JP6026803B2 - Optical disc management system - Google Patents

Description

  The present invention relates to an optical disc management system.

  In recent years, a system for long-term storage of data recorded on an optical disc has been proposed. For long-term storage, it is recommended that the recorded optical disk be regularly inspected to confirm the recording quality. Migration (data migration) is required when it is determined that the recording quality has deteriorated to a predetermined level or less and is not suitable for future storage.

  Patent Document 1 below measures the error rate when data is reproduced from an optical disc, and when the error rate exceeds a predetermined threshold per unit time, determines the deterioration of the optical disc and gives an instruction to back up the disc. Is output.

  Patent Document 2 also monitors the jitter value, the jitter value variation, the block error rate, and the block error rate at a specific position during reproduction of the optical disc, and any one of the values exceeds the warning reference value. If it is determined that the recording data of the optical disk should be backed up in the near future, a warning message is displayed, and if it is determined that any one of the values exceeds the limit reference value, Describes that an urgent message for informing the user to take a backup of the recorded data on the optical disk is displayed.

JP 2006-164332 A JP 2007-149161 A

  By the way, when performing periodic inspection of an optical disk, first, the data (archive data) recorded on the optical disk is stored in an external storage device such as a PC as backup data, and then the recording quality of the archive data recorded on the optical disk It is conceivable to measure the error rate to confirm the error, but it takes a certain time, for example, about 10 minutes to read (read) the archive data of the optical disc, and further to measure the error rate of the archive data. Since a certain amount of time is required, there is a problem that time is required for periodic inspection. In particular, in areas where a large amount of data needs to be stored for a long period of time, such as government offices, schools, hospitals, companies, etc., it takes a lot of time for regular inspection work, making it difficult to manage optical discs Occurs.

  An object of the present invention is to provide a system capable of efficiently executing management of an optical disc for checking the recording quality of data (archive data) recorded on the optical disc and performing migration as necessary. .

  The optical disk management system of the present invention includes means for reading data from an optical disk, means for generating backup data from the read data, means for measuring the error rate, means for storing the backup data, and storing the error rate. The error rate is compared with a predetermined threshold value, and if it is equal to or lower than the threshold value, the recording quality is regarded as good and an inspection result file including the error rate is additionally recorded on the optical disc. The backup data is recorded on another optical disk different from the optical disk on the assumption that the quality is not good.

  In one embodiment of the present invention, the recording unit additionally records an inspection result file including the error rate of the backup data on the another optical disk when the error rate exceeds the threshold. And

  Further, in another embodiment of the present invention, the apparatus further comprises means for forming at least a part of the inspection result on a label surface of the optical disc in any one of a barcode, an IC tag format, and a metadata format. To do.

  According to the present invention, the process can be executed at high speed by simultaneously executing the process of generating backup data from the read data and the process of measuring the error rate. Thereby, the management time of the optical disk can be shortened regardless of the presence or absence of migration.

It is a system configuration figure of an embodiment. It is a conventional process flowchart. It is a flowchart of an embodiment. It is a schematic diagram which shows the process in the case of no migration. It is a schematic diagram which shows the process in case there exists migration. It is a system configuration figure of other embodiments. It is a flowchart of other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration block diagram of an optical disc management system according to the present embodiment. The optical disk management system includes an optical pickup 12, an RF generation circuit 14, a binarization circuit 16, a decoding circuit 18, an optical disk device 21 including an error correction circuit 20, and a host PC 22. The optical disk management system may be a system that connects the optical disk device 21 and the host PC 22 through an interface, or may be a system that integrally configures the optical disk device 21 and the host PC 22.

  The optical pickup 12 includes a laser diode (LD) for irradiating the optical disk 10 with laser light and a photodetector (PD) that receives reflected light from the optical disk 10 and converts it into an electrical signal, and is disposed opposite to the optical disk 10. . The optical pickup 12 is driven in the radial direction of the optical disc 10 by a thread motor. The LD of the optical pickup 12 is driven by a driver, and the driver is controlled by an auto power control circuit (APC) so that the emission power of the LD becomes a desired value. When reading (reading) the data recorded on the optical disk 10, a laser beam of reproduction power is irradiated from the LD of the optical pickup 12, and the reflected light is converted into an electrical signal by the PD and output. A reproduction signal from the optical pickup 12 is supplied to the RF generation circuit 14.

  The RF generation circuit 14 generates a focus error signal and a tracking error signal from the reproduction signal and outputs them to a servo processor (not shown). The servo processor servo-controls the optical pickup 12 based on these error signals, and maintains the optical pickup 12 in an on-focus state and an on-track state. Further, the RF generation circuit 14 outputs an address signal included in the reproduction signal to an address decoding circuit (not shown). The address signal is, for example, a wobble signal, and address data is obtained by extracting the wobble signal from the reproduction signal and decoding it. Further, the RF generation circuit 14 outputs the reproduction RF signal to the binarization circuit 16.

  The binarization circuit 16 binarizes the reproduction signal and outputs the obtained signal to the decoding circuit 18.

  The decode circuit 18 demodulates the binary signal and outputs it to the error correction circuit 20.

  The error correction circuit 20 corrects an error in the demodulated signal to obtain reproduction data, and outputs the reproduction data to a host device such as a PC (personal computer) 22. The error correction circuit 20 measures an error rate when correcting an error in the demodulated signal, and outputs the measured error rate to the host PC 22. A circuit for measuring the error rate may be provided separately from the error correction circuit.

  The host PC 22 stores the error-corrected reproduction data output from the error correction circuit 20 in the storage device as backup data. The host PC 22 also stores the error rate output from the error correction circuit 20 in the storage device, and evaluates the recording quality of the archive data recorded on the optical disc 10 based on this error rate. Then, it is determined whether or not to migrate the archive data based on the evaluation result, and is output as a control signal. Specifically, when it is determined that the error rate is equal to or less than a predetermined threshold and the recording quality is good, it is determined that migration is not performed, and a control signal is output so that the inspection result is recorded as a log on the optical disc 10. On the other hand, if it is determined that the recording quality is poor because the error rate exceeds a predetermined threshold value, it is determined that migration is performed, and a control signal is sent so that the archive data of the optical disk 10 is recorded on a new optical disk using the backup data. Output.

  There are several types of error rates. For example, PI error (Inner-Code Parity Error) can be used. One ECC block (user data: 32 kB) has 208 PI rows including an error correction code, and one row of PI has 182 bytes including an error correction code. A PI error relates to a random error. When there is one 1-byte error in a line, it is counted as one PI error. PI errors are counted for 8 consecutive ECC blocks (eg, for DVD-R).

  The determination process using the error rate in the host PC 22 is executed as a regular inspection at a predetermined interval, for example, every five years. That is, the optical disk 10 is inspected by the optical disk management system every five years from the start of recording, archive data is stored as backup data in the host PC 22, and migration is executed when necessary.

  Means for recording the inspection result as a log on the optical disc 10 and means for recording backup data on a new optical disc for executing migration include an encoding circuit 24 for recording data on the optical disc, etc. Known means can be used. The host PC 22 outputs a control signal to the encoding circuit 24, and outputs inspection results and backup data to the encoding circuit 24. The encoding circuit 24 modulates these data and outputs the data to the optical pickup 12 to record the data. .

  FIG. 2 shows a process flowchart of a conventional periodic inspection, which is a premise for the periodic inspection in the present embodiment.

  First, the host PC 22 reads the archive data on the optical disc 10 to create backup data, and stores it in the storage device (S101).

  Next, the host PC 22 reads the archive data of the optical disc again and measures the error rate. That is, the error rate is measured by the error correction circuit 20, and the measured error rate is acquired (S102).

  Next, the host PC 22 creates a test result file including the error rate value and stores it in the storage device (S103). That is, the backup data and the inspection result file are recorded in the storage device of the host PC 22.

  Next, the CPU of the host PC 22 compares the error rate with a predetermined threshold value and determines whether or not the inspection result is good (S104). If the error rate is equal to or less than the threshold value, it is determined that the inspection result is good, and if the error rate exceeds the threshold value, the inspection result is determined not to be good (deterioration). When a PI error is used as the error rate, the threshold is set to 280, for example.

  When the error rate is equal to or lower than the threshold value and the inspection result is determined to be good, the host PC 22 records the inspection result file in the next session of the optical disc 10, that is, the session next to the session in which archive data is recorded ( S105). On the other hand, when it is determined that the inspection result is not good because the error rate exceeds the threshold, the host PC 22 records the backup data stored in the storage device on a new optical disk. In addition, a test result file including the error rate of the newly recorded backup data is also recorded (S106).

  After recording the inspection result file in the next session of the optical disc 10 in S105 or recording the backup data and the inspection result file in a new optical disc in S106, the host PC 22 can read the archive data and the inspection result file normally. Whether or not is checked, the process is terminated (S107).

  The periodic inspection is completed through the above processing. In order to measure the error rate by reading the archive data in the processing of S101 and creating the backup data and further reading the archive data in the processing of S102. There is a problem that takes time. In particular, as the amount of archive data increases, such as government offices and hospitals, the time required for the processing of S101 and the processing of S102 increases in proportion to the amount of data. It becomes difficult.

  Therefore, in the present embodiment, the processing in S101 and the processing in S102 are executed in parallel in order to shorten the inspection time and efficiently advance the periodic inspection.

  FIG. 3 shows a process flowchart of the periodic inspection in the present embodiment.

  First, when the host PC 22 reads the archive data of the optical disc 10 to create backup data, the host PC 22 simultaneously measures the error rate and stores both the backup data and the error rate in the storage device (S201).

  That is, conventionally, the read reproduction data is error-corrected by the error correction circuit 20 to create backup data, and the error rate of the read reproduction data read thereafter is measured. In this embodiment, the read reproduction data is read. The data is error-corrected by the error correction circuit 20 and the error rate is measured, and the backup data and the error rate are simultaneously generated and stored in the storage device. It should be noted that in the process of S201, the error rate of the archive data is generated simultaneously with the backup data of the archive data, not simply reproducing the data and measuring the error rate. Therefore, as a matter of course, the error correction capability when generating the backup data and the error correction capability when measuring the error rate are the same.

  Next, the host PC 22 creates a test result file including the error rate value and stores it in the storage device (S202). That is, the backup data and the inspection result file are recorded in the storage device of the host PC 22. More specifically, the inspection result file includes inspection date data, ID data for specifying the inspected optical disc management system, ID data for specifying the inspection user, and an error rate value. The data of the inspection result file is not limited to this, and may include any data selectively.

  Next, the CPU of the host PC 22 compares the error rate with a predetermined threshold value and determines whether or not the inspection result is good (S203). If the error rate is equal to or less than the threshold value, it is determined that the inspection result is good, and if the error rate exceeds the threshold value, the inspection result is determined not to be good (deterioration). When a PI error is used as the error rate, the threshold value is set to 280, for example, but it is also preferable to appropriately adjust the threshold value according to the type of the optical disc 10 and the purpose of periodic inspection.

  When the error rate is equal to or lower than the threshold value and the inspection result is determined to be good, the host PC 22 records the inspection result file in the next session of the optical disc 10, that is, the session next to the session in which archive data is recorded ( S204). The reason why the inspection result file is recorded on the optical disc 10 is to allow the result of the previous periodic inspection to be referred to in the next periodic inspection. That is, by comparing the result of the next periodic inspection with the result of the previous periodic inspection, the degree of deterioration of the optical disk 10 can be quantitatively grasped. The inspection result file may be recorded in an area outside the user data area such as PCA (Power Calibration Area). On the other hand, when it is determined that the inspection result is not good because the error rate exceeds the threshold, the host PC 22 records the backup data stored in the storage device on a new optical disk. Also, the inspection result file including the error rate of the newly recorded backup data is also recorded (S205).

  After recording the inspection result file in the next session of the optical disk 10 in S204 or recording the backup data and the inspection result file on a new optical disk in S205, the host PC 22 can read the archive data and the inspection result file normally. It is checked whether or not, and the process is terminated (S206). If the data cannot be read normally, the inspection result file is recorded again in the next session, or the archive data and the inspection result file are recorded again on a new optical disk using the backup data stored in the storage device of the host PC 22. .

  As described above, when migration is not necessary, the inspection result file of the periodic inspection is recorded on the optical disc 10 in addition to the original archive data, and when migration is necessary, The archive data and the inspection result file are recorded on a new optical disk different from the optical disk 10. When migration is executed, it is desirable to record information of the migration source optical disk 10 on a new optical disk at the same time. For example, in addition to the inspection date file, the inspection date data, the ID data specifying the inspected optical disc management system, the ID data specifying the inspection user, the error rate value, the fact of migration, the migration source optical disc It is desirable to add information that identifies

  4 and 5 schematically show the processing of this embodiment.

  FIG. 4 shows a case where it is determined that migration is unnecessary because the error rate is equal to or less than the threshold value. The archive data read from the optical disc 10 is stored as backup data 50 in the storage device of the host PC 22 and the archive data The inspection result file 52 including the error rate is also stored in the storage device of the host PC 22. Then, the inspection result file 52 is recorded in a predetermined position on the optical disc 10, that is, a session next to the session in which archive data is recorded. Therefore, after that, when the archive data is read, the inspection result file 52 can be read following the archive data, and the deterioration state of the optical disk 10 can be grasped.

  On the other hand, FIG. 5 shows a case where the error rate exceeds a threshold value and it is determined that migration is necessary. The archive data read from the optical disk 10 is stored as backup data 50 in the storage device of the host PC 22. The inspection result file 52 including the error rate of the archive data is also stored in the storage device of the host PC 22. The backup data 50 is recorded on the new optical disk 11, and the inspection result file 53 obtained by reading this backup data is recorded in the next session of the backup data. When migration is executed, the inspection result file 52 is an inspection result on the migration source optical disk 10 and therefore need not necessarily be recorded on the new optical disk 11 that is the migration destination. However, the inspection result file 52 can be recorded on the optical disk 11 together with the inspection result file 53 as data indicating the deterioration state of the migration source optical disk 10.

  As described above, in the present embodiment, when managing the archive data of the optical disc 10, the backup data of the archive data is created and the error rate of the archive data is simultaneously measured to speed up the processing. Can do. For this reason, even if the archive data is enormous, the processing time can be greatly reduced as compared with the conventional case.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation is possible.

For example, in this embodiment, a PI error is used as the error rate, but any other error rate, for example, a byte error rate (BER) may be used. Byte error is the probability that a random error will cause a 1-byte error. The error rate may be properly used depending on the type of the optical disc 10. In the case of DVD-R, a PI error, in the case of DVD-RAM, a byte error rate, etc. When the byte error rate is used as the error rate, for example, 9 × 10 ⁻⁴ can be used as the predetermined threshold value corresponding to 280 PI errors.

  In the present embodiment, the inspection result file 52 is recorded on the optical disk 10 and the inspection result file 53 is recorded on the optical disk 11. Instead of this, the inspection result file 52 is recorded on the label surface of the optical disks 10 and 11. The metadata can be printed, and the inspection result can be printed in a barcode format by a barcode printer. As a result, the label surface of all optical disks that have undergone periodic inspections show the inspection results, that is, the degree of deterioration, in a barcode format or the like, and management of the optical disks is facilitated. Alternatively, the optical disk management system may be provided with an IC tag creator, and the inspection result may be embedded as an IC tag on the label surface of the optical disks 10 and 11. Such a system is more effective when applied to an automatic disk creation machine such as a disk publishing apparatus.

  In the present embodiment, the error rate is determined by the CPU of the host PC 22, but the error rate may be determined by the microcomputer (CPU) 21 of the optical disc 21 as shown in FIG. In this case, as shown in each process of S301 to S306 in FIG. 7, when the inspection result is good, the inspection result file (stored in the memory 23 of the optical disk device 21) is recorded on the optical disk, and the lead inspection is performed. When the processing is terminated and the inspection result is not good, the inspection result file may be supplied to the host PC 22 to cause the host PC 22 to perform migration.

  10 optical disk, 11 new optical disk, 12 optical pickup, 14 RF generation circuit, 16 binarization circuit, 18 decoding circuit, 20 error correction circuit, 22 host PC, 50 backup data, 52, 53 inspection result file.

Claims (3)

Means for reading data from the optical disc;
A means for generating backup data from the read data and measuring its error rate;
Means for storing the backup data;
Means for storing the error rate;
The error rate is compared with a predetermined threshold value. When the error rate is equal to or lower than the threshold value, the recording quality is regarded as good, and an inspection result file including the error rate is additionally recorded on the optical disk. Means for recording the backup data on another optical disc different from the optical disc,
An optical disc management system comprising: The optical disc management system according to claim 1,
The recording means additionally records an inspection result file including the error rate of the backup data on the another optical disk when the error rate exceeds the threshold value. In the optical disc management system according to claim 1, further comprising:
An optical disc management system comprising: means for forming a part of the inspection result on a label surface of the optical disc in one of a barcode, an IC tag format, and a metadata format.

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