducing apparatus of this Embodiment makes the object of recording / reproducing. It is explanatory drawing which shows the structure of the recording information in the single-layered information recording medium recorded normally. This is an optical disc 2 on which information is recorded using the information recording / reproducing apparatus of the present embodiment. FIG. 5 is an explanatory diagram showing a state in which information is recorded by arranging the information recording positions differently in the first recording layer and the second recording layer in the recording method shown in FIG. 4. It is explanatory drawing which shows a part of information recording / reproducing apparatus which has a some information recording medium in which recording information was recorded by the conventional recording method inside. It is explanatory drawing which shows the recording method of the recording information with respect to the information recording medium in the information recording / reproducing apparatus of this Embodiment. It is explanatory drawing which shows another recording method of the recording information with respect to the information recording medium in the information recording / reproducing apparatus of this Embodiment. 4 is a flowchart schematically showing reproduction of information recorded on an optical disc or an information recording medium.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information recording device, information reproducing device 2 Information recording medium 20 Lead In
21 Lead Out
22 Recording / reproduction start point instruction information 23 File system 24 Data body 30 Information recording medium D Recording information

Claims (12)

In an information recording apparatus capable of recording information on an information recording medium having a plurality of recording layers capable of recording information,
An information recording apparatus comprising: an overlapping recording unit that records at least a part of information to be recorded on a plurality of recording layers. The information to be recorded includes a data body,
The information recording apparatus according to claim 1, wherein the duplicate recording unit records at least a part of the data body in a plurality of recording layers in an overlapping manner.   3. The information recording apparatus according to claim 2, wherein the duplicate recording unit records the data body at a different position for each recording layer. The information to be recorded includes a data body,
2. The information recording apparatus according to claim 1, wherein the duplicate recording means records the management information or management program of the data body in a plurality of recording layers in a duplicated manner.   5. The information recording apparatus according to claim 4, wherein the duplicate recording unit records management information or a management program of the data body at a different position for each recording layer. Reproducing means for reproducing information recorded using the information recording apparatus according to any one of claims 1 to 5,
Error detection means for detecting whether or not a failure has occurred in reproduction of the information recorded in the one recording layer;
Error recovery means for reproducing information recorded on the recording layer different from the recording layer when a failure occurs in reproducing the information recorded on the one recording layer;
An information reproducing apparatus comprising: When recording information using an information recording apparatus capable of recording information on an information recording medium having a plurality of recording layers capable of recording information, at least a part of the information to be recorded is recorded on the plurality of recording layers. An information recording method for executing a duplicate recording step.   The information recording method according to claim 7, wherein the information to be recorded includes a data body, and in the duplication recording step, at least a part of the data body is duplicated and recorded on a plurality of recording layers.   9. The information recording method according to claim 8, wherein in the duplication recording step, the data body is recorded at a different position for each recording layer.   8. The information recording method according to claim 7, wherein the information to be recorded includes a data body, and in the duplicate recording step, the management information or management program of the data body is recorded in duplicate in a plurality of recording layers.   11. The information recording method according to claim 10, wherein in the duplicate recording step, management information or a management program of the data body is recorded at a different position for each recording layer. When reproducing the information using a recording / reproducing apparatus that reproduces information recorded on an information recording medium having a plurality of recording layers,
An error detection step of detecting whether or not a failure has occurred in the reproduction of the information recorded in the one recording layer;
An error return step of reproducing information recorded on the recording layer different from the recording layer when a failure occurs in reproducing the information recorded on the one recording layer;
Information reproduction method to execute.

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