JP5756673B2 - Recording / playback device - Google Patents

Description

  The present invention relates to a recording / reproducing apparatus, and more particularly to a recording / reproducing apparatus having a constant data transfer rate.

  In a recording / reproducing apparatus using an optical disk as a recording medium, an apparatus having a plurality of recording drives called RAID (Redundant Arrays of Inexpensive Discs) has been widespread in order to process a large amount of data in a short time. RAID has a feature that a large amount of data can be easily processed because a plurality of recording drives are viewed from other components as if they were one recording drive. In RAID, when data is recorded on a recording medium by a plurality of recording drives, development for efficiently transferring the data is in progress.

  In Patent Document 1, half of the drives are written from the outer periphery to the inner periphery of the optical disc, and the other half of the drives are written from the inner periphery to the outer periphery of the optical disc. A technique for making the data transfer rate constant by changing the amount of data on the inner circumference side is disclosed.

JP-A-10 (1998) -320134

  Since an optical disk has a recording track for recording data formed in a spiral shape, it is necessary to record data in a predetermined direction, for example, from the inner circumference side to the outer circumference side. For this reason, in Patent Document 1, the operation relating to the optical disk written from the outer periphery toward the inner periphery is performed as follows. First, a first recording stripe having a predetermined capacity is recorded from the inner circumference side toward the outer circumference side. Next, a seek operation is performed to move the optical pickup to the inner circumference side of the optical disc in accordance with the total capacity of the first recording stripe and the second recording stripe to be recorded next. Subsequently, the second recording stripe is recorded from the inner peripheral side toward the outer peripheral side. However, frequent seek operations cause a decrease in data transfer rate.

Recently, the recording layer of optical discs has been increasing in number. For example, in a BD (Blu-ray Disc), a four-layer disc has been generalized, and a disc having a larger number of recording layers is expected in the future. In Patent Document 1, no consideration is given to the case of using a multilayer optical disk.
In view of the above situation, an object of the present invention is to provide a recording / reproducing apparatus having a constant data transfer rate.

In order to solve the above problems, the present invention is a recording / reproducing apparatus for recording and reproducing a recording stripe including information data on a multilayer optical disk having a plurality of recording layers,
A plurality of optical disk drives for recording and reproducing information data on the mounted multilayer optical disk, and a control unit for controlling the operation of the plurality of optical disk drives,
The recording stripe to be recorded is divided and supplied to the plurality of optical disk drives,
Supplying the optical disc drive with a logical address at the time of recording so as to record the divided recording stripes on the optical discs mounted on the plurality of optical disc drives at positions having different transfer speeds;
When the recording stripe is divided, the recording amount is divided so that the transfer times of the divided recording stripes in the plurality of optical disk drives are substantially equal.

The present invention is also a recording / reproducing apparatus for recording and reproducing a recording stripe including information data on a multilayer optical disc having a plurality of recording layers,
An even number of optical disk drives that record and reproduce information data on the mounted multi-layer optical disk, and a control unit that controls the operation of the even number of optical disk drives,
The recording stripe to be recorded is divided and supplied to the even number of optical disk drives,
The divided recording stripe is divided into the half of the even number of optical disk drives in the optical disk drive and the half of the even number of optical disk drives in the remaining optical disk drive. To record at a position where the transfer speed is different from each other, a logical address at the time of recording is determined and supplied to the optical disc drive,
When the recording stripes are divided, the data stripes are divided so that the transfer times of the divided recording stripes in the even number of optical disc drives are substantially equal.

  According to the present invention, it is possible to provide a recording / reproducing apparatus having a constant data transfer speed, and there is an effect that it is possible to contribute to improvement of the basic performance of the recording / reproducing apparatus.

It is a block diagram of the recording / reproducing apparatus in one Example. It is a figure which shows the correspondence of the address and recording data in one Example. FIG. 3 is a transition diagram illustrating a change in recording position on the recording medium in FIG. 2. It is a figure which shows the correspondence of the address and recording data in one Example using the recording medium of an even layer. FIG. 5 is a transition diagram illustrating a change in recording position on the recording medium in FIG. 4. It is a figure which shows the correspondence of the address and recording data in one Example using the recording medium of an odd layer. It is a transition diagram which shows the change of the recording position on the recording medium in FIG. FIG. 7 is a transition diagram showing a change in recording position in a specific recording layer in FIG. 6.

In the embodiment of the present invention, as will be described below, the recording / reproducing apparatus uses a multi-layer recording medium having a plurality of recording layers to assign a unique logical address so as to have a substantially constant transfer speed. Yes. In addition, the number of occurrences of seek operations is reduced.
As a result, the problem that the transfer speed fluctuates according to the position on the recording medium and the seek operation is solved, and the processing time for recording and reproducing data can be easily predicted. Further, the recording drive can cope with the required processing time at a lower processing speed than before, and the effect of reducing the price of the recording / reproducing apparatus can also be expected.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention. First, the operation of the recording / reproducing apparatus will be described with reference to FIG.
A LAN (Local Access Network) unit 101 is an interface with a local network (not shown), and transmits information data from a recording / playback apparatus to an external apparatus, and receives information data transmitted from an external apparatus. The memory 102 is a semiconductor memory including a nonvolatile flash memory, for example. Of course, a volatile RAM (Random Access Memory) or a read-only ROM (Read Only Memory) may be included.

The controller 103 has a CPU (Central Processing Unit) for controlling the operation of the entire recording / reproducing apparatus. An HDD (Hard Disk Drive) 104 is a magnetic disk drive and stores, for example, software, firmware, or information data for the control unit 103 to control the operation of the recording / reproducing apparatus. An embodiment in which not only the HDD 104 but also a part or all of the software and firmware is stored in, for example, the ROM of the memory 102 is also conceivable.
The IF unit 105 is an interface to ODDs (Optical Disc Drives) 108 and 109, and the IF unit 106 is an interface to ODDs 110, 111, 112, and 113. These may be interfaces based on a data storage standard standardized as, for example, SATA (Serial Advanced Technology Attachment).

  The two ODDs formed by the ODD 108 and the ODD 109 form one RAID, and the control unit 103 can control as if only one ODD. Similarly, four ODDs of ODDs 110, 111, 112, and 113 form one RAID, and can be controlled from the control unit 103 as if only one ODD. Each ODD records or reproduces information data on the inserted optical disk in accordance with a command from the control unit 103.

An example of operation as a recording / reproducing apparatus will be described. An instruction from the control unit 103 is supplied to each component of the recording / reproducing apparatus via a bus indicated by a connection line in the drawing.
The control unit 103 instructs the LAN unit 101 to receive information data desired by the user from an external device. The received information data is temporarily stored in the memory 102 in response to an instruction from the control unit 103. The data stored in the memory 102 is stored in the HDD 104 in units of data blocks having a predetermined capacity in accordance with an instruction from the control unit 103. Of the information data stored in the HDD 104, information data that is desired to be stored in an easily portable optical disk medium also forms a RAID from the HDD 104 via the IF unit 105 in response to an instruction from the control unit 103. It is transferred to ODD 108 and 109 and stored. Alternatively, the data is transferred from the HDD 104 to the ODDs 110, 111, 112, and 113 that form the RAID via the IF unit 106 and stored.

When the user desires to reproduce the information data stored in the HDD 109 or the ODD 108 to 113 and transmit it to an external device, the information data reproduced from the ODD 108 to 113 in accordance with an instruction from the control unit 103 is The data is transmitted from the LAN unit 101 to an external device while being temporarily stored in the memory 102 in units of data blocks having a capacity of.
An accessor 114 is connected to the control unit 103 via the IF unit 107. The accessor 114 is an optical disk transport device, which takes out a specified optical disk from a library (not shown) of the optical disk in accordance with an instruction from the control unit 103, transports it, and mounts it on the specified ODD. Alternatively, the optical disk is taken out from the designated ODD, conveyed, and stored in the optical disk library.

The embodiment of the present invention is not limited to the block diagram of FIG. For example, an interface with an external device is not limited to a LAN. It may be an interface with a general telephone line, or a standardized interface such as IEEE 1394 or HDMI (High Definition Multimedia Interface). There may be a configuration in which the HDD 104 is not present and information data is directly recorded in the ODDs 108 to 113 via the memory 102.
The number of IF sections for ODD is not limited to two, 105 and 106. There may be any one or more IF units. Although the case where there are two ODDs (ODD 108 and 109) and four cases (ODDs 110 to 113) constituting a RAID connected to one IF unit is shown, any number of ODDs may be used. In the following, a case where four ODDs 110 to 113 forming one RAID are connected to one IF unit 106 as a representative.
The IF unit 107 and the accessor 114 may not be present, and an apparatus for manually exchanging the optical disk may be used. The ODDs 108 to 113 may be incorporated in the recording / reproducing apparatus, or may be attached externally.

Next, the operation of recording and reproducing information data for one RAID having four ODDs 110 to 113 in this embodiment will be described in more detail. As described above, the present embodiment is characterized by the recording / reproducing method when a multi-layer optical disc having a plurality of recording layers is inserted into the ODDs 110 to 113.
The recording layers of the multilayer optical disc are called L0 layer, L1 layer, and L2 layer in order from the recording layer far from the optical pickup. In a four-layer optical disk, there are up to L3 layers. In the L0 layer and the L2 layer, spiral recording tracks are provided so that information data is recorded from the inside to the outside. Conversely, in the L1 layer and the L3 layer, spiral recording tracks are provided so that information data is recorded from the outside toward the inside.

In this embodiment, when recording the information data, the control unit 103 changes the position of the logical address assigned to each optical disc or each recording layer, and changes the striping size of the data to be recorded, thereby changing each ODD. The time required for recording in is made substantially constant. Thus, one characteristic is that the data transfer rate is substantially constant.
FIG. 2 is a diagram illustrating an example of a correspondence relationship between addresses on the optical disc and blocks of recording data. Here, an example in which each of the ODDs 110 to 113 starts recording from the L0 layer will be described as the most easily understood example of the present embodiment. Of course, the same applies to the case where each of the ODDs 110 to 113 starts recording from the L1 layer or the L2 layer.

As shown at the left end of FIG. 2, in the L0 layer, physical addresses are assigned in order from 0 toward the outermost periphery of the data recording area. When performing CAV (Constant Angular Velocity) control, as indicated by the vertical axis of the graph in the figure, the linear velocity differs depending on the physical address, and the difference between the inner and outer circumferences is about N times (for example, 3 times) There is. For this reason, the following processing is performed on a data block obtained by roughly dividing a recording stripe, which is one unit of data to be recorded on an optical disc. Here, a case where one recording stripe is divided into 15 data blocks will be described.
Among the plurality of ODDs 110 to 113 constituting the RAID, for example, in the ODD 110, one data block (data block 0 in the figure) is recorded in the innermost circumference (physical address 0 and logical address 0). In the ODD 111, two data blocks (data blocks 1 and 2) are recorded at positions slightly closer to the outer periphery (physical addresses 1 and 2, and logical addresses 0 and 1). In the ODD 112, four data blocks (data blocks 3 to 6) are recorded at positions closer to the outer periphery (physical addresses 3 to 6 and logical addresses 0 to 3). In the ODD 113, eight data blocks (data blocks 7 to 14) are recorded at positions (physical addresses 7 to 14 and logical addresses 0 to 7) closer to the outer periphery.

Next, the ODD 110 records two data blocks (data blocks 15 and 16 in the figure) at physical addresses 1 and 2 (logical addresses 1 and 2). In the ODD 111, four data blocks (data blocks 17 to 20) are recorded at physical addresses 3 to 6 (logical addresses 2 to 5). In the ODD 112, 8 data blocks (data blocks 21 to 28) are recorded in physical addresses 7 to 14 (logical addresses 4 to 11). In the ODD 113, one data block (data block 29) is recorded at a physical address 0 (logical address 8).
Similarly, when the data to be recorded continues, the recording is continued until the capacity of the L0 layer is full in all the optical discs. In the case of FIG. Similar recording is performed.

At this time, 15 data blocks of data are stored in the memory 102 and then recorded on the optical disc in parallel by the four ODDs 110 to 113. As described above, the address range is determined according to each optical disc so that the data amounts at the respective addresses on the optical disc substantially coincide.
By assigning a large amount of data to the ODD that records data on the outer circumference side where the linear velocity is high among the ODDs constituting the RAID, the processing time in each ODD can be made substantially equal. In other words, when recording one recording stripe, different numbers of divided data blocks are allocated to a plurality of ODDs. A logical address corresponding to the number of data blocks is assigned to each ODD. By defining the correspondence relationship between the logical address and the physical address so that the sum of the transfer times at the logical address is substantially constant in each ODD, the processing time in each ODD can be made substantially equal.

In the embodiment of FIG. 2, unlike the patent document 1, the seek operation is not repeated frequently, so that the processing speed can be improved.
In order to make the explanation easy to understand in FIG. 2, one physical address has a transfer rate of 1 × speed (R in the figure), and 2 physical addresses have a double speed (R * 2 in the figure). The description has been given assuming that four physical addresses are 4 times faster (R * 4 in the figure) and 8 physical addresses are 8 times faster (R * 8 in the figure). Actually, the physical address of any double speed value is the above-mentioned integer (M) times, and the positional relationship on the optical disk is conceptually shown by the hatched portion of the graph in the figure.

More specifically, a process of recording one data block in the ODD 110, two data in the ODD 111, four data in the ODD 112, and eight data blocks in the ODD 113 is performed M times. Thereafter, a process of recording two data blocks in the ODD 110, four in the ODD 111, eight in the ODD 112, and one data block in the ODD 113 is performed M times. Furthermore, after performing M times the process of recording 4 data blocks in ODD110, 8 in ODD111, 1 in ODD112, and 2 in ODD113, 8 in ODD110, 1 in ODD111, and 2 in ODD112 The process of recording four data blocks in the ODD 113 is performed M times.
That is, the physical addresses are actually separated from each other between physical addresses 0 and 1, 2 and 3, and 6 and 7 in FIG. There are similar circumstances in the embodiments shown in FIGS. 4 and 6 below.

In the embodiment of FIG. 2, the transfer speed is 1 to 8 times speed and 15 data blocks are processed. However, this is not a limiting condition. Any embodiment may be used as long as the number of data blocks is determined according to the transfer speed at the recording position on the recording medium, the number of logical addresses is determined according to the number of data blocks, and the transfer time in each ODD is substantially constant.
FIG. 3 is a transition diagram showing changes in the recording position on the recording medium in FIG. The recording start position in each ODD is as shown in FIG. 2, and thereafter, recording is continued toward the outer peripheral side as indicated by an arrow (solid line) in the figure. After reaching the outermost circumference, recording is continued from the outer circumference side to the inner circumference side of the L1 layer in the ODD 110, and in the ODDs 111 to 113, the optical pickup is in the seek operation most as shown by an arrow (broken line) in the figure. The recording returns to the inner periphery, and recording continues toward the outer periphery again.

Next, in a RAID composed of, for example, four ODDs, unlike the above-described example, for two ODDs, for example, from the L0 layer, and for the remaining two ODDs, from the L1 layer that is opposed to the L0 layer, An example of starting recording will be described. In this case, recording is started from the inner peripheral side of the optical disk for the two ODDs, and from the outer peripheral side of the optical disk for the remaining two ODDs.
In FIG. 3 described above, in each of the ODDs 111 to 113, seek operations in which the optical pickup moves from the outermost periphery to the innermost periphery of the optical disc occur at different timings. ODD during seek operation requires not only the movement time of the optical pickup but also a rotation waiting time until the optical pickup is located at a predetermined recording start position on the optical disc, resulting in overhead and lowering the transfer speed. There is a problem to make. An embodiment that solves this problem will be described below. The embodiment differs depending on whether the number of recording layers is an even number or an odd number. First, the case of even numbers will be described.

FIG. 4 is a diagram showing the correspondence between addresses and recording data in an embodiment using even-numbered recording media. Although the case where there are two recording layers (L0 layer and L1 layer) will be described here, the case of two layers may be repeated even if there are four or more even layers (L0 layer to L3 layer). An example is shown in which the transfer speed is 1 × speed, 2 × speed, 3 × speed, and 4 × speed from the inner circumference side toward the outer circumference side.
The control unit 103 assigns logical addresses from the L0 layer to half (here, two) optical disks and assigns logical addresses from the L1 layer to the remaining half of the optical disks. Furthermore, the time required for recording on each optical disc (or ODD) is made substantially constant by shifting the position of the logical address to be assigned and changing the striping size of the data to be recorded in accordance with each layer. Thus, one characteristic is that the data transfer rate is substantially constant.

As shown in FIG. 4, physical addresses are given from the inner circumference side of the L0 layer to the outer circumference side (physical addresses 0 to 9), and then from the outer circumference side of the L1 layer to the inner circumference side (physical addresses 10 to 19). It has been. On the other hand, the control unit 103 gives a logical address from the inner periphery side of the L0 layer in the ODDs 110 and 111, and from the outer periphery side of the L1 layer in the ODDs 112 and 113.
Of the plurality of ODDs 110 to 113 constituting the RAID, ODDs 110 and 111 record one data block (data blocks 0 and 1 in the figure) on the innermost circumference (physical address 0 and logical address 0) of the L0 layer. To do. In the ODDs 112 and 113, four data blocks (data blocks 2 to 5 and 6 to 9) are recorded on the outermost periphery (physical addresses 10 to 13 and logical addresses 0 to 3) of the L1 layer.

  Next, in the ODDs 110 and 111, two data blocks (data blocks 10 to 11 and 12 to 13) are recorded in physical addresses 1 and 2 (logical addresses 1 and 2). In the ODDs 112 and 113, three data blocks (data blocks 14 to 16 and 17 to 19) are recorded in physical addresses 14 to 16 (logical addresses 4 to 6). Next, in the ODDs 110 and 111, three data blocks (data blocks 20 to 22 and 23 to 25) are recorded in physical addresses 3 to 5 (logical addresses 3 to 5). In the ODDs 112 and 113, two data blocks (data blocks 26, 27 and 28, 29) are recorded at physical addresses 17 and 18 (logical addresses 7 and 8). Further, in the ODDs 110 and 111, four data blocks (data blocks 30 to 33 and 34 to 37) are recorded in physical addresses 6 to 9 (logical addresses 6 to 9). In the ODDs 112 and 113, one data block (data blocks 38 and 39) is recorded in the physical address 19 (logical address 9).

If the data to be recorded continues, the ODDs 110 and 111 use the L1 layer from the outer periphery side to the inner periphery side, and the ODDs 112 and 113 use the L0 layer from the inner periphery side to the outer periphery side. In the case of FIG. 4, the recording is continued up to the data block 79 until the data becomes full. When the optical disc has four or more layers, the same recording is continuously performed on the L2 layer and the L3 layer.
FIG. 5 is a transition diagram showing changes in the recording position on the recording medium in FIG. The recording start position in each ODD is as shown in FIG. 4, and thereafter, recording is continued toward the outer peripheral side in the L0 layer and toward the inner peripheral side in the L1 layer as indicated by an arrow (solid line) in the figure. Is done. After reaching the outermost periphery of the L0 layer in the ODDs 110 and 111, the L1 layer is used to move from the outer peripheral side to the inner peripheral side, and in the ODDs 112 and 113, the innermost periphery of the L1 layer is reached. Recording is continued from the inner circumference side to the outer circumference side using the layer. In the ODDs 112 and 113, the recording layer used by the optical pickup is changed as indicated by an arrow (broken line) in the figure, but the position in the radial direction on the optical disc is the same, and therefore no seek operation is required.

In the above embodiment, seek operation is performed by taking advantage of the characteristics of the multi-layer disc that performs correlated opposed recording in which the L0 layer is recorded from the inner peripheral side to the outer peripheral side and the L1 layer is recorded from the outer peripheral side to the inner peripheral side. One of the features is to improve the transfer speed by reducing.
Next, an example in which the number of recording layers is an odd number (except for 1 because it is a multi-layer disc) will be described. Handling of two of the three-layer discs and handling of four of the five-layer discs may be the same as in the case of the even layers described above, but there is a new feature in the handling of the remaining one layer.

FIG. 6 is a diagram showing the correspondence between addresses and recording data in an embodiment using an odd-numbered recording medium, and particularly shows a case where there are three recording layers.
As in FIG. 4, the transfer speed is set to 1 × speed, 2 × speed, 3 × speed, and 4 × speed from the inner circumference side to the outer circumference side, and the control unit 103 assigns logical addresses to half (here, two) optical disks. Logical addresses are assigned from the L1 layer to the remaining half of the optical disks from the L0 layer. Furthermore, the time required for recording on each optical disc (or ODD) is made substantially constant by shifting the position of the logical address to be assigned and changing the striping size of the data to be recorded in accordance with each layer. Thus, one characteristic is that the data transfer rate is substantially constant.

As shown in FIG. 6, physical addresses are directed from the inner circumference side of the L0 layer to the outer circumference side (physical addresses 0 to 9), then from the outer circumference side of the L1 layer to the inner circumference side, and further from the inner circumference side of the L2 layer. It is given toward the outer peripheral side (physical addresses 20 to 29). On the other hand, the control unit 103 gives a logical address from the inner periphery side of the L0 layer in the ODDs 110 and 111, and from the outer periphery side of the L1 layer in the ODDs 112 and 113.
The process in which the ODDs 110 and 111 record each data block from logical addresses 0 to 19 and the process in which the ODDs 112 and 113 record each data block from logical addresses 0 to 9 are the same as in FIG. To do. When the ODDs 112 and 113 record each data block from the logical addresses 10 to 19, unlike the case of FIG. 4, they are not recorded in the L0 layer, but are recorded in the L2 layer. The other situations are the same as in FIG. Through the above process, recording in the L0 and L1 layers of the ODDs 110 and 111 and the L1 and L2 layers of the ODDs 112 and 113 are completed.

Subsequently, recording in the L2 layer of ODDs 110 and 111 and the L0 layer of ODDs 112 and 113 are started.
In the L2 layer of the ODDs 110 and 111, the same recording as that of the L0 layer of the same ODD is performed. First, one data block (data blocks 80 and 81) is recorded on the innermost circumference (physical address 20 and logical address 20) of the L2 layer.
At this time, in the ODDs 112 and 113, four data blocks (data blocks 82 to 85 and 86 to 89) are recorded on the outer peripheral side (physical addresses 6 to 9 and logical addresses 20 to 23) of the L0 layer. After the optical pickup seeks to the inner circumference side by four addresses, four data blocks are recorded from the inner circumference side toward the outermost circumference. Accordingly, the logical addresses 20 to 23 at the positions where the four data blocks (data blocks 82 to 85 and 86 to 89) are recorded are determined from the inner circumference side toward the outer circumference side.

Next, in the L2 layer of ODDs 110 and 111, two data blocks (data blocks 90 to 91 and 92 to 93) are recorded in physical addresses 21 to 22 (logical addresses 21 to 22).
At this time, in the L0 layer of the ODDs 112 and 113, three data blocks (data blocks 94 to 96 and 97 to 99) are assigned to logical addresses 24 to 26 (also determined from the inner peripheral side to the outer peripheral side). Record. For this reason, the optical pickup is caused to seek from the outer peripheral side to the inner peripheral side, corresponding to the sum (7) of the number of previously recorded data blocks (4) and the number of data blocks to be recorded (3) next. After that, three data blocks are recorded from the inner circumference side toward the outer circumference side.

Next, in the L2 layer of ODDs 110 and 111, three data blocks (data blocks 100 to 102 and 103 to 105) are recorded in physical addresses 23 to 25 (logical addresses 23 to 25).
At this time, in the L0 layer of the ODDs 112 and 113, two data blocks (data blocks 106 to 107 and 108 to 109) are assigned to logical addresses 27 to 28 (also determined from the inner peripheral side to the outer peripheral side). Record. For this reason, the optical pickup is sought from the outer peripheral side to the inner peripheral side and then the outer peripheral side to the outer peripheral side, corresponding to the sum (5) of the number of previously recorded data blocks and the next recorded data block. Two data blocks are recorded toward the side.

Next, in the L2 layer of ODDs 110 and 111, four data blocks (data blocks 110 to 113 and 114 to 117) are recorded in physical addresses 26 to 29 (logical addresses 26 to 29).
At this time, one data block (data blocks 118 and 119) is recorded in the logical address 29 in the L0 layer of the ODDs 112 and 113. For this reason, the optical pickup is subjected to a seek operation from the outer peripheral side to the inner peripheral side, which corresponds to the sum of the number of previously recorded data blocks and the next recorded data block (three), and then the inner peripheral side to the outer peripheral side. One data block is recorded toward the side. This completes recording on the L2 layers of ODDs 110 and 111 and the L0 layer of ODDs 112 and 113.

FIG. 7 is a transition diagram showing changes in the recording position on the recording medium in FIG. The recording start position in each ODD is as shown in FIG. 6, and thereafter, recording is continued toward the outer peripheral side in the L0 layer and toward the inner peripheral side in the L1 layer as indicated by an arrow (solid line) in the figure. Is done. After reaching the outermost periphery of the L0 layer in the ODDs 110 and 111, the L1 layer is used to move from the outer peripheral side to the inner peripheral side, and in the ODDs 112 and 113, the innermost periphery of the L1 layer is reached. Recording is continued from the inner circumference side to the outer circumference side using the layer.
Then, after reaching the innermost circumference of the L1 layer in the ODDs 110 and 111, from the inner circumference side to the outer circumference side using the L2 layer, and after reaching the outermost circumference of the L2 layer in the ODDs 112 and 113 Recording continues using the L0 layer. In the ODDs 112 and 113, the recording layer used by the optical pickup is changed as indicated by an arrow (broken line) in the figure, but the position in the radial direction on the optical disc is the same, and therefore no seek operation is required.

  FIG. 8 is a transition diagram showing a change in recording position in the specific recording layer in FIG. 6, that is, the L0 layer of the ODDs 112 and 113. In FIG. The range indicated by X in FIG. 8 corresponds to the range indicated by X in FIG. In the range shown by X, in the case of FIG. 6, actually, four data blocks are recorded as described above. As shown in FIG. 8, first, recording is started from the position indicated by Y toward the outer peripheral side at the outermost peripheral portion. The position indicated by Y is a position where the optical pickup is seek-operated from the outermost circumference to the inner circumference as much as the number of data blocks to be recorded first. After recording the first data block, seek the optical pickup from the outer peripheral side to the inner peripheral side as much as the sum of the number of previously recorded data blocks and the number of data blocks to be recorded next (broken arrows) A predetermined number of data blocks are recorded from the inner peripheral side to the outer peripheral side (solid arrow).

  In the above embodiment, seek operation is performed by taking advantage of the characteristics of the multi-layer disc that performs correlated opposed recording in which the L0 layer is recorded from the inner peripheral side to the outer peripheral side and the L1 layer is recorded from the outer peripheral side to the inner peripheral side. One of the features is to improve the transfer speed by reducing. In the two ODD L0 layers, a short-distance seek operation is performed as shown in FIG. 8, but a long-distance seek operation is not required.

  In order to reduce the seek operation in the L0 layer of the two ODDs shown in FIGS. 6 and 8, the following method can be considered. For example, the data blocks 82 to 85 and 94 to 96 in the ODD 112 of FIG. 6 are accumulated in the buffer memory provided in the ODD, and the order is changed and read out in the order of 94 to 96 and 82 to 85 and recorded in the physical addresses 4 to 9. By doing so, the seek operation for two times can be completed in one time. Of course, if the capacity of the buffer memory is sufficient, the number of seek operations can be further reduced.

When reproducing data recorded on the optical disc, the number of seek operations can be reduced using the buffer memory. For example, the data blocks may be reproduced in the order of 85, 84, 83, 82, 96, 95, and 94 in the ODD 112 of FIG. 6, stored in the buffer memory, and read out in a predetermined order.
When data is recorded, the data amount of each data block is substantially equal, but the data block before and after the seek operation is generated is reduced in view of the overhead amount due to the seek operation. There is also a method of paying the amount of data corresponding to. In this way, the data transfer rate can be improved.

The data blocks in FIGS. 2, 4, and 6 will be described. These data blocks are obtained by dividing a recording stripe having a predetermined amount of data, and have substantially the same amount of data. As shown in the present embodiment, a predetermined number of data blocks are assigned to each ODD in accordance with the recording position on the optical disc so that the transfer rate is substantially constant.
A data block (which is different from the data blocks shown in FIG. 2 and other figures) serving as a minimum unit when performing signal processing is called a sector. A plurality of (32 in BD) sectors are combined to form one cluster, and one cluster forms an ECC (Error Correction Code) block for performing error correction processing during reproduction.

The recording stripe is preferably formed by an integer number of ECC blocks. When recording data, an operation called read-modify-write is performed. In read-modify-write, it is determined whether or not the recorded data has a recording quality that can correct an error during reproduction. One ECC block straddling a plurality of recording stripes causes a complicated read-modify-write operation, and generates overhead and decreases the transfer speed. Therefore, it is preferable to do as described above.
The embodiments described so far are merely examples, and do not limit the present invention. For example, various modifications can be considered for the correspondence relationship between the block diagram of FIG. 1 and the addresses and recording data of FIG. 2, FIG. 4, and FIG. As described above, different embodiments can be conceived based on the gist of the present invention, and all are within the scope of the present invention.

  101: LAN unit, 102: memory, 103: control unit, 104: HDD, 105-107: IF unit, 108-113: ODD, 114: accessor.

Claims (5)

A recording / reproducing apparatus for recording and reproducing a recording stripe including information data on a multilayer optical disc having a plurality of recording layers,
A plurality of optical disk drives for recording and reproducing information data with respect to the mounted multilayer optical disk;
A control unit for controlling the operation of the optical disc drive;
The control unit
Dividing and supplying the recording stripe to be recorded to the optical disc drive,
The recording stripes after the division are positioned at different transfer speeds on the optical disk mounted on half of the optical disk drives in the optical disk drive and on the optical disk mounted on the remaining half of the optical disk drives in the optical disk drive. In order to record, the logical address at the time of recording is determined and supplied to the optical disc drive,
When dividing the recording stripe, the data stripe is divided and determined so that the transfer time of the divided recording stripes in the optical disc drive is approximately equal,
The optical disc drive records the divided recording stripes on the first recording layer of the optical disc from the inner circumference side to the outer circumference side of the optical disc, and on the second recording layer of the optical disc. Controls to record the divided recording stripes from the outer peripheral side to the inner peripheral side of the optical disc ,
When the number of recording layers of the optical disc is an odd number, the control unit includes one of the recording layers of the optical disc in half of the optical disc drives in the optical disc drive, and the divided recording stripes. Is recorded and recorded in a radial direction opposite to the predetermined direction . 2. The recording / reproducing apparatus according to claim 1 , wherein when the number of recording layers of the optical disc is an even number, the control unit determines that the remaining half of the optical disc drives are the L0 layer and the L1 layer in this order. An optical disk drive is controlled to record the divided recording stripes in the order of L1 layer and L0 layer. 2. The recording / reproducing apparatus according to claim 1 , wherein any one of the recording layers is an L0 layer. A recording and reproducing apparatus according to claim 3, when the recording layer of the optical disc is a three-layer, the control unit, L1 layer in the optical disc drive of half of the optical disk is mounted, including the L0 layer, L2 layers, in the order of L0 layer, the L0 layer in the optical disc drive half remaining, L1 layer, the recording and reproducing apparatus and controls to record the divided recorded stripes in order of L2 layer. 2. The recording / reproducing apparatus according to claim 1 , wherein the recording stripe includes an integer number of ECC blocks that are not divided.

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