JP2009140591A - Multiple recording method of multilayer recording disk, multiple recording device for multilayer recording disk, and reproducing method of multiple-recorded multilayer recording disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To multiple-write AV data to be input in real time in a multilayer disk and a recording method. <P>SOLUTION: In the method of dividing data input from the outside in a multilayer recording disk in real time by predetermined amounts and recording the data as recording units in a main recording layer and a different position of a backup layer shifted by a predetermined amount from the main recording layer, a shifting amount is determined so as to satisfy "[time of the divided data input from the outside] ≥ [(time of recording the divided data in an innermost periphery of the main recording layer) + (access time from the innermost periphery to the different position of the backup layer) + (time of recording the divided data in the backup layer) + (access time from the recording end position of the backup layer to the recording end position of the main recording layer)]". <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-layer recording disk, for example, an optical disk, and more particularly to a method for increasing the reliability of recorded data by multiple recording on a multi-layer recording disk.

  When recording information on an optical disc having a rewritable or rewritable multi-layer structure, the user data is recorded using the first recording layer as the user data recording layer, the second recording layer is used as the copy area, and from the host computer. As a method for copying and backing up the user data of the first recording layer to the second recording layer when there is no access, the method of Patent Document 1 is known.

  When recording information on an optical disk having a multilayer structure, a method disclosed in Patent Document 2 is known as a method of writing data in different areas of a plurality of recording layers. Paragraph number 0079 describes that “the same data is recorded by shifting by a predetermined amount (for example, a half track)” in the second recording layer.

JP 2007-35102 A JP 2005-108280 A

  In optical disks, the reliability of data may be impaired due to external factors such as scratches and dust. On the other hand, error correction codes are added to recorded data to maintain reliability, but they cannot be corrected. Scratches and rubbish can be considered.

  In Patent Document 1, after user data is recorded on the first recording layer, the user data is copied to the second recording layer, which is an opposite track path, with respect to the first recording layer. The same data was overwritten, and the reliability against external factors such as scratches and dust was improved. However, Patent Document 1 is based on the premise that copying to the second recording layer is performed after recording to the first recording layer. For this reason, it takes time to complete recording on the second recording layer, and there is a problem that usability is not improved when applied to a device that requires real-time recording, such as an AV recorder or a camcorder. .

  Japanese Patent Laid-Open No. 2004-228561 describes shifting half a track as an example of shifting by a predetermined amount. In this method, for example, the shift amount at the innermost peripheral portion and the shift amount at the outermost peripheral portion vary greatly. When this method is applied to real-time recording, there is a problem that it is difficult to perform address control in accordance with the changing shift amount.

  An object of the present invention is to make it possible to record input data on a disc in real time while improving reliability against external factors such as scratches and dust.

  The above problems are solved by the invention described in the claims.

  According to the recording method of the present invention, it is possible to record input data on a disk in real time while improving reliability against external factors such as scratches and dust.

  An example of a multi-layer recording disk is an optical disk. Examples of the recording device include a device that records data on a disk recording medium such as a DVD recorder, a BD recorder, an HD-DVD recorder, and other camcorders.

  With reference to FIG. 1, a recording method for a multi-layer recording optical disk according to the first embodiment will be described by taking a four-layer recording optical disk as an example.

  FIG. 1 is a cross-sectional view of a multi-layer recording optical disc that can be recorded or reproduced from one side, with the right side being the inner peripheral side of the optical disc and the left side being the outer peripheral side of the optical disc. Laser light for recording or reproducing each layer of the optical disc is incident from above. Hereinafter, the layers are referred to as a first layer, a second layer, a third layer, and a fourth layer in order from the laser light incident surface. The first layer is a main recording layer for recording externally input data, and is a layer for mainly reproducing data from this layer during reproduction. The second layer is a backup layer that records the same data as the first layer, and at the time of reproduction, a portion that cannot be read due to an error in the main recording layer is a layer that reproduces data from this layer. The third layer is a main recording layer for recording input data from the outside, and is a layer for mainly reproducing data from this layer during reproduction. The fourth layer is a backup layer that records the same data as the third layer, and at the time of reproduction, a portion that cannot be read due to an error in the main recording layer is a layer that reproduces data from this layer.

  A case where video signals and audio signals digitized on such a disc are continuously input and recorded will be described with reference to FIG. Continuously input data is divided into sectors in units of a predetermined data amount, and a plurality of sectors are collectively recorded as a recording unit. Data of the first recording unit is recorded by the recording A of the first layer. Next, an interlayer jump is made to the second layer which is the backup layer of the first layer, and the pickup is moved by a predetermined sector address (access A1). Next, the same data as the recording A of the first layer is recorded in the recording A of the second layer. After the end of recording A, the layer jumps from the second layer to the first layer, and moves to the end position of recording A on the first layer (access A2). Next, data of the next recording unit is recorded in the record B from the end position of the first layer recording A. Next, an interlayer jump is made to the second layer which is the backup layer of the first layer, and the pickup is moved by a predetermined sector address (access B1). Next, the same data as the recording B of the first layer is recorded in the recording B of the second layer. After the end of recording B, the layer jumps from the second layer to the first layer and moves to the end position of recording B on the first layer (access B2).

  The same processing as the recording processing for the first layer and the second layer described above is continued toward the outer periphery as long as data is input. In this operation, the time required for recording A and B for each layer must be less than half of the time during which data in recording units is input.

Further, the shift amounts of the access A1 and the access B1 are set so that the access time T access A1, T access A2, T access B1, and T access B2 satisfy the expressions 1 and 2 in FIG. In Equation 1,
T input: time when recording unit data is input T recording A: time when recording unit data is recorded in the first layer or the second layer T access A1: recording A of the second layer after the recording A of the first layer is completed Time T access A2 to move to the start position: In time formula 2 to move to the record A end position of the first layer after the end of recording A of the second layer,
T input: time when recording unit data is input T recording B: time when recording unit data is recorded in the first layer or the second layer T access B1: recording B of the second layer after completion of recording B of the first layer Time to move to start position T access B2: Time to move to end position of recording B on the first layer after the end of recording B on the second layer.

  Further, the shift amounts of the access A2 and the access B2 are set so as to satisfy the expressions 1 and 2 in FIG. 1, for example, at the innermost circumference of the data recording area of the disc. For example, when shifting the recording position with a plurality of sectors as one unit on a CLV disc with a fixed relative recording speed and rotational speed, such as Blu-ray (registered trademark) Disc, HD DVD, and DVD The closer the recording position is to the innermost circumference, the greater the radial distance between the recording positions of the main recording layer and the backup layer. On the other hand, the closer to the outermost periphery, the smaller the radial distance. Therefore, by setting the shift amount in a range satisfying the expression in FIG. 1 in the innermost peripheral area, it is possible to perform recording up to the outermost periphery with the shift amount.

  The condition that satisfies Equation 1 will be described by taking Blu-ray (registered trademark) Disc as an example. When a BS digital stream is recorded on a Blu-ray Disc, the BS digital bit rate is 24 Mbps, and the user data recording rate at the standard speed of Blu-ray Disc is 36 Mbps. When 16 ECC clusters, which are Blu-ray Disc recording units, are used as recording units, the T input is represented by 16 * 64 * 1024 * 8 / (24 * 1024 * 1024) and is approximately 330 ms. When recording at double speed, the time for recording 16ECC clusters is 14.5ms * 16/2, which is 116ms. That is, the T record A is 116 ms. Therefore, the time available for T access A1 and T access A2 from Equation 1 is 330-116 * 2 and about 100 ms. Since the 16 clusters have about 5 tracks on the inner circumference side and the track pitch is 0.32 μm, the distance in the radial direction is 0.32 * 5 = 1.6 μm, so the distance between the access A1 and the access A2 is substantially the same. Therefore, access A1 and access A2 are 50 ms or less. Although it depends on the servo performance of the optical disk recording apparatus, the backup area of the second layer can be separated by a maximum of about 5 mm because the movement of 10 mm is generally about 100 ms. In this description, how far the backup area can be separated from the recording speed and access speed (servo performance) is derived based on Equation 1, but the distance to separate the backup area is determined in consideration of scratch resistance, and then the equation is calculated. 1 may determine the access speed and the recording double speed.

  Further, this description is merely an example. For example, values such as the drive access speed, the servo motor rotation speed, and the bit rate of data input from the outside may be changed, but satisfy the relations of Expressions 1 and 2 in FIG. Needless to say, it is within the scope of this embodiment as long as backup is written at different positions in different layers.

  Further, how much the shift amount is different is an item that can be arbitrarily set as long as Expression 1 and Expression 2 in FIG. 1 are satisfied. For example, in Expression 1 and Expression 2 in FIG. 1, the value on the right side may be 8/10 to 9/10 of the value on the left side, or may be in another range. In Expressions 1 and 2 in FIG. 1, the smaller the difference between the left side and the right side, the larger the shift amount between the main recording layer and the backup layer. In addition, the larger the shift amount, the greater the possibility that the difference between the recording start positions of the main recording layer and the backup layer will increase, and the possibility that the reliability with respect to external factors will improve.

  As described above, according to this embodiment, digitized video signals and audio signals input in real time can be continuously overwritten in the main recording layer and the backup layer, and at different positions in the main recording layer and the backup layer. Since the writing is performed, the reliability can be improved with respect to a failure such as a scratch or dust. The recording position of the backup data is in a range that can be made shorter than the input time of the recording unit data, which is the total recording time and access time of the two layers, so even if an error is found in the main recording layer during playback, the backup data can be backed up Since the data multiplexed in the layer can be quickly accessed, the output digitized video signal and audio signal can be output in real time without interruption.

  FIG. 1 illustrates an example in which the recording position of the shift backup layer is shifted to shift the recording position in the radial direction to improve the resistance to scratches and dust. By shifting, the recording start position in the backup layer may be moved in the circumferential direction of the disc.

  Further, by setting the shift amount to a predetermined number of sectors, it is possible to stably perform recording from the inner periphery to the outer periphery of the disc. In addition, since the shift amount is set with reference to the processing time in the innermost circumference, it is possible to suppress a shortage of processing time during recording.

  Next, with reference to FIG. 2, a recording method for a multilayer recording type optical disk according to the second embodiment will be described. FIG. 2 is a time chart showing an operation in which digital video signals and audio signals inputted in real time to a multilayer recording type optical disc capable of recording or reproduction from one side are continuously multiplexed and written on the main recording layer and the backup layer. It is. The time chart of FIG. 2 explains the operation of FIG. 1 in the time axis direction.

  In FIG. 2, the digitized video signal and audio signal are divided into inputs A200, B201, and C202 and input in predetermined units. While the input B 201 is being input following the input A 200, recording of the input A data to the first layer (recording A first layer 203) and after the recording A first layer 203 is completed, After access A1 (204), access A1 (204) moving to the recording position of the second layer, recording of input A data to the second layer (recording A second layer 205), and after the end of recording A second layer 205 Then, the recording A first layer 203 is moved to the end position, and access A2 (206) is performed. Thus, the data of the input A input in advance during the input of the input B is multiplexed and recorded on the first layer and the second layer. Similarly, while the input C201 is being input following the input B201, recording of the input B data to the first layer (recording B first layer 207), and after the recording B first layer 207 is completed, the backup layer After the access B1 (208) and access B1 (208) that move to the recording position of the second layer, the recording of the input B data to the second layer (recording B second layer 209), and the recording B second layer 209 After the recording is completed, the recording B first layer 207 is moved to the end position and the access B2 (210) is performed. Thus, the data of the input B input in advance during the input of the input C is multiplexed and recorded on the first layer and the second layer.

  Further, the shift amounts of the access A2 and the access B2 are set so as to satisfy the expressions 1 and 2 in FIG. 1, for example, at the innermost circumference of the data recording area of the disc.

  As described above, according to the present embodiment, when the input digitized video signal and audio signal are divided in predetermined units and continuously input in real time, the subsequent same amount of data is input. The same amount of data input in advance at different positions in the first layer and the second layer can be overwritten, and the reliability of the data can be increased.

  Next, with reference to FIG. 3, a recording method for a multi-layer recording type optical disk as the third embodiment will be described using a four-layer recording type optical disk as an example. FIG. 3 is a four-layer recording type optical disc having the same configuration as FIG. 1, wherein the first layer and the third layer are main recording layers, and the second layer and the fourth layer are the first layer and the third layer, respectively. Is the backup layer.

  A case where video signals and audio signals digitized on such a disc are continuously input and recorded will be described with reference to FIG. Continuously input data is divided into sectors in units of a predetermined data amount, and a plurality of sectors are collectively recorded as a recording unit. Data of the first recording unit is recorded by the recording A of the first layer. Next, an interlayer jump is made to the second layer which is the backup layer of the first layer, and the pickup is positioned at the same sector address at the substantially same position (access A1). Next, the same data as the recording A of the first layer is recorded in the recording A of the second layer. After the end of recording A, the layer jumps from the second layer to the first layer, and moves to the end position of recording A on the first layer (access A2). Next, data of the next recording unit is recorded in the record B from the end position of the first layer recording A. Next, an interlayer jump is made to the second layer, which is the backup layer of the first layer, and the pickup is positioned to the same sector address at substantially the same position (access B1). Next, the same data as the recording B of the first layer is recorded in the recording B of the second layer. After the end of recording B, the layer jumps from the second layer to the first layer and moves to the end position of recording B on the first layer (access B2). The same processing as the recording processing for the first layer and the second layer described above is continued toward the outer periphery as long as data is input.

  In this operation, the time required for recording A and B for each layer must be less than half of the time during which data in recording units is input. Further, the data amount of the recording unit is determined so that the access time T access A1, T access A2, T access B1, and T access B2 satisfy the expressions 1 and 2 as in the first embodiment.

  Further, the shift amounts of the access A2 and the access B2 are set so as to satisfy the formulas 1 and 2 in the figure at the innermost circumference of the data recording area of the disc, for example.

  As described above, according to the present embodiment, digitized video and audio signals inputted in real time can be continuously overwritten in the main recording layer and the backup layer, and the recording start position and the recording end of the main recording layer Since it is written at different positions in the position differential backup layer, it is possible to increase the reliability against failures such as scratches and dust. Since the recording end position of the main recording layer and the recording start position of the backup layer are substantially the same position, the access time is minimized, so the access control from the recording end position of the backup data to the recording end position of the main recording layer is controlled. However, the address shift amount of the backup layer can be increased.

  Next, with reference to FIG. 4, a recording method for a multi-layer recording type optical disk according to the fourth embodiment will be described using a four-layer recording type optical disk as an example. FIG. 4 shows an opposite track path four-layer recording type optical disc. In multi-layer discs, it is likely that the opposite track path will be mainstream because it is easy to record data continuously across multiple layers. In the opposite track path, when the adjacent track is used as a backup layer, the recording direction (from the inner periphery to the outer periphery or from the outer periphery to the inner periphery) is different. Therefore, if the address shift amount is kept constant, the physical distance approaches or moves away. Or For this reason, in order to physically separate a certain distance or more, it is necessary to increase the shift amount as compared with the parallel path of the first embodiment. Therefore, the recording direction of the main recording layer and that of the backup layer are matched by setting the backup layer of the first layer as the third layer and the backup layer of the second layer as the fourth layer. The recording operation in the case where the digitized video signal and audio signal are continuously input and recorded on such a disc is that the backup layer for the first layer in the first embodiment is changed to the third layer. Except for this, it is common to the first embodiment.

  Further, the shift amounts of the access A2 and the access B2 are set so as to satisfy the formulas 1 and 2 in the figure at the innermost circumference of the data recording area of the disc, for example.

  As described above, according to the present embodiment, digital video signals and audio signals that are input in real time are continuously continuously recorded even in an opposite-pass disc that is easy to record data continuously across a plurality of layers. Since multiple writing can be performed on the recording layer and the backup layer, and writing is performed at different positions in the main recording layer and the backup layer, the reliability can be increased against failures such as scratches and dust.

  Next, with reference to FIG. 5, a recording method for a multilayer recording type optical disk according to the fifth embodiment will be described. FIG. 5 is a flowchart showing an operation of continuously multiplex-writing digitized video signals and audio signals inputted in real time to a multi-layer recording type optical disc capable of recording or reproducing from one side to the main recording layer and the backup layer. is there. In this flowchart, the input processes 501 to 503 and the recording processes 504 to 511 are performed in parallel. Reference numeral 501 denotes a process of inputting the nth recording unit of the digitized video and audio signals divided by a predetermined amount. In step 503, the combination of 502 and 501 is performed until it is determined that the last data has been input. The data divided into fixed amounts is taken in sequentially. Reference numeral 504 denotes a process of recording the (n−1) th recording unit in the main recording layer while the nth recording unit is input at 501. Reference numeral 505 denotes a process of jumping to the backup layer after completion of 504. Reference numeral 506 denotes processing for accessing after shifting by a predetermined address after the end of 505. Reference numeral 507 denotes processing for recording the (n−1) th recording unit in the backup layer after the completion of 506. Reference numeral 508 denotes processing for determining whether the data recorded in 504 and 507 is final data. If the data is final data, the recording is terminated. If it is not the final data, an inter-layer jump from the backup layer to the main recording layer is performed at 509, and access to the recording end position at 504 is performed at 510. When the access is completed, data of the nth recording unit at 501 is input. Is already finished or is continuing (511). The fact that the input has already been completed indicates that the multiplex recording has not been completed during the input of a predetermined amount of data, so the abnormal process 513 is performed and the process ends. The fact that the input is still continuing means that multiple writing could be performed while a predetermined amount of data was being input. After waiting until the input of the nth recording unit 501 is completed in 512, the processing from 504 is performed. repeat.

  As described above, according to the present embodiment, digitized video signals and audio signals inputted in real time can be continuously multiplexed and written in the main recording layer and the backup layer. In addition, since it is determined whether multiple writing is performed in real time, multiple writing can be performed reliably.

  In the present embodiment, when the multiple recording of the (n-1) th recording unit does not end within the input time of the nth recording unit, the recording is ended. However, when the recording does not end within the input time, the backup recording of the recording unit is completed. It is also possible to stop recording and continue recording.

  Next, a multilayer recording type optical disk recording apparatus according to the sixth embodiment will be described with reference to FIG. FIG. 6 shows a block diagram of a multilayer recording type optical disk recording apparatus as an embodiment. In FIG. 6, reference numeral 604 denotes an interface circuit and 605 memory control circuit for inputting an externally digitized video signal and audio signal, and writes data input via the interface circuit to the cache memory 606 for each predetermined unit. . In parallel with the continued writing of the predetermined unit to the cache memory 606 via the interface circuit 604, the data is transferred in units of a predetermined amount to the encoder 1 and the backup layer that encode the data to be recorded in the main recording layer. It is sent to an encoder 2 that encodes data to be recorded.

  The selection circuit 609 selects the encoder 1 during the recording period in the main recording layer and selects the encoder 2 during the recording period in the backup layer. The selected recording data is recorded on the multilayer recording type optical disc 601 via the optical pickup 603. Reference numeral 602 denotes a disk motor that rotates the disk at the time of recording. The servo circuit 611 has a control a for causing the backup layer to jump between layers after data recording in the main recording layer is completed, and a predetermined amount of address after moving to the backup layer. Control b that is shifted by an amount of access, control c that causes the recording unit to jump to the main recording layer after data recording is completed in the backup layer, and movement to the main recording layer and then the recording end position of the main recording layer Perform control d. The predetermined amount of address shift is such that the sum of the recording time of the main recording layer and the backup layer and the operation time of the above a, b, c, d is shorter than the time required for inputting the data of the recording unit. Is set to be

  The abnormality determination circuit 610 monitors the memory control circuit 605 to grasp the timing at which the recording unit data is input, and also monitors the operation of the encoder 2 (608) and the servo control circuit 611 so that the recording unit data is obtained. During the input, it is determined whether or not the multiple recording has been completed. The CPU 612 controls each element of the recording apparatus such as 604 and 611, and performs the abnormality process as described in the fifth embodiment with the determination result of the abnormality determination circuit 610 as an input.

  As described above, according to this embodiment, it is possible to provide a recording apparatus capable of continuously multiplex-writing digitized video signals and audio signals input in real time on the main recording layer and the backup layer. In this embodiment, the encoder 1 and the encoder 2 are used for the main recording layer and the backup layer recording, respectively. However, if the processing time allows, the time division processing may be performed by one encoder.

  The recording apparatus of each of the above embodiments also performs recording on the backup layer every time data divided into a predetermined amount is recorded on the main recording layer. Thereby, for example, when the user performs an operation or the like to end the recording operation, the data before the last data recorded in the main recording layer is also recorded in the backup layer. For this reason, the recording apparatus according to the present embodiment can shorten the time from when the user performs an operation to end the recording operation to when the recording to the backup layer is completed.

Explanatory drawing which shows the recording method of a multilayer recording type optical disk. The time chart which shows the recording method of a multilayer recording type optical disk. Explanatory drawing which shows the recording method of a multilayer recording type optical disk. Explanatory drawing which shows the recording method of a multilayer recording type optical disk. The flowchart which shows the recording method of a multilayer recording type optical disk. The block diagram which shows the recording measure of a multilayer recording type optical disk.

Explanation of symbols

  601: Optical disk, 602: Disk motor, 603: Optical pickup, 604: Interface circuit, 605 ... Memory control circuit, 606 ... Cache memory, 607 ... Encoder 1, 608 ... Encoder 2, 610 ... Abnormality judgment circuit, 611 ... Servo control circuit

Claims (8)

A recording method for recording input data in real time with one layer of a multi-layer recording disc as a main recording layer and the other layer as a backup layer,
A first step of dividing the data and recording the divided data on the main recording layer;
A second step of recording the divided data on the backup layer at a different position shifted by a predetermined amount from a position for recording the divided data on the main recording layer,
The amount to be shifted by the predetermined amount is
Time when the divided data is input from the outside ≧ time for recording the divided data in the innermost circumference of the main recording layer + access time from the innermost circumference to a different position in the backup layer + the backup Time to record the divided data in the layer + access time from the recording end position of the backup layer to the recording end position of the main recording layer,
A recording method for a multi-layer recording type disc, characterized in that the amount satisfies the above requirement. A recording method in which one layer of a multi-layer recording disk having a parallel track path is a main recording layer and the other layer is a backup layer, and input data is divided into sectors and recorded in real time,
A first step of recording the main recording layer as data obtained by dividing a plurality of sectors;
A second step of recording the divided data on the backup layer at a position shifted by a predetermined address amount from a position where the divided data is written on the main recording layer,
The address amount is
Time when the divided data is input from the outside ≧ time for recording the divided data in the innermost circumference of the main recording layer + access time for shifting the predetermined address amount from the innermost circumference + the division into the backup layer Recording time of recorded data + access time from the recording end position of the backup layer to the recording end position of the main recording layer,
A recording method for a multi-layer recording type disc, characterized in that the amount satisfies the above requirement. A recording method for recording input data in real time with one layer of a multi-layer recording disk including an opposite track path as a main recording layer and the other layer as a backup layer,
A recording method for a multi-layer recording disk, wherein a layer having the same recording direction but not adjacent to the main recording layer is used as the backup layer, instead of an adjacent layer whose recording direction is opposite. In the recording method of the multilayer recording disk according to claim 3,
A first step of dividing the data and recording the divided data on the main recording layer;
A second step of recording the divided data on the backup layer at a position where the position where the divided data is recorded on the main recording layer is different from the position in the circumferential direction and / or the position in the radial direction; Including,
The position where recording is started in the second step,
Time when the divided data is input from the outside ≧ time for recording the divided data in the main recording layer + access time to a different position of the backup layer + time for recording the divided data in the backup layer + Access time from the recording end position of the backup layer to the recording end position of the main recording layer,
A recording method for a multi-layer recording type disc, characterized in that the position satisfies the above condition. A recording method for recording input data in real time with one layer of a multi-layer recording disc as a main recording layer and the other layer as a backup layer,
A first step of dividing the data and recording the divided data on the main recording layer;
Step 2 jumping from the main recording layer to the backup layer;
After the interlayer jump, accessing a different position shifted by a predetermined amount from a position for recording the divided data on the main recording layer; and
Step 4 of recording the unit data divided into the backup layer after the access step;
Step 5 for jumping from the backup layer to the main recording layer;
Step 6 for accessing the recording end position of the main recording layer;
Including
The amount to be shifted by the predetermined amount is
Time when data of the divided unit is input from the outside ≧ processing time for performing step 1 in the innermost circumference of the disk + processing time for performing step 2 in the innermost circumference + processing time for step 3 + processing time for step 4+ Processing time of step 5 + processing time of step 6;
A recording method for a multi-layer recording type disc, characterized in that the amount satisfies the above requirement. A recording method for recording input data in real time with one layer of a multi-layer recording disc as a main recording layer and the other layer as a backup layer,
Data input from outside is separated by time A,
Time A
A time for recording data input from the outside during the time A in the main recording layer;
A time for recording data input from the outside during the time A in the backup layer;
Time to access the recording position of the backup layer, which is a position different from the recording position of the main recording layer;
Time to access the recording end position of the main recording layer from the recording end position of the backup layer;
A method for recording a multi-layer recording type disc, wherein the recording method is divided into two. A recording apparatus that divides data inputted from the outside in predetermined units and records the data on a multilayer recording type disc at different positions in the main recording layer and the main recording layer of the backup layer,
Means for writing the predetermined amount of data to the main recording layer at a speed that is at least twice the speed at which the data is input from the outside;
Access means for accessing the multi-layer recordable disc;
Means for writing the predetermined amount of data to the backup layer at a speed that is at least twice the speed at which the data is input from the outside,
The access means includes a time when the predetermined amount of data is input from the outside ≧ time for recording the predetermined amount of data on the main recording layer + access time to a different position of the backup layer + the predetermined amount of data on the backup layer Of the multi-layer recording type disk, wherein the main recording layer and the backup layer are accessed so as to satisfy the following: time for recording the recording time + access time from the recording end position of the backup layer to the recording end position of the main recording layer Recording device. A method for reproducing a disc in which data inputted from outside is recorded on a multilayer recording type disc in real time at a position different from the main recording layer and the main recording layer of the backup layer,
When there is an uncorrectable error in the data of the main recording layer, the step of accessing a position different from the recording position of the main recording layer in the backup layer;
Replaying data multiplexed on the backup layer,
Time for outputting the predetermined amount of data to the outside ≧ Time for reproducing the predetermined amount of data in the innermost circumference of the main recording layer + in the backup layer to a different position corresponding to the reproduction start position in the main recording layer Access time + time for reproducing the predetermined amount of data recorded in the backup layer + access time from the reproduction end position of the backup layer to the reproduction end position of the main recording layer,
A reproducing method of a multi-recorded multi-layer recording disk characterized by satisfying the above.

Images