KR20090081522A - Recording medium, method and appratus for verificating recording medium - Google Patents

Abstract

A recording medium, a recording medium verifying method and apparatus are provided to improve efficiency of data migration to another recording medium. A recording medium comprises a data area(200) for recording data, a lead-in area(100) formed in the inner side than the data area, and a lead-out area(300) formed on the outer side than the data area. The lead-in area includes a verification information storage area for storing the result of reliability verification of the recording medium to long term storage.

Description

RECORDING MEDIUM, METHOD AND APPRATUS FOR VERIFICATING RECORDING MEDIUM}

The present invention relates to a recording medium, a method and a verification device for verifying a recording medium. More particularly, the present invention relates to a recording medium for long term storage, a method for verifying reliability of a data stored in a recording medium for long term recording, and a verification device. It is about.

An optical disc is a recording medium that can easily record and store information. However, if the information is stored for a long time, the quality of the optical disc deteriorates with time. Also, as new technologies for recording and reproducing data are developed, it may be impossible to reproduce data recorded on an optical disc according to the existing technology by a general recording and reproducing apparatus to be produced in the future. Therefore, the reliability of the information recorded on the optical disc and stored for a long time cannot be guaranteed, and backup to a new recording medium can also be difficult.

In addition, even if the disk is made by the same manufacturer, the disk quality may be different, and may miss the backup time due to the deterioration of the disk.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to verify the reliability of data stored in a recording medium for a long time, and to enable an efficient migration to a new recording medium during data movement. In addition, the present invention provides a verification method and a verification device for a recording medium.

In order to achieve the above object, the recording medium according to the present invention includes a data area for recording data, and a verification information storage area for storing a result of reliability verification of the recording medium for long-term recording of data in the data area. .

The lead-in area provided on the inner circumferential side of the data area and the lead-out area provided on the outer circumferential side of the data area may be further included, and the verification information storage area may be located in the lead-in area.

The verification information may include information regarding the verification date of the recording medium, the number of verifications, and the reliability level for long term recording.

The verification information may include information on defect management. The verification information may include information on the defect growth rate. The recording medium may further include an area for displaying information indicating that the recording medium is a storage medium for long term storage. The verification information may be recorded in one cluster form.

On the other hand, the verification method of the recording medium according to the present invention comprises the steps of measuring the reliability level for the long-term recording for the recording medium, based on the reliability level measurement result, determining whether or not the backup of the data stored in the recording medium is required And recording verification information related to the reliability level measurement in the verification information storage area provided in the recording medium.

An apparatus for verifying a recording medium according to the present invention includes a pickup for irradiating light to a recording medium to detect a data signal, and measuring reliability for long-term recording from the signal detected by the pickup, and based on the reliability verification result, And a control unit for determining whether to back up the data stored in the storage device and controlling the pickup to record the reliability verification result in the verification information storage area provided in the recording medium.

The recording medium, the method for verifying the recording medium, and the verification apparatus according to the present invention have the effect of confirming the reliability of data stored in the recording medium for a long time and enabling efficient migration to a new recording medium during data movement.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

The terminology used in the present invention was selected as a general term that is widely used at present, but in some cases, the term is arbitrarily selected by the applicant, and in this case, the meaning of the term is described in detail in the description of the present invention. The present invention should be understood as meanings other than terms.

The present invention is applicable to all optical discs such as compact discs (CDs), digital versatile discs (DVDs), blu-ray discs (BDs), high definition DVDs (HD-DVDs), and the like. In the following, an embodiment of the present invention will be described using DVD as an example. The structure of the recording medium described below is for illustrating the present invention, and the present invention is not limited to the structure of the recording medium described below.

1 is a schematic diagram showing a sector structure of an information area of a recordable recording medium according to an embodiment of the present invention. As shown in FIG. 1, a track of a recordable recording medium according to an embodiment of the present invention includes a lead-in area 100, a data area 200, And a lead-out area 300. The physical sector number increases from the lead-in area 100 to the lead-out area 300, that is, toward the outside of the disc. In the data area, user data for long term storage is recorded.

2 shows the structure of the lead-in area 100. As shown in FIG. 2, the lead-in area 100 includes a start area 110, a first buffer area 120, a physical format area 130, and a reference code area 140 arranged in order from the inside of the recording medium. ), A second buffer region 150, a control data region 160, and a boundary region 170.

The main data of the data frame recorded as the physical sector in the start area 110 may be set to 00h, which means blank.

The first buffer region 120 may include 32 ECC blocks and 512 sectors. Main data of a data frame recorded as a physical sector in this area may be set to 00h.

As shown, the control data area 160 may be composed of a plurality of clusters. As the reliability verification of the recording medium for the long term recording progresses, one verification result can be recorded as one cluster. This will be described later.

3 is a flowchart illustrating a method of verifying a recording medium according to an embodiment of the present invention. Hereinafter, the verification method of the recording medium will be described in detail with reference to FIG. 3.

First, before measuring the reliability level, it is checked whether contaminants such as dust and fingerprints exist on the surface of the recording medium, and the contaminants are removed (S10).

Next, the reliability level for long-term recording of the recording medium is measured (S20). For example, measure the maximum inner parity error in n contiguous ECC blocks for DVD-R, DVD-RW, + R, and + RW, and for a DVD-RAM, maximum bytes Measure the maximum byte error rate.

The reliability level is detected based on the internal parity error or the maximum byte error rate. For example, the internal parity error or the maximum byte error rate is evaluated at a level of 1 to 3 in the order of lowest order.

Verification devices for the measurement of reliability levels are in accordance with the standards of ISO / IEC 16448 and ISO / IEC 17592. The verification device for measuring the reliability level should be a device capable of measuring the internal parity error or the maximum byte error rate. The verification device shall be calibrated through a calibration process defined by the manufacturer.

Next, based on the reliability level measurement result, it is determined whether the data stored in the recording medium, that is, the backup is necessary (S30). At this time, if it is determined that the data backup, i.e., moving to another recording medium is necessary, the data is backed up (S40). For example, a data transfer, i.e., a backup, may be determined for a level 3 recording medium having the lowest reliability, and a use retention may be determined for a level 1 and level 2 recording medium.

When the movement of data is not necessary, the result of the reliability measurement, that is, the verification information is recorded in the verification information storage area provided in the recording medium (S50). As described above, the reliability verification result may be recorded in the verification information area provided in the lead-in area of the recording medium.

4 shows an example of an item included in the reliability verification result. As shown in FIG. 4, the reliability verification result recorded on the recording medium includes information on the date, number of times of verification, the reliability level of the recording medium, information on whether the recording medium is fully or partially verified, and defect management ( information regarding defect management, and information about defect growth rates. Hereinafter, a method of recording verification information will be described in detail.

5 shows a method of recording a reliability level according to a verification date, a frequency, and a backup reference value. In this case, two bytes, that is, six bytes in total, may be allocated to date information in the form of year / month / day (yy / mm / dd), and one byte may be allocated to the number of verifications and the reliability level. The reliability level may determine whether to back up to a new recording medium, or to keep data on an existing recording medium and the next verification run time.

FIG. 6 illustrates a method of setting a flag for determining whether a recording medium is fully or partially verified during verification of a recording medium for determining whether to back up information, and FIG. 7 illustrates a method of displaying a verified part during partial verification.

As shown in FIG. 6, the verification information includes information indicating whether the entire recording medium has been verified or partially verified when the recording medium is verified to determine whether to back up to a new disk according to a specific criterion. It may include. In this case, as shown in FIG. 7, if the recording medium is partially verified, 3 bytes may be allocated to the address at which verification has begun and the address at the end, respectively.

By using such information, not only the full verification of the recording medium but also the partial verification can be performed, thereby saving the time required for verification. In addition, data verification can be effectively performed by concentrating verification on a specific area with many defects. In this way, according to the state of the recording medium, it is possible to appropriately select and perform full verification and partial verification.

8 shows an example of a specific area in which the backup reference value is exceeded in the data area of the recording medium, and FIG. 9 shows a method of recording the specific area in FIG.

In the method of verifying a recording medium according to an embodiment of the present invention, information about an area where a defect is found in a data area of the recording medium exceeding a specific criterion may be recorded during the verification process. For example, information about a defective area where a maximum inner parity error is found to be greater than a reference value may be recorded in the verification information area. In this case, as shown in FIG. 9, the maximum internal parity error value, which is a backup standard, may be recorded for each defect area to be recorded. In this case, 3 bytes can be allocated to the start and end addresses of the defective area, and 1 byte can be allocated to the value used as the reference for the backup.

In particular, when verification is performed on n consecutive Error Correction Code (ECC) blocks, the information may be recorded only in a region where the defect found in the continuous ECC blocks is the largest. That is, the information may not be recorded for the remaining blocks of the consecutive ECC blocks.

FIG. 10 illustrates a method of determining whether to back up by comparing an increase rate of a backup reference value with a threshold when a plurality of verifications are performed.

If the reliability of the recording medium is performed two or more times, the backup reference value is higher than the previous verification result. For example, if the maximum internal parity error is greatly increased, the defect is likely to increase more in the future. It is preferable to carry out. Therefore, it is possible to indicate whether or not to exceed a value used as a reference for the backup with respect to a certain threshold value. At this time, as shown in Fig. 4, one byte can be allocated to the flag.

Fig. 11 shows a method of indicating that the recording medium for long term storage is displayed in the lead-in area. A new application code can be specified in the lead-in area to indicate that it is a recording medium for long-term archiving, which can be displayed in the pre-pit data block of the lead-in area.

Reliability verification is performed on a regular basis, and the reliability level is continuously measured based on the verification result. According to this reliability level, it is determined whether to keep using the existing recording medium, to verify again sooner than the next verification date, or to immediately move the data to the new recording medium.

By recording the reliability test results in the lead-in area of the recording medium, the user can effectively determine the reliability of the stored data for a long time, and enable the smooth movement to the new recording medium.

At this time, a plurality of recordable discs such as DVD ± RW and DVD-RAM can be repeatedly recorded in the lead-in area, and a disc that can be written once can be recorded in the lead-in area of DVD ± R. It is also possible to write sequentially to the empty space or use it in association with the data area.

The reliability test results are recorded for each verification. That is, the results from each verification are recorded in the lead-in area in cluster form for each verification.

12 shows the backup frequency according to the verification result of the recording medium. For example, in the case of the disk 1, the reliability level of the stored data is guaranteed because the reliability level is low during initial verification, and thus the verification frequency is relatively lower than that of other disks. That is, the data is considered safe even if it is kept for a long time without verification.

In practice, the verification frequency depends on past verification results. In other words, if the level verified in the first verification is low (and therefore the disk reliability is high), then the verification procedure is performed after a relatively longer time than the disk with the higher level.

After each verification, the user can take the following actions depending on the result. When data reliability is ensured, i.e., the reliability level is low (e.g., reliability level 1), only the lead-in area can be updated with a new verification result.

In addition, data reliability is not guaranteed, i.e., when the reliability level is high (e.g., reliability level 3), the data is transferred to a new recording medium.

13 is a schematic diagram showing an apparatus for verifying a recording medium according to an embodiment of the present invention. As shown in the drawing, the verification apparatus for the recording medium largely includes a data recording and reproducing apparatus 400 and a main controller 500 for controlling the recording medium.

The recording and reproducing apparatus 400 includes a pickup section 10, a signal processing section 12, a microcomputer 14, a servo 16, a memory 18, and a controller 20.

The pickup unit 10 includes a laser diode (LD) therein to record data on the surface of the recording medium 600 or to read a signal reflected from the surface of the recording medium 600.

The signal processor 12 receives a signal read out from the pickup unit 10 when the data is reproduced and restores the desired signal value, and modulates the data to be recorded on the recording medium 600 when the data is recorded. It modulates and delivers to the pickup unit 10.

The microcomputer 14 generates a control signal for controlling the tracking and focusing operations of the pickup unit 10 from the signal input through the signal processor 12.

The servo 16 controls tracking and focusing operations of the pickup unit 10 based on the control signal generated from the microcomputer 14.

The memory 18 temporarily stores management information and the like in the recording medium 600 or performs a buffer function for temporarily storing data to be recorded and reproduced.

The controller 20 receives a recording or reproducing command of the user from the main controller 500 to verify the reliability of the data. In addition, the control unit 20 measures reliability for long-term recording from the signal detected by the pickup 10, and determines whether backup of the data stored in the recording medium is necessary based on the reliability verification result. The pickup 10 is controlled to record the reliability verification result in the verification information storage area provided. In this case, the controller 20 may control to record the verification information in one cluster form.

The main controller 500 transmits a recording / playback command to the control unit 20 of the recording / playback apparatus 400 and controls the entire system. The main controller 500 may be a main controller of a computer, a server, an audio device, or a video device. That is, the recording / playback apparatus 400 may be an optical drive provided to a personal computer (PC) or the like, or may be a player not mounted on the personal computer.

Therefore, the recording and reproducing apparatus 400 according to the embodiment of the present invention can be applied to both an optical drive and a player used as a single product mounted and operated inside a PC.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a schematic diagram showing a recording medium according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the lead-in area of FIG. 1. FIG.

3 is a flowchart illustrating a method of verifying a recording medium according to an embodiment of the present invention.

4 shows an example of a method of recording a verification result.

5 shows an example of a method of recording a reliability test result.

6 shows an example of a method of recording whether partial or full verification is performed.

7 shows an example of a method of recording the position of a verified region during partial verification.

8 is a schematic diagram for illustrating a defective area.

9 shows an example of a method of recording defect management information.

10 shows an example of a method of recording information on a defect growth rate.

11 shows an example of a method of displaying a recording medium for long term storage.

12 shows an example of the reliability verification frequency according to the initial reliability level.

13 is a schematic diagram of an apparatus for verifying a recording medium according to an embodiment of the present invention.

Claims (19)

A data area for recording data, and Verification information storage area for storing the result of the reliability verification of the recording medium for recording the data for a long time in the data area Recording medium comprising a. According to claim 1, A lead-in area provided on an inner circumferential side of the data area, and A lead-out area provided on an outer circumferential side of the data area More, And the verification information storage area is located in the lead-in area. According to claim 1, And the verification information storage area includes an area for storing information on a verification date, a verification frequency, and a reliability level for long term recording of the recording medium. According to claim 1, The verification information storage area includes an area for storing information on defect management. According to claim 1, The verification information storage area includes an area for storing information on a defect growth rate. According to claim 1, And a region for displaying information indicating that the recording medium is for long term storage. According to claim 1, The verification information is recorded in a cluster form. Measuring reliability level by performing reliability verification for long-term recording of data on the recording medium; Determining whether movement of data stored in the recording medium is necessary based on the reliability level; and Recording verification information related to a result of the reliability verification on the recording medium; Verification method of a recording medium comprising a. The method of claim 8, The recording medium, A lead-in area provided on an inner circumferential side of the data area, and A lead-out area provided on an outer circumferential side of the data area Including, And a verification medium for storing the verification information in the lead-in area. The method of claim 9, And the verification information includes information on a verification date of the recording medium, the number of times of verification, and reliability for long term recording. The method of claim 8, And the verification information includes information on defect management. The method of claim 8, And the verification information includes information on a defect growth rate. The method of claim 8, And a recording medium for recording the verification information in a cluster form. A pickup for detecting a data signal by irradiating light onto the recording medium; The reliability for long-term recording is measured from the signal detected by the pickup, and based on the reliability verification result, it is determined whether a backup of the data stored in the recording medium is necessary, and the verification information storage area provided in the recording medium. A control unit controlling the pickup to record the reliability verification result in Apparatus for verifying the recording medium comprising a. The method of claim 14, The recording medium, A lead-in area provided on an inner circumferential side of the data area, and A lead-out area provided on an outer circumferential side of the data area Including, And the verification information storage area is located in the lead-in area. The method of claim 14, And the verification information includes information on a verification date of the recording medium, a verification frequency, and reliability for long term recording. The method of claim 14, And the verification information includes information on defect management. The method of claim 14, And the verification information includes information regarding a defect growth rate. The method of claim 14, And the controller controls the pickup to record the verification information in a cluster form.

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