JP2016110685A - Information recording reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording reproducer capable of improving the reliability in a recording/reproducing operation of data in an optical disc.SOLUTION: An information recording reproducer manages a recording region of an optical disc while dividing it into a first recording region on the inner peripheral side of a predetermined radius (boundary radius), as the boundary, in the radial direction of the optical disc and a second recording region on the outer peripheral side thereof. The information recording reproducer records or reproduces data in the first recording region at a first speed (for example, 10 times speed), and records or reproduces data in the second recording region at a second speed (for example, 5 times speed) lower than the first speed. The predetermined radius (boundary radius) is set at the boundary between a region in which the control residual when servo control related to focus and tracking for the recording region of the optical disc is performed exceeds a predetermined reference value and a region in which it does not exceed the predetermined reference value.SELECTED DRAWING: Figure 10

Description

  The present disclosure relates to an information recording / reproducing apparatus that records or reproduces data on an optical disc.

  As an information recording / reproducing apparatus for recording / reproducing data such as moving pictures and sounds, a removable recording medium such as an optical disk and an information recording / reproducing apparatus such as an optical disk drive apparatus handling the same have been developed (Patent Document 1, etc.) reference). Optical discs are superior to other recording media in that data can be stored for a long period of time.

  However, if the recording mark or recording film of the optical disc deteriorates with time and the degree of deterioration becomes severe, recorded data may not be reproduced.

  Also, in a drive device that records or reproduces data on or from an optical disk, internal components and mechanisms are deteriorated depending on the storage environment, usage conditions, and the like. Deterioration of internal components and mechanisms may cause problems such as a decrease in the quality of a reproduction signal and a failure to properly form a recording mark, and may cause a defective data recording / reproducing operation on an optical disc.

  In addition, variations in the optical disc manufacturing process (variations in recording tracks) also cause focus errors and tracking errors, and in some cases, servo control is broken and recording / reproducing operations may be defective.

JP-A-7-93803 JP 2002-8323 A JP-A-4-134772 JP 2007-335012 A Japanese Patent Laid-Open No. 8-1111074 JP 2007-80363 A

  In general, a data center that manages a large amount of data in a centralized manner uses a plurality of recording / reproducing devices to manage the data, and is highly reliable so that data can be recorded and reproduced at any time according to user requests. Sex is required. However, if there is aged deterioration or disc manufacturing variation as described above, data cannot be recorded or reproduced correctly on the optical disc, and the reliability is lowered.

  The present disclosure provides an information recording / reproducing apparatus capable of improving the reliability of data recording / reproducing operations with respect to an optical disc.

In a first aspect of the present disclosure, a first information recording / reproducing apparatus for recording or reproducing data on an optical disc is provided. The first information recording / reproducing apparatus includes a recording / reproducing unit that records or reproduces data using laser light on an optical disc, and a control unit that controls the recording / reproducing unit.
The control unit manages the recording area of the optical disc by dividing it into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with a predetermined radius in the radial direction of the optical disc as a boundary. The control unit records or reproduces data at the first speed with respect to the first recording area, and records or reproduces data at the second speed slower than the first speed with respect to the second recording area. The recording / reproducing unit is controlled to reproduce.
The predetermined radius is set at a boundary between an area where the control residual when the servo control related to focus and tracking is performed on the recording area of the optical disc exceeds a predetermined reference value and an area where the control residual does not exceed.

In a second aspect of the present disclosure, a second information recording / reproducing apparatus for recording or reproducing data on an optical disc is provided. The second information recording / reproducing apparatus includes a pickup that emits laser light, and includes a recording / reproducing unit that records or reproduces information by irradiating the optical disc with laser light, and a control unit that controls the recording / reproducing unit.
The control unit manages the recording area of the optical disc by dividing it into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with a predetermined radius in the radial direction of the optical disc as a boundary.
The predetermined radius is set at the end of an area where the control residual in servo control related to focus and tracking is equal to or less than a predetermined reference value with respect to the recording area of the optical disc.
When recording or reproducing data from a target position in the second recording area, the control unit traverses the pickup to the innermost circumferential position of the second recording area, and moves while traversing the pickup while performing servo control. At the same time, the control residual in the servo control is stored in the storage means. When the pickup reaches the target position, the control unit performs servo control using the control residual stored in the storage unit, and starts recording or reproducing data from the target position.

In a third aspect of the present disclosure, a third information recording / reproducing apparatus for recording or reproducing data on an optical disc is provided. The third information recording / reproducing apparatus includes a pickup that emits laser light, and includes a recording / reproducing unit that records or reproduces information by irradiating the optical disc with laser light, and a control unit that controls the recording / reproducing unit.
The control unit manages the recording area of the optical disc by dividing it into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with a predetermined radius in the radial direction of the optical disc as a boundary.
The predetermined radius is set at the end of an area where the control residual in servo control related to focus and tracking is equal to or less than a predetermined reference value with respect to the recording area of the optical disc.
When recording or reproducing data from the target position in the second recording area, the control unit reduces the rotational speed of the optical disk, traverses the pickup to the target position, and sets the rotational speed of the optical disk in the traversed area. While increasing, the pickup is servo-controlled and the control residual in the servo control is stored in the storage means. Thereafter, when the rotational speed of the optical disk reaches a predetermined rotational speed, the control unit performs servo control using the control residual stored in the storage means and starts recording or reproducing data from the target position.

  According to the information recording / reproducing apparatus of the present disclosure, data can be recorded or reproduced with respect to the optical disc with high reliability.

FIG. 5 shows a configuration of an information recording / reproducing apparatus in the first embodiment. The figure which shows the structure of the magazine which stored several optical disks in Embodiment 1. FIG. The figure which shows the structure of the drive of the information recording / reproducing apparatus in Embodiment 1. A diagram explaining the logical configuration of the recording area of an optical disc 7 is a flowchart showing failure prevention diagnosis processing by the information recording / reproducing apparatus in the first embodiment. Flow chart showing details of failure determination processing in failure prevention diagnosis processing The figure which shows the time-dependent change of the evaluation parameter | index (error rate) of the drive in an information recording / reproducing apparatus. The figure which shows the structure of the information recording / reproducing apparatus corresponding to a double-sided type optical disk in Embodiment 2. FIG. The figure which shows the structure of the drive corresponding to a double-sided type optical disk in Embodiment 2. FIG. 7 is a flowchart showing failure prevention diagnosis processing by the information recording / reproducing apparatus in the second embodiment. (A) A diagram explaining the relationship between the radius of the optical disc and the control residual, and (B) a diagram explaining the relationship between the radius of the optical disc and the recording speed. Flowchart showing determination process of boundary radius of optical disc in the third embodiment 9 is a flowchart showing processing for switching the recording speed in accordance with the data recording area in the third embodiment. The figure explaining the user data area recorded at high speed, and the spare area recorded at low speed in Embodiment 3 The figure explaining actual motor control when varying the access speed according to the access area in the third embodiment The figure for demonstrating the process at the time of the data access in Embodiment 4 The figure explaining the process of the information recording / reproducing apparatus in Embodiment 4 The figure for demonstrating the process at the time of the data access in Embodiment 5 The figure explaining the process of the information recording / reproducing apparatus in Embodiment 5

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
In an optical disc, a recording mark formed on the optical disc deteriorates depending on a storage environment, a use situation, and the like. As a result, the signal quality reproduced by the optical disk drive device deteriorates, and in the worst case, the recorded information cannot be read (deterioration of data recorded on the optical disk). Further, due to the deterioration over time of the recording film of the optical disc, it becomes difficult to form a recording mark, and it becomes difficult to record data. In the worst case, recording cannot be performed so as to obtain a reproduction signal having a quality that can be reproduced by the optical disk drive device (deterioration of recording performance of the optical disk).

  Also in optical disk drive devices, depending on the storage environment, usage conditions, etc., characteristics of laser light may deteriorate, dust may adhere, the transmission path for transmitting reproduced signals may deteriorate, the spindle motor that rotates the optical disk may deteriorate, etc. To do. Such a deteriorated reproduction signal from the optical disk drive device cannot be reproduced correctly even if it is a record mark at a level that can be reproduced without any problem with a normal optical disk drive device, and the quality of the reproduced reproduction signal is deteriorated. (Deterioration of the reproduction performance of the optical disk drive device). In addition, recording marks cannot be formed correctly due to factors such as deterioration of laser light characteristics and recording signal transmission path (deterioration of recording performance of the optical disk drive device).

  As described above, due to deterioration over time of at least one of the optical disk and the optical disk drive device, normal data recording and reproduction on the optical disk may be difficult and may cause a failure (malfunction). The present embodiment provides an information recording / reproducing apparatus capable of diagnosing a failure in the information recording / reproducing apparatus and determining whether the cause of the failure is an optical disc or the information recording / reproducing apparatus.

1.1 Configuration of Information Recording / Reproducing System FIG. 1 is a diagram illustrating a configuration of an information recording / reproducing system using an optical disc as a recording medium in the present embodiment.

  The information recording / reproducing system 10 includes an information recording / reproducing apparatus 100 that records and reproduces information on an optical disc 101, and a host server 109 that instructs the information recording / reproducing apparatus 100 to record and reproduce information. The information recording / reproducing apparatus 100 and the host server 109 exchange data and commands through a host interface (hereinafter referred to as “first and second host I / Fs”).

  The host server 109 transmits a command for instructing the information recording / reproducing apparatus 100 to record and reproduce data. The host server 109 includes a controller 111 that implements functions to be described later by executing a program, and a non-volatile memory 113. The controller 111 of the host server 109 is composed of a CPU, and realizes functions to be described later by executing a predetermined program.

  The information recording / reproducing apparatus 100 includes a magazine 103 that stores a plurality of optical disks 101 and a plurality of optical disk recording / reproducing apparatuses (hereinafter referred to as “drives”) 104 that are provided for each optical disk 101 and record or reproduce data on the optical disk 101. ˜107 and a mechanical control unit 102 that conveys the optical disk from the magazine 103 to the drives 104 to 107.

  The magazine 103 is an example of a disk storage unit that can store a predetermined number of optical disks 101. The optical disc 101 of this embodiment is a write-once type optical disc and has a recording layer only on one side. FIG. 2 is a diagram illustrating a configuration of the magazine 103 in which a plurality of optical disks 101 are stored. As shown in FIG. 2, the magazine 103 stores a plurality of optical discs 101. In the present embodiment, it is assumed that twelve write-once optical disks 101 are stored in one magazine 103. In order to improve the accumulation capacity, the magazine 103 is not provided with a tray, and is stored in a direct stack system in which a plurality of optical disks 101 are directly stacked. The optical disc 101 is taken out from the magazine 103 one by one by the mechanical control unit 102. In the configuration shown in FIG. 1, the information recording / reproducing apparatus 100 has only one magazine 103, but the configuration of the information recording / reproducing apparatus 100 is not limited to this. The information recording / reproducing apparatus 100 may include a plurality of magazines 103.

  The drives 104 to 107 have a function of recording or reproducing data on the optical disc 101. Each of the drives 104 to 107 has a tray 108 for transporting the optical disc 101 into the drive.

  FIG. 3 is a diagram illustrating an internal configuration of the drives 104 to 107. As shown in FIG. 3, the drives 104 to 107 include a pickup 301 that records and reproduces information by irradiating the optical disc 101 with laser light, and a pickup 301 that records and reproduces information at a predetermined position on the optical disc 101. A traverse mechanism 302 for moving, a spindle motor 303 for rotating the optical disc 101, a magnet 304 for fixing the optical disc 101 on the spindle motor 303, a controller 305 for controlling the pickup 301, the traverse mechanism 302, and the spindle motor 303, And a non-volatile memory 306.

  The controller 305 is composed of a CPU, and realizes functions to be described later by executing a predetermined program. The controller 305 has a second host I / F that can bidirectionally communicate data and various commands to an external host server 109 connected to the drives 104 to 107. Furthermore, the controller 305 has a signal processing function for decoding data from a signal from the pickup 301 and correcting an error in order to reproduce data recorded on the optical disc 101. The controller 305 can measure signal quality such as an error rate, and stores the signal quality measurement results in the nonvolatile memory 306 in time series. The measurement result of the signal quality can be transmitted to the host server 109 via the second host I / F. In addition, various information necessary for the control of the controller 305 can be transmitted to the host server 109.

  The host server 109 performs optimal control of the information recording / reproducing apparatus 100 using information transmitted from the drives 104 to 107. When recording data on the optical disc 101, the controller 305 receives the data via the second host I / F and converts the received data into recording data. The controller 305 records data by irradiating the optical disc 101 with a recording pulse based on the recording data from the pickup 301. The information recording / reproducing apparatus 100 shown in FIG. 1 includes four drives, but the drive configuration is not limited to this. The information recording / reproducing apparatus 100 may have three or less drives or five or more drives.

  The mechanical control unit 102 has a function of taking out the optical disk 101 from the magazine 103 and transporting it to any of the drives 104 to 107 and loading it, and a function of taking out the optical disk 101 from each drive 104 to 107 and storing it in the magazine 103. Have. That is, the mechanical control unit 102 includes a mechanism for taking out the optical disk 101 from the magazine 103, a mechanism for transporting the optical disk 101, a mechanism for storing the optical disk 101 in the magazine 103, and a controller for controlling each mechanism. . Further, the mechanical control unit 102 includes a mechanism for pulling out or pushing in the optical disk 101 in the magazine 103, and the optical disk 101 can be taken out from the magazine 103 one by one by the mechanism.

  Next, an interface (I / F) between the information recording / reproducing apparatus and the host server 109 will be described. As shown in FIG. 1, the information recording / reproducing apparatus 100 is connected to a host server 109 via a first host I / F and a second host I / F.

  The first host I / F is an interface for performing communication and control with the mechanical control unit 102 in the information recording / reproducing apparatus 100. For example, an iSCSI (Internet Small Computer System Interface) or a USB is used.

  The second host I / F is an interface for performing communication and control with the drives 104 to 107 in the information recording / reproducing apparatus 100. For example, SAS (Serial Attached SCSI), iSCSI, FC (Fiber Channel), or SATA. (Serial ATA) or the like is used. From the host server 109, all the drives 104 to 107 are connected to be controllable one by one via the second host I / F. The information recording / reproducing apparatus 100 and the host server 109 may be further connected to a serial interface or the like. The information recording / reproducing apparatus 100 may include a SAS-SATA conversion substrate. In this case, the host server 109 and the information recording / reproducing apparatus 100 may be connected by SAS, and within the information recording / reproducing apparatus 100, each drive may be connected by SATA.

1.2 Structure of Optical Disc FIG. 4A is a diagram illustrating the logical configuration of the recording area of the optical disc in the present embodiment. The disc-shaped optical disc 101 is provided with one or more recording layers capable of recording and reproducing information. In this recording layer, a number of tracks 402 are formed in a spiral shape, and a number of blocks 403 divided into a plurality of blocks are formed in each track 402. By wobbling the groove of the track 402, address information (hereinafter referred to as a physical address) indicating a detailed position on the disk is given to the groove.

  Here, the track 402 improves the recording density of the track by recording the data of the optical disk, which has been conventionally recorded only in the groove (groove) or land (between grooves), in both the groove and land. Also good.

  The width (track pitch) of the track 402 is 0.32 μm for a Blu-ray (registered trademark) disk (BD), for example. A block 403 is a unit for error correction, and is a minimum unit for performing recording and reproduction operations. For example, the size is 1 ECC (size: 32 Kbytes) in the case of DVD (registered trademark), and 1 cluster (size: 64 Kbytes) in the case of BD. When described using a unit called a sector (size: 2 KB) which is the minimum unit of data on an optical disk, 1 ECC = 16 sectors, 1 cluster = 32 sectors. Note that when “cluster” is described in the following description, the cluster has the same meaning as the block 403.

  The optical disc 101 has an inner peripheral area 404, a data area 405, and an outer peripheral area 406.

  FIG. 4B is a diagram showing the area structure of the optical disc 101. The data area 405 includes a user data area 405-2 in which user data is recorded, an ISA (Inner Spare Area) (405-1) and OSA provided on the inner and outer peripheral sides of the user data area 405-2, respectively. (Outer Spare Area) (405-3). The ISA (405-1) and OSA (405-3) are spare areas including a replacement area used for replacement recording of a defective area detected in the user data area 405-2.

  The inner peripheral area 404 and the outer peripheral area 406 mainly include areas for recording management information necessary for recording / reproducing information on / from the optical disc 101. The inner circumference area 404 and the outer circumference area 406 serve as a margin area so that the pickup 301 (FIG. 3) can follow the track 402 even if the pickup 301 overruns when accessing the end of the data area 405. Fulfill.

  The inner peripheral area 404 is an area sometimes referred to as “lead-in”, and is an area where the optical disk drives 104 to 107 (FIG. 3) perform recording and reproduction as necessary. Unlike the user data area 405-2, the inner circumference area 404 is an area in which the user cannot directly perform recording and reproduction. The inner peripheral area 404 includes areas such as a BCA (Burst Cutting Area) 404-1, a drive area (Drive Area) 404-2, and a management information area (Defect Management Area: DMA) 404-3.

  The BCA 404-1 is a pre-recording area in which the disc-related information and the unique information for each disc are formed on the barcode using a special device in the manufacturing stage of the optical disc 101. For example, the reflection film is removed by laser light. It is the area | region formed. In the BCA 404-1, for example, information such as a serial number unique to each optical disc 101 is stored.

  The drive area 404-2 is an area including information necessary for controlling the optical disk drives 104 to 107, and information may be freely recorded therein.

  The management information area 404-3 is an area in which management information such as information on the area structure of the data area 405 in the optical disc 101, information on defective blocks, or information indicating the recording state of the optical disc 101 can be transiently recorded.

  In addition, the inner peripheral area 404 of the optical disk 101 includes other areas such as an OPC area for adjusting the recording power of the optical disk drives 104 to 107 and a PreWrite area for tracking / focus adjustment. However, a description thereof will be omitted.

1.3 Failure factor of information recording / reproducing apparatus The failure of the information recording / reproducing apparatus 100 means a state in which recorded data cannot be read. The following three factors can be considered as failure factors.

  The first factor is due to the quality of the optical disc 101. The factors resulting from the quality of the optical disc 101 include the recording quality due to a defect that partially occurs in the optical disc 101 and the fact that recording cannot be performed under the same conditions due to a sudden change in recording film characteristics even when the recording conditions are optimized. There is a decrease in recording quality due to deterioration of the recording film and deterioration of the recording film over time due to long-term storage.

  The second factor is a decrease in recording quality due to the non-optimal recording conditions of the drives 104-107. That is, the recording quality is deteriorated due to non-optimal recording parameters such as recording power and recording pulse.

  A third factor is a decrease in recording quality due to deterioration in reproduction performance due to aging of the drives 104 to 107 and checking the recording quality in that state.

  Next, countermeasures for the above-mentioned failure factor will be described.

  Among the first factors, there is a possibility that a disc that is somewhat inferior in the shipping inspection can be eliminated with respect to defects partially generated in the optical disc 101 and changes in the characteristics of the recording film. Further, by using the defect replacement system that records the defective area described above in the alternative recording area, there is a possibility that the situation where the recording data cannot be read can be eliminated. As described above, if it is a partial area immediately after recording, there is a possibility that the situation where the recording data cannot be read can be eliminated by using the defect replacement system. Since this defect replacement system supports only a failure in a partial area, it may not be able to cope with a large number of defective areas. The deterioration in recording quality due to deterioration of the recording film over time due to long-term storage may not be a partial failure but a failure of the entire disk, so an immediate data recovery operation is required.

  The second factor, the deterioration of the recording state due to the non-optimal recording conditions of the drives 104 to 107, can be eliminated with a considerable probability because the recording quality can be confirmed by the recording test before the actual recording start. there is a possibility.

  There is a case where it is determined that the recording quality is poor although the reproduction performance is deteriorated due to aged deterioration of the drives 104 to 107, which is the third factor, and the recording state is good. Since it is difficult to avoid the deterioration of the drives 104 to 107 over time, the deterioration state of the apparatus can be determined by periodic determination described later.

1.4 Signal Quality Determination Function Next, the signal quality determination function of the drives 104 to 107 in the information recording / reproducing apparatus 100 will be described.

  The management information in the optical disc 101 records in which physical address range on the disc the data is recorded. Based on the information, a measurement area (address range) for determining signal quality is determined. Since the recording film of the disc may have different characteristics on the inner periphery side and the outer periphery side, signal quality determination may be performed at least at two locations on the inner periphery side and the outer periphery side. Further, when the disc is a multi-layer disc, the recording film characteristics may be different for each layer, so the signal quality may be judged for each layer.

An error rate index can be used for signal quality determination. The error rate is calculated in error correction units in the determined measurement area. In the case of BD, the error correction unit is one cluster (size: 64 Kbytes). In order to ensure measurement accuracy of the error rate index, it is desirable to measure a plurality of clusters. Further, when the error rate is measured, an error rate related to a random error from which a burst is removed (hereinafter referred to as “random error rate”) is also calculated. Thereby, when the error rate is low, it can be determined whether it is due to a defect or a random error that occurs when the recording quality is poor. For example, the burst error may be defined as 40 bytes or more, and only errors less than 40 bytes may be counted and calculated as a random error rate. Further, when the signal quality is confirmed by deleting even a minute defect, only the error of 1 byte or 2 bytes may be counted and calculated as a random error rate. The criterion of the symbol error rate in the case of BD is generally about 4.2 × 10 ⁻³ because of error correction capability. When considering the system margin, it is necessary to lower the criterion value further than this value. On the other hand, when it is known that the reproduction performance of the drive has deteriorated and the recording quality of the disc is determined, the above criteria value may be increased. The criteria may be changed each time according to the criterion.

  The signal quality determination index is not limited to the error rate index. Signal quality indicators such as jitter, asymmetry, β, modulation depth, etc. can also be used.

1.5 Failure Prevention Diagnosis Processing The following processing relates to failure prevention diagnosis processing for confirming the state of the optical disc and the information recording / reproducing apparatus before data cannot be read by determining signal quality. By determining the diagnosis result of the failure prevention diagnosis process, it is possible to take a countermeasure in advance for preventing the occurrence of the failure.

  The information recording / reproducing apparatus 100 in the present embodiment includes a plurality of optical disks 101 and a plurality of drives (optical disk recording / reproducing apparatuses) 104 to 107. In such a configuration, by determining the signal quality with the combination of the optical disc 101 and the drives 104 to 107, it is a failure caused by the disc or a failure caused by the drive, or a failure tendency (the criteria are not exceeded). It is possible to diagnose whether it is in a state exhibiting close characteristics).

  Specifically, the quality of a specific optical disk is confirmed by a plurality of drives, and if it is determined that the quality of the reproduction signal is poor by the plurality of drives, it can be determined that there is a possibility of failure due to the disk. On the other hand, if it is determined that the signal quality is poor with only a specific drive, it can be determined that there is a possibility of failure due to the drive.

  With reference to FIG. 5A and FIG. 5B, the procedure of a specific failure prevention diagnosis process will be described.

  5A and 5B show an example of processing for confirming the recording state of a certain optical disc 101 using three drives. The operation of each step is realized by the mechanical control unit 102 and the controller 305 of each drive 104 to 106 performing control according to commands sequentially issued from the host server 109.

  1) The controller 111 of the host server 109 issues a command for taking out one specific disk from the magazine 103 and transporting it to the drive 104 via the first host I / F. In response to this command, the controller of the mechanical control unit 102 takes out one specific disk from the magazine 103 and loads it into the first drive 104 (S11).

  2) Next, the controller 111 of the host server 109 causes the information recording / reproducing apparatus 100 to measure an error rate during reproduction of the optical disc in the drive 104 (S12). Therefore, the controller 111 of the host server 109 issues a command for taking out the tray 108 of the drive 104 via the second host I / F, and places the optical disc 101 on the tray 108 via the first host I / F. Issue a command. Then, the controller 111 of the host server 109 issues a command for inserting the optical disk 101 and starting the drive 104 via the second host I / F. Then, the controller 111 of the host server 109 issues a command for measuring the error rate of the optical disc 101 via the second host I / F.

  When the information recording / reproducing apparatus 100 receives these commands from the host server 109, the mechanical control unit 102 places the optical disc 101 on the tray 108. The drive 104 inserts the optical disc 101 into the inside, reproduces the optical disc 101, reads out information (details will be described later) necessary for starting the drive, and starts up using the read information. Thereafter, the drive 104 measures the error rate of a predetermined area on the optical disc, acquires the measurement result (A), and transmits it to the host server 109. Thereafter, the controller 111 of the host server 109 stops the drive 104 and controls the information recording / reproducing apparatus 100 to take out the tray 108 of the optical disk 101.

  3) Next, the controller 111 of the host server 109 issues a command via the first host I / F, takes out the optical disk 101 from the tray 108, and conveys the disk to the second drive 105.

  4) Next, the controller 111 of the host server 109 causes the information recording / reproducing apparatus 100 to measure an error rate during reproduction of the optical disk in the drive 105 (S13). Therefore, the host server 109 issues a command via the second host I / F, takes out the tray 108 of the drive 105, issues a command via the first host I / F, and removes the optical disk 101 from the tray 108 of the drive 105. To place. The controller 111 of the host server 109 issues a command via the second host I / F, and inserts the optical disk 101 into the drive 105 and activates the drive 105. Then, the controller 111 of the host server 109 issues a command for measuring the error rate of the optical disc 101 via the second host I / F.

  When the information recording / reproducing apparatus 100 receives these commands from the host server 109, the mechanical control unit 102 places the optical disc 101 on the tray 108. The drive 105, after inserting the optical disc 101 into the inside, reproduces the optical disc 101, reads information necessary for starting the drive, and starts using the read information. Thereafter, the drive 105 measures the error rate of a predetermined area on the optical disc 101, acquires the measurement result (B), and transmits it to the host server 109. Thereafter, the host server 109 stops the drive 105 and takes out the tray 108 of the drive 105.

  5) The controller 111 of the host server 109 issues a command via the first host I / F, takes out the optical disk 101 from the tray 108 of the drive 105, and conveys the optical disk 101 to the third drive 106.

  6) The controller 111 of the host server 109 causes the information recording / reproducing apparatus 100 to measure an error rate when reproducing the optical disk in the drive 106 (S14). For this reason, the controller 111 of the host server 109 issues a command via the second host I / F, takes out the tray 108 of the drive 106, issues a command via the first host I / F, and places the optical disk 101 in the tray 108. To place. Further, the controller 111 of the host server 109 issues a command via the second host I / F, inserts the optical disk 101 and starts the drive 106, and measures the error rate. The drive 106 measures the error rate of a predetermined area on the optical disc 101, acquires the measurement result (C), and transmits it to the host server 109. Thereafter, the host server 109 stops the drive 106 and takes out the tray 108 of the drive 106.

  7) Thereafter, the optical disk 101 is returned to the magazine 103 and stored. Therefore, the controller 111 of the host server 109 issues a command via the first host I / F, takes out the optical disk 101 from the tray 108 of the drive 106, conveys the optical disk 101 to the magazine 103, and loads the optical disk 101 into the magazine 103. insert.

  8) The controller 111 of the host server 109 makes a failure determination from the measurement results (A) to (C) (S16). That is, the presence / absence of a failure and the diagnosis of whether the failure is on the disk side or the drive side are performed.

  FIG. 5B is a flowchart showing failure determination processing by the controller 111 of the host server 109. The controller 111 of the host server 109 makes a failure determination based on the measurement results (A) to (C). Specifically, when all the error rates indicated by the measurement results (A) to (C) are not less than the criteria (YES in S21), the controller 111 determines that there is a possibility that the optical disc 101 has a failure (S25). ). On the other hand, when the measured error rate is equal to or higher than the criterion for only some of the drives (YES in S22), it is determined that there is a possibility of failure in the some of the drives (S24). Further, when all of the error rates indicated by the measurement results (A) to (C) are below the criteria (NO in S22), the controller 111 indicates that there is a possibility of failure in any of the optical disc 101 and the drives 104 to 106. It is determined that there is not (S23).

  In the above example, an example in which three drives are used is shown, but the present invention is not limited to this. If signal quality diagnosis is performed using at least two or more drives, failure determination can be performed. In order to further improve the accuracy of failure determination, four or more drives may be used.

  When the error rate is measured with a plurality of drives, since the drive is repeatedly started and stopped, processing time is required for drive startup. The startup time of the drive can be shortened by the following method, for example.

  That is, since the start and stop of one specific disk is repeated, each drive shares information necessary for starting the optical disk 101 via the host server 109, so that the start time can be shortened. Information shared as necessary information at the time of start-up includes type information such as BD and BDXL (registered trademark) for discriminating the type of disc, the number of recording layers, disc type information such as a single-sided or double-sided disc, etc. including. Alternatively, the shared information may include information recorded in the disc-specific BCA 404-1 and / or management information area 404-3 described above. The host server 109 stores the information in the memory 113 when the information is read when the first drive is activated. Then, the stored information is transmitted to the second and subsequent drives, and when the second and subsequent drives are started, the drive is started using the information stored in the memory 113. As a result, it is possible to omit (skip) the disc determination processing and the optical disc playback processing for obtaining the startup information, which are executed in the startup processing of the second and subsequent drives when measuring the error rate, Startup time can be shortened.

  The command (control) from the host server 109 may be realized by a packaged API command.

1.6 Failure Prevention Diagnosis Processing Considering Drive Reproduction Performance The reproduction performance of the drives 104 to 107 varies from drive to drive, and the aging deterioration speed may vary. In such a case, even if the signal quality evaluation by a plurality of drives is performed, an appropriate signal quality evaluation of the optical disc may not be performed. Therefore, hereinafter, a signal quality evaluation method in consideration of a change over time in the reproduction quality level for each drive will be described. Each of the drives 104 to 107 stores the result of evaluating the recording quality of the optical disc 101 that changes over time with respect to the time of shipment in the memory 306 or the like, and evaluates the signal quality using the temporal change of the stored recording quality. To implement.

  FIG. 6 is a diagram showing a change over time in the reproduction performance of a drive in which an evaluation index (error rate) of a certain drive is plotted on the vertical axis and elapsed time is plotted on the horizontal axis. Various factors such as media factors, recording condition factors, and playback parameter factors can be considered for the measurement variation. When the maximum value, minimum value, and average value are memorized and plotted for each predetermined elapsed time (elapsed time from the time of drive manufacture), it is observed that the evaluation index gradually deteriorates with variation σ. It was done.

  When diagnosing the recording quality of a disk using a drive having such deterioration characteristics that change with time, there is a possibility that an appropriate quality diagnosis cannot be performed with a fixed criterion. Therefore, by changing the criteria over time based on the deterioration characteristics of the drive over time and performing signal quality evaluation using the criteria, failure prevention diagnosis in consideration of the reproduction performance of the drive becomes possible.

  As shown in FIG. 6, the drive performance deterioration amount at the measurement time B (= the average value of the performance of the measurement initial A and the measurement) at the measurement time B with the characteristics at the measurement initial A as the measurement result (reference value) with appropriate reproduction quality. The difference in the average value of the measurement performance at time B) is obtained. Then, by setting the criteria over time in consideration of the drive performance deterioration amount and measurement variation σ, and evaluating the optical disc using the criteria set over time, the recording quality of the disc that changes over time can be appropriately set. Can be judged.

Specifically: Set criteria that change over time for each drive.
Criteria =
Reference criteria (4.2 × 10 ⁻³ ) + drive performance deterioration amount + measurement variation When the initial drive performance is managed and shipped, the initial measurement performance is treated as 0 or a predetermined fixed value. You can also. When the fixed value is sufficiently small, the drive performance deterioration amount can be an average value of the reproduction performance measured at a predetermined time.

  As described above, criteria that change over time are set for each drive. Then, using the criteria set for each drive, failure determination is performed in the same procedure as described in “1.5 Failure prevention diagnosis processing”.

  This method assumes that the quality of the disk is managed to some extent and is shipped, and that the change in characteristics is in a range that does not affect the signal quality in the drive.

  Of course, the failure of the drive can be predicted by the data for each drive shown in FIG. 6, and it can be used for services such as notification of advance replacement.

  According to the information recording / reproducing apparatus 100 of the present embodiment, it is possible to determine whether there is a possibility that normal data access by the information recording / reproducing apparatus 100 cannot be performed. Since it can be determined whether the recording / reproducing apparatus 100 (drives 104 to 106) is present, an appropriate response can be made before data loss.

(Embodiment 2)
In the first embodiment, the failure prevention diagnosis process in the information recording / reproducing apparatus including the drives 104 to 107 for recording and reproducing information with respect to the optical disc 101 having the recording layer only on one side has been described. In the present embodiment, failure prevention diagnosis in an information recording / reproducing apparatus provided with an optical disc having recording layers on both sides (hereinafter also referred to as “double-sided type optical disc”) and a drive capable of simultaneously recording and reproducing on both sides of the double-sided type optical disc. Processing will be described. Note that the same constituent elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated.

2.1 Configuration of Information Recording / Reproducing Device FIG. 7 is a diagram showing a configuration of an information recording / reproducing device using an optical disc in the present embodiment. The information recording / reproducing apparatus 700 of this embodiment also records or reproduces data on the write-once optical disc 110 having recording layers on both sides in response to an instruction from the host server 109.

  The information recording / reproducing apparatus 700 includes a magazine 103 that houses a plurality of double-sided optical disks 110, a plurality of drives (optical disk recording / reproducing apparatuses) 704 to 707 that record or reproduce data on the double-sided optical disks 110, and drives from the magazine 103. And a mechanical control unit 102 for conveying the optical disk 110 to 704 to 707.

  The drives 704 to 707 have a function of recording or reproducing data on both sides of the double-sided optical disc 110 simultaneously. Each of the drives 704 to 707 has a tray 708 for transporting the optical disk 110 into the drive. Since the drives 704 to 707 have the same configuration, the configuration and operation of the drive 704 will be described below on behalf of the drives 704 to 707.

  FIG. 8 is a diagram showing an internal configuration of the drive 704. As shown in FIG. 8, the drive 704 includes pickups 801 a and 801 b that record and reproduce data by irradiating the optical disc 110 with laser light, traverse mechanisms 802 a and 802 b that move the pickups 801 a and 801 b, and the optical disc 110. A spindle motor 803 for rotating the optical disk 110, a magnet 804 for fixing the optical disc 110 on the spindle motor 803, a controller 805a for controlling the pickup 801a, traverse mechanism 802a, and spindle motor 803, and controlling the pickup 801b and traverse mechanism 802b. Controller 805b. Furthermore, the drive 704 includes nonvolatile memories 806a and 806b that store information used for control by the controllers 805a and 805b.

  Each of the controllers 805a and 805b is composed of a CPU, and realizes functions to be described later by executing a predetermined program. The controllers 805a and 805b have a second host I / F that can bidirectionally communicate data and various commands to the external host server 109 connected to the drive 704. Further, the controllers 805a and 805b have a signal processing function of decoding data from signals from the pickups 801a and 801b and correcting errors in order to reproduce data recorded on the optical disc 110. The controllers 805a and 805b store the nonvolatile memories 806a and 806b. The measurement result of the signal quality can be transmitted to the host server 109 via the second host I / F. In addition, various information necessary for control of the controllers 805a and 805b can be transmitted to the host server 109.

  The host server 109 can perform optimal control of the information recording / reproducing apparatus 700 using the information transmitted from the drives 704 to 707. When recording data on the double-sided optical disc 110, the controllers 805a and 805b receive the data via the second host I / F and convert the received data into recording data. The controllers 805a and 805b can record by irradiating the optical disc 110 with recording pulses (not shown) based on the recording data from the pickups 801a and 801b.

  3 differs from the configuration of the drives 104 to 107 shown in FIG. 3 in that the recording data from the host server 109 is transmitted in time division to either the controller 805a or the controller 805b via the second host I / F, and at the same time the optical disk 110. Is recorded on both sides. When playing back a disc on which data is recorded in a time-sharing manner on both sides of the disc, both sides need to be played back simultaneously. That is, data is recorded or reproduced simultaneously on both sides of the optical disc 110. In this way, by simultaneously recording or reproducing on both sides of the disc, it is theoretically possible to realize a double transfer rate compared to the optical disc 101 having a recording layer only on one side. Since the double-sided optical disc 110 is configured with a forward spiral (see FIG. 4) on one side and a reverse spiral (not shown) on the other side, simultaneous recording / reproduction is possible.

  The information recording / reproducing apparatus 700 shown in FIG. 7 has a configuration including four drives, but the number of drives is not limited to this. The information recording / reproducing apparatus 700 may include three or less or five or more drives.

2.2 Failure Prevention Diagnosis Processing Also for the information recording / reproducing apparatus 700 corresponding to the double-sided optical disc of this embodiment, the failure prevention diagnosis processing described in Embodiment 1 and the failure prevention diagnosis in consideration of drive reproduction performance Processing can be applied as well. Since these processes have already been described, a description thereof is omitted here.

  Hereinafter, failure prevention diagnosis processing based on error rates measured from both sides of the double-sided optical disc 110 will be described with reference to the flowchart of FIG.

  In the failure prevention diagnosis process, first, the controller 111 of the host server 109 takes out the optical disk 110 to be diagnosed from the magazine 103 and loads it into the drive to be diagnosed (here, referred to as drive 704). A command is transmitted to (S51). Upon receiving this command, the mechanical control unit 102 of the information recording / reproducing apparatus 700 takes out the instructed optical disk 110 from the magazine 103 and conveys it to the drive 704 to be diagnosed.

  Thereafter, the controller 111 of the host server 109 transmits a command to the information recording / reproducing apparatus 700 so as to measure the error rate of each surface of the optical disc 110 (S52). Upon receiving this command, the controllers 805 a and 805 b of the drive 704 measure the error rate for both surfaces of the optical disc 110 and transmit the measurement result to the host server 109.

  The controller 111 of the host server 109 makes a failure determination based on the error rate measurement result received from the drive 704 as follows.

  A double-sided optical disc is formed of the same recording material on both sides, and data is recorded simultaneously on both sides. For this reason, in a double-sided optical disc, it is considered that the deterioration of the recording quality due to aging degradation of the recording film due to long-term storage of the optical disc proceeds simultaneously on both sides. For this reason, the controller 111 of the host server 109 determines that there is a possibility of failure in the optical disk 110 (S56) when both of the error rates measured on both sides of the optical disk exceed the criteria (YES in S53). . On the other hand, if the error rate measured on one side is equal to or higher than the criterion (YES in S54), it is determined that there is a possibility of failure in the drive 704 (S57). At this time, it is further determined in the drive 704 that there is a possibility of failure in the components (pickup, traverse mechanism, controller, etc.) on the disk surface side for which the error rate is determined to be higher than the criteria. If both error rates measured on both sides are below the criteria (NO in S54), it is determined that both the optical disc 110 and the drive 704 have a low possibility of failure (S55).

  In this way, failure determination can be performed on the double-sided optical disk and the drive corresponding to the double-sided optical disk. By performing the above-described failure determination process for each drive, the failure determination of the entire information recording / reproducing apparatus 700 can be performed.

(Embodiment 3)
The configuration of the information recording / reproducing apparatus in the present embodiment is the same as that described in the second embodiment, and is an information recording / reproducing apparatus capable of recording / reproducing data on both sides of the disc with respect to the double-sided type optical disc. The same applies to modes 4 and 5.)

  The present embodiment discloses a configuration for realizing high-speed access while maintaining recording / reproduction quality (while ensuring reliability of recording / reproduction) in consideration of a control residual in servo control for an optical disc.

  In general, in the manufacturing process of an optical disc, variations in the height direction and width direction of a recording track occur. The variation in the height direction of the recording track causes a focus error when the recording track is irradiated with the laser beam, and deteriorates the recording / reproducing quality. Further, the variation in the width direction of the recording track causes a tracking error when the recording track is irradiated with the laser beam, and deteriorates the recording / reproducing quality. For these two variations, servo control is performed to reduce the variation, but a control residual remains depending on the variation frequency. Here, the control residual is a deviation amount between the actually controlled amount and the target value. When the control residual is large, not only the recording / reproducing quality is deteriorated but also the servo control may be broken. That is, due to the control residual, servo control during recording / reproduction may fail, and the recording / reproducing operation may not be performed normally.

  The variation of the recording track that occurs in the manufacturing process of such an optical disk increases as it goes to the outer periphery of the optical disk. For this reason, as shown in FIG. 10A, the control residual caused by the variation in the recording track increases as the radius increases at the outer periphery of the optical disc. Therefore, in this embodiment, the control residual is measured for the optical disc area, and the optical disc area that gives an allowable control residual is the outer peripheral position of the area, that is, the radius (hereinafter referred to as “boundary radius”). It shows with.

  Specifically, the outer peripheral position of a region where the control residual is equal to or less than a predetermined criterion in the optical disc (a region where the control residual is within an allowable range) is set as the boundary radius. Here, the control residual is measured for both the focus operation and the tracking operation, and the region where the control residual is below the criterion for both operations is defined as a region having an allowable control residual in the optical disc.

  The area inside the boundary radius is recorded / reproduced at a high speed (for example, 10 times speed), and the area outside the boundary radius is recorded / reproduced at a low speed (for example, 5 times speed). For example, in the example shown in FIG. 10 (A), when the boundary radius is set to 57.4 mm, as shown in FIG. 10 (B), on the inner peripheral side of the boundary radius (57.4 mm), a high speed ( For example, recording and reproduction are performed at 10 times speed, and recording and reproduction are performed at a low speed (for example, 5 times speed) on the outer peripheral side of the boundary radius.

(1) Specification value of boundary radius of optical disk For the boundary radius, a specification value to be satisfied by each optical disk is defined in advance, the boundary radius is measured for each disk at the time of shipment, and only an optical disk that satisfies the specifications is shipped. May be. In this case, the measurement of the boundary radius may be performed for all manufactured disks or may be performed for some lots. In the case of a double-sided optical disk, only the optical disk that satisfies the specifications on both sides is shipped.

  For example, the specification value of the boundary radius is set to 57.4 mm (see FIG. 10A), and only the optical disc satisfying this specification is shipped. In an optical disk that satisfies this specification, the control residual is below the criteria in the area within the radius of 57.4 mm.

(2) Recording information indicating the minimum boundary radius satisfying the specification value on the optical disk During the optical disk manufacturing process, the control residual is measured on both sides of the disk to determine the boundary radius, and information indicating the smaller boundary radius is obtained. You may record on BCA (Burst Cutting Area). For example, when the control residual satisfies the criteria within a radius of 57.8 mm for one surface of the optical disk and the control residual satisfies the criteria within a radius of 57.4 mm for the other surface, the smaller radius 57 .4 mm is the boundary radius of the optical disk. The measurement of the boundary radius may be performed for all the media, or may be performed by sampling for each lot. The drives 704 to 707 of the information recording / reproducing apparatus 700 can recognize the boundary radius unique to the disc by referring to the BCA of the optical disc. Moreover, ID etc. for identifying a manufacturer in BCA may be recorded in advance, and the drive may determine the radius based on the ID. For example, when the ID indicates Company A, the boundary radius may be 57.0 mm, and when the ID indicates Company B, the boundary radius may be 57.6 mm. Further, the recording location of the ID for identifying the manufacturer is not limited to the BCA. As long as the ID can be recorded in advance on the disc, the ID may be recorded in any manner.

(3) Measuring the boundary radius of the disc when the optical disc is inserted into the drive The control residual may be measured when the optical disc is inserted into the drive, and the boundary radius may be defined for each disc based on the measured control residual. When the radius satisfying the criteria is different on both sides of the optical disc, the smaller value is set as the boundary radius of the disc.

  The area inside the boundary radius is recorded and reproduced at high speed, and the area outside the boundary radius is recorded and reproduced at low speed. By switching the recording speed and playback speed with the boundary radius as the boundary in this way, failure of recording and playback can be avoided in advance, and both maximum transfer rate and prevention of failure can be achieved. It becomes possible to improve the property.

  Processing for obtaining the boundary radius of the optical disc will be described with reference to the flowchart of FIG. 11A. The controller 111 of the host server 109 transmits a command to the information recording / reproducing apparatus 700 to load a predetermined double-sided optical disk 110 into a predetermined drive among the drives 704 to 707 (S61). In response to this command, the optical disk 110 is loaded into a predetermined drive among the drives 704 to 707.

  Next, the controller 111 of the host server 109 transmits a command to the information recording / reproducing apparatus 700 to measure the control residual and the boundary radius for each surface of the optical disc 110 via the second interface (S62). ). Controllers 805a and 805b of a predetermined drive perform servo control on each surface and measure a control residual for each track. Further, the controllers 805a and 805b obtain a boundary (that is, a boundary radius) between a region where the control residual exceeds the criterion and a region where the control residual does not exceed based on the measured control residual, and transmits the boundary to the host server 109. The controller 111 of the host server 109 determines the boundary radius for the optical disk 110 based on the received boundary radius for each surface, and stores it in the memory 113 (S63).

  The process of obtaining the boundary radius of the optical disk 110 shown in FIG. 11A need only be performed once when the optical disk 110 is first inserted into any of the drives 704 to 707. The value of the boundary radius measured at that time may be stored in the host server 109 or may be recorded on the optical disk 110. Or you may memorize | store in memory 806a, 806b in the drives 704-707.

  FIG. 11B is a flowchart showing a recording speed setting process according to the recording position of the optical disc 110. The processing shown in FIG. 11B is executed by the controller 805a of the drives 704 to 707 of the information recording / reproducing apparatus 700 in response to a data recording or reproducing command from the host server 109.

  The controller 805a determines whether or not the position on the disk where data is to be recorded is in an area outside the boundary radius (S65). The information on the boundary radius may be provided from the host server 109, or may be obtained by reading from the optical disc 110 if it is recorded on the optical disc 110, or stored in the memory in the drives 704 to 707. If it is, it may be obtained by reading from the memory. When the recording position is in an area inside the position of the boundary radius, the controller 805a controls the motor 803 and sets the recording speed to a high speed (for example, 10 times speed) (S66). On the other hand, when the recording position is in an area outside the boundary radius, the controller 805a sets the recording speed to a low speed (for example, 5 × speed) (S68). The above processing is performed until the recording operation is completed (S67).

  In the flowchart of FIG. 11B, the recording speed switching process during the recording operation has been described for the sake of convenience of explanation. Similarly, the reproduction speed is switched using the boundary radius as a boundary during reproduction. That is, data is reproduced at a high speed (for example, 10 times speed) for an area having a small control residual inside the boundary radius position, and for an area having a large control residual outside the boundary radius position. Data reproduction is performed at a low speed (for example, 5 times speed).

  As described above, by switching the data access speed based on the boundary radius, high-speed data access can be realized for the inner region where the servo residual is relatively low, and the servo residual is reduced. The reliability of data recording or data reproduction can be ensured by accessing data at a low speed in the relatively high outer area.

  Furthermore, in the configuration in which the access speed is switched based on the boundary radius as described above, the user data area 405-2 is set inside the boundary radius position with the boundary radius position as the boundary, as shown in FIG. A replacement area (OSA (405-3)) for user data may be set outside the radial position. The replacement area is an area used for alternative recording of data recorded in the defect area in the user data area 405-2, and is included in the OSA (405-3).

  For example, in the example shown in FIG. 12, the area inside the boundary radius (57.4 mm) position is set as the user data area 405-2, and the area outside the boundary radius (57.4 mm) position is set as the user. It is set in the data replacement area (OSA (405-3)).

  The user data is preferably recorded at a transfer rate as high as possible. For this reason, the user data area 405-2 in which user data is recorded is an area that can be recorded at high speed. On the other hand, the replacement area is recorded at a low speed so that high reliability is required, so that priority is given to reliability over recording speed, and the servo residual is suppressed to achieve an error rate below a predetermined value. Set the area. As a result, high-speed data recording can be achieved and reliability can be ensured.

  Since the access speed (linear speed) for the optical disk is determined by the product of the rotational speed and the radius of the motor, the maximum value of the access speed that can be realized by the rotation of the motor varies depending on the radial position at which data is accessed. That is, the maximum speed (linear velocity) that the motor can achieve becomes smaller as the position closer to the center of the optical disk is accessed. For this reason, when the recording position is close to the center of the disc, a desired high speed (10 × speed) may not be realized. Therefore, the drives 704 to 707 actually perform access speed control as shown in FIG.

  In FIG. 13, the upper limit of the motor rotation speed is about 8000 rpm and the control for the motor 803 capable of realizing 10-times speed at a position where the radius is about 37 mm is described.

  The controller 805a of the drives 704 to 707 drives the motor 803 at the upper limit of the rotational speed until a high access speed (10 times speed) is obtained, and when the access speed reaches the high access speed, Maintain rotation speed. Then, when the access position reaches the boundary radius, the controller 805a controls the rotation speed of the motor 803 so as to reduce the access speed to a low speed (5-times speed). In the example shown in FIG. 13, the motor 803 is driven at the upper limit of the number of rotations in a region having a radius inside about 37 mm (motor rotation number restriction region). When the recording position reaches a position with a radius of about 37 mm and the recording speed reaches a high access speed (10 times speed), the controller 805a controls the rotation speed of the motor 803 to fix the access speed. Thereafter, when the access position enters an area outside the boundary radius (57.4 mm), the access speed is limited to a low access speed (5 × speed). If the motor 803 can be driven at a sufficiently high rotational speed even on the inner circumference, the motor rotational speed restriction region may not be provided.

  As described above, the information recording / reproducing apparatus 700 of this embodiment is an information recording / reproducing apparatus that records or reproduces data on the optical disc 110. The information recording / reproducing apparatus 700 includes drives 704 to 707 that record information on the optical disc 110 using laser light, and controllers 805a and 805b that control the drives 704 to 707.

  The controllers 805a and 805b divide the recording area of the optical disc 110 into an area on the inner circumference side (an example of a first recording area) with a boundary radius (an example of a predetermined radius) in the radial direction of the optical disc 110 as a boundary and an outer circumference side. It is divided into a certain area (an example of the second recording area) and managed. The controllers 805a and 805b record and reproduce data at the first speed (for example, 10 times speed) for the inner peripheral area, and the second speed slower than the first speed for the outer area. The drives 704 to 707 (motor 803) are controlled so as to record data at a speed (for example, 5 times speed).

  The boundary radius is set to a boundary between a region where the control residual when the servo control related to the tracking and focusing operations is performed on the recording region of the optical disc 110 exceeds the criterion (predetermined reference value) and a region where the control residual does not exceed. (See FIG. 10).

  As described above, by switching the access speed based on the boundary radius set based on the control residual, an area where the possibility of recording / reproduction failure is low is accessed at high speed, and the processing time is shortened. On the other hand, the possibility of access failure is reduced by accessing an area where recording / reproduction failure is likely to occur at a low speed. Thereby, the reliability of recording / reproducing can be improved while realizing a high-speed recording / reproducing operation.

(Embodiment 4)
As the speed of information recording / reproducing apparatuses for optical disks increases, track position fluctuations synchronized with disk rotation, such as optical disk eccentricity and surface wobbling, are increasing, and development of optical disk apparatuses capable of following these fluctuations has been developed. It was desired. However, since the servo signal has a characteristic that the amplitude remains as it is and the frequency only increases as the rotational speed of the disk increases, a higher loop gain is required to maintain the servo residual below a specified value. On the other hand, raising the loop gain is limited due to constraints such as secondary resonance of the pickup, and as a result, there has been a problem of deterioration in tracking performance. Therefore, repeated memory control in servo control has been developed as a technique for ensuring the following performance (see, for example, JP 2009-170102 A and JP 9-50303 A).

  The iterative memory control is a control method for reducing the residual by using the feature that the residual in the adjacent region is generated almost similarly. In repeated memory control, the control residual in servo control is stored in the memory while moving the pickup, and the servo control for the track to be accessed is performed using the control residual stored in the memory for the track adjacent to the track to be accessed. Do. As a result, the control residual that can occur can be reduced, and the change in the track position is canceled.

  In the present embodiment, a description will be given of a control for improving the reliability at the time of recording and reproducing data by effectively utilizing such repeated memory control. In particular, the operation when data is recorded / reproduced in / from an area where the control residual on the outer periphery of the optical disc 110 is large (area outside the boundary radius position) will be described.

  Specifically, when an instruction for access (recording / playback) to an area with a large control residual (area outside the boundary radius position) is received from the host server 109, as shown in FIG. Move the pickup to a radial position. Thereafter, the control residual is stored in the memory while causing the pickup to track jump from the boundary radius position to the target area. When the pickup reaches the target area, data access is started while performing memory control repeatedly using the control residual stored in the memory.

  FIG. 15 is a flowchart showing drive control when data access (recording and reproduction) is started from an area having a large control residual (an area outside the boundary radius position) in this embodiment.

  The controllers 805a and 805b of the drives 704 to 707 receive an instruction from the host server 109 for data access (recording and reproduction) to a target area in an area having a large control residual (an area outside the boundary radius position). Then, the traverse mechanisms 802a and 802b are controlled, and the pickups 801a and 801b are traversed to the boundary radius position (S71).

  Thereafter, the controllers 805a and 805b move the pickups 801a and 801b to the target area by track jump (S72 and S73). During the track jump movement, the controllers 805a and 805b repeatedly perform memory control, but do not record or reproduce data.

  When the pickups 801a and 801b reach the target area, the controllers 805a and 805b start data access (recording and reproduction) (S74).

  As described above, the information recording / reproducing apparatus 700 of this embodiment includes the pickups 801a and 801b that irradiate laser light, and drives 704 to 707 (recording / reproducing) that record or reproduce information by irradiating the optical disk 110 with laser light. Unit) and controllers 805a and 805b for controlling the drive.

  The controllers 805a and 805b divide the recording area of the optical disc 110 into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with the boundary radius in the radial direction of the optical disc as a boundary. to manage. The boundary radius is set at the end of an area where the control residual in servo control related to focus and tracking is below a predetermined criterion with respect to the recording area of the optical disc.

  When recording or reproducing data from the target position in the second area, the controllers 805a and 805b traverse the pickups 801a and 801b to the innermost peripheral position of the second recording area, and then move the pickups 801a and 801b to While moving the servo control, the control residual in the servo control is stored in the memories 806a and 806b (an example of storage means) (see FIG. 14). When the pickups 801a and 801b reach the target position, servo control is performed using the control residual stored in the memories 806a and 806b (repetitive memory control), and recording or reproduction of data from the target position is started. .

  In this way, when accessing a region having a large residual (outside the boundary radius position), the pickup is moved to the outermost periphery (boundary radius position) of the region having a small residual and then moved to the target position by track jump. . Since the control residual information is stored in the memory by performing the track jump, the memory control can be repeatedly performed from the target position, and the servo control with high accuracy can be performed. As a result, highly reliable access can be realized. The access includes operations such as seeking in addition to recording and reproduction.

(Embodiment 5)
In the present embodiment, a method different from that of the fourth embodiment in the use of repeated memory control will be described.

  Specifically, when an instruction for access (recording and reproduction) to an area with a large control residual (an area outside the boundary radius position) is received from the host server 109, as shown in FIG. After reducing the rotational speed of 803, the pickup is traversed to the target area. Thereafter, servo control is performed without moving the track while gradually increasing the number of rotations of the motor, and control residuals are stored in the memories 806a and 806b. Thereafter, when the rotational speed of the motor 803 reaches a predetermined rotational speed, data access is started while repeatedly performing memory control using the control residual stored in the memories 806a and 806b.

  FIG. 17 is a flowchart showing drive control when data access (recording and reproduction) is started from an area having a large control residual (an area outside the boundary radius position) in this embodiment.

  The controller 805a controls the motor 803 when receiving an instruction for data access (recording / reproduction) to a target area in an area having a large control residual (an area outside the boundary radius position) from the host server 109. Then, the motor rotational speed is reduced to the first predetermined rotational speed (the rotational speed lower than the rotational speed that realizes the 5-times speed) (S81). Thereafter, the controllers 805a and 805b control the traverse mechanisms 802a and 802b to traverse the pickups 801a and 801b to the target area (S82). After the movement, the controller 805a gradually increases the rotational speed of the motor 803 until the motor 803 reaches the second predetermined rotational speed (the rotational speed that realizes the 5-times speed) (S83, S84). At this time, the controllers 805a and 805b do not record information, and increase the rotational speed while holding jump (without moving the track). While increasing the rotational speed, the control residual is measured for the same track and held in the memories 806a and 806b. Thereafter, when the motor rotation speed reaches a predetermined rotation speed (rotation speed that achieves 5 × speed), the controller 805a starts recording data from the target position (S85). Note that, as described above, an area where the control residual is small (area inside the boundary radius position) is accessed at a high speed (10 times speed).

  As described above, in the information recording / reproducing apparatus 700 of this embodiment, the controllers 805a and 805b rotate the optical disc 110 when recording or reproducing data from the target position in the second area on the outer peripheral side of the boundary radius. Then, the pickups 801a and 801b are traversed to the target position. The controllers 805a and 805b servo-control the pickups 801a and 801b while increasing the number of rotations of the optical disk 110 in the traversed area, and store control residuals in the servo control in the memories 806a and 806b (an example of storage means). I will remember it. Thereafter, when the rotational speed of the optical disk 110 reaches a predetermined rotational speed, servo control is performed using the control residual stored in the memory (repetitive memory control), and recording or reproduction of data from the target position is started.

  In this way, when accessing a target position in an area where the control residual is large (area outside the boundary radius position), the rotational speed is set so that the influence of the control residual is reduced before moving to the target position. After the rotational speed is decreased, the pickups 801a and 801b are moved to the target area. Then, the rotational speed is gradually increased in that region. By reducing the rotational speed, servo control can be performed even in a region where the control residual is large, and the control residual used for repeated memory control can be accumulated. When the control residual information is accumulated, it is possible to perform repeated memory control using the control residual information, thereby reducing the control residual. As a result, it becomes possible to stably access the optical disc, and the reliability is improved.

(Other embodiments)
As described above, Embodiments 1 to 5 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1-5, and it can also be set as a new embodiment. Therefore, other embodiments will be exemplified below.

  In the above embodiment, the controllers 305, 805a, and 805b in the information recording / reproducing apparatuses 100 and 700 are illustrated as examples of the control unit. These controllers 305, 805a, and 805b can be realized by a semiconductor integrated circuit such as an IC, LSI, or VLSI. The function may be realized by combining software and hardware, or may be realized only by hardware (electronic circuit). Such a controller can be realized by a microcomputer, CPU, MPU, DSP, ASIC, FPGA or the like. The same applies to the controller 111 in the host server 109.

  In the above embodiment, the optical disk is a write-once type recording medium, but the optical disk may be rewritable.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The information recording / reproducing apparatus according to the present disclosure can perform recording and reproduction of data with respect to an optical disc with high reliability. Therefore, the information recording / reproducing apparatus according to the present disclosure is useful in the field of archive storage that stores data with high reliability for a long period of time.

100, 700 Information recording / reproducing apparatus 101, 110 Optical disk 102 Mechanical control unit 103 Magazine 104-107, 704-707 Drive 108, 708 Tray 109 Host server 111, 305, 805a, 805b Controller 113, 306, 806a, 806b Non-volatile memory 301, 801a, 801b Pickup 302, 802a, 802b Traverse mechanism 303, 803 Spindle motor 304, 804 Magnet 402 Track 403 Block 404 Inner peripheral area 404-1 BCA
404-2 Drive area 404-3 Management information area 405 Data area 405-1 ISA
405-2 User data area 405-3 OSA
406 Peripheral area

Claims (7)

An information recording / reproducing apparatus for recording or reproducing data on an optical disc,
A recording / reproducing unit for recording or reproducing data on the optical disc using a laser beam;
A control unit for controlling the recording / reproducing unit,
The controller is
The recording area of the optical disc is divided and managed into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with a predetermined radius in the radial direction of the optical disc as a boundary,
Data is recorded or reproduced at a first speed for the first recording area, and data is recorded or reproduced at a second speed slower than the first speed for the second recording area. To control the recording / playback unit,
The predetermined radius is set at a boundary between an area in which a control residual when a servo control related to focus and tracking is performed on a recording area of the optical disc exceeds a predetermined reference value, and an area that does not exceed the predetermined reference value.
Information recording / reproducing apparatus. The first recording area is an area where user data is recorded;
The second recording area includes a replacement area in which data for replacing user data recorded in the first recording area is recorded.
The information recording / reproducing apparatus according to claim 1.   The information recording / reproducing apparatus according to claim 1, wherein the control unit performs servo control related to focusing and tracking on a recording area of the optical disc, and obtains the predetermined radius based on a control residual in the servo control. The optical disc has a recording area on both the first surface and the second surface,
The controller is configured to divide and manage a recording area into the first recording area and the second recording area on each of the first and second surfaces of the optical disc. A predetermined radius and the predetermined radius in the second surface are set to the same value;
The information recording / reproducing apparatus according to claim 1.   5. The information recording / reproducing apparatus according to claim 1, wherein information indicating the predetermined radius is recorded on the optical disc. An information recording / reproducing apparatus for recording or reproducing data on an optical disc,
A recording / reproducing unit that includes a pickup that irradiates a laser beam, and records or reproduces information by irradiating the optical disc with the laser beam;
A control unit for controlling the recording / reproducing unit,
The control unit manages the recording area of the optical disc by dividing it into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with a predetermined radius as a boundary in the radial direction of the optical disc. And
The predetermined radius is set at an end of an area where a control residual in servo control related to focus and tracking is equal to or less than a predetermined reference value with respect to the recording area of the optical disc,
When the controller records or reproduces data from a target position in the second recording area,
Traverse the pickup to the innermost position of the second recording area;
After traverse movement, the pickup is moved while being servo-controlled, and the control residual in the servo control is stored in the storage means,
When the pickup reaches the target position, servo control is performed using the control residual stored in the storage means, and recording or reproduction of data from the target position is started.
Information recording / reproducing apparatus. An information recording / reproducing apparatus for recording or reproducing data on an optical disc,
A recording / reproducing unit that includes a pickup that irradiates a laser beam, and records or reproduces information by irradiating the optical disc with the laser beam;
A control unit for controlling the recording / reproducing unit,
The control unit divides the recording area of the optical disc into a first recording area on the inner peripheral side and a second recording area on the outer peripheral side with a predetermined radius as a boundary in the radial direction of the optical disc. Manage,
The predetermined radius is set at an end of an area where a control residual in servo control related to focus and tracking is equal to or less than a predetermined reference value with respect to the recording area of the optical disc,
When the controller records or reproduces data from a target position in the second recording area,
Reducing the rotational speed of the optical disc,
Traverse the pickup to the target position,
Servo-controlling the pickup while increasing the number of rotations of the optical disc in the traverse-moved area and storing the control residual in the servo control in the storage means,
When the number of rotations of the optical disk reaches a predetermined number of rotations, servo control is performed using the control residual stored in the storage unit, and recording or reproduction of data from the target position is started.
Information recording / reproducing apparatus.

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