KR20090081523A - 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 ensure reliability of data stored for a lone term and to implement efficient migration of the data 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 data area includes a verification information storage area for storing the result of reliability verification of the recording medium for long term storage. The verification information storage area includes an area for storing information indicating whether the reliability verification is full verification or partial verification.

Description

RECORDING MEDIUM, METHOD AND APPRATUS FOR VERIFICATING RECORDING MEDIUM}

The present invention relates to a recording medium, a verification method and a verification device for a recording medium. More particularly, the present invention relates to a recording medium for long term storage and a verification method and a verification device for data reliability of a recording medium for long-term recording. 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 even a backup to a new recording medium can be difficult.

In addition, even if the disk is made by the same manufacturer, the quality of the disk may be different, and may miss the backup time due to 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, a 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 data for long-term recording of data in the data area. The verification information storage area includes an area for storing information indicating whether the reliability verification is full verification or partial verification of the data area.

The verification information storage area may further include an area for storing information about the location of the data area on which the reliability verification is performed.

The verification information storage area may further include an area for storing information indicating whether the reliability verification is performed only in the area where data is recorded.

The verification information storage area may further include an area for storing information on the number of times of partial verification.

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

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 determining whether or not to verify the reliability of a part or all of the data area, based on the determination, partial test (partial test) or full verification (full) measuring the reliability level of the data for long-term recording, determining whether a backup of the data stored on the recording medium is necessary based on the reliability level, and recording verification information regarding the result of the reliability verification. Recording to the medium.

The verification information may include information about the position of the data area in which the reliability verification is performed.

When reliability verification is performed for the first time, full verification can be performed.

When performing partial verification, the reliability level may be measured for an area that does not overlap with a previously verified area based on the verification information.

Verification may be performed with respect to an area in which data is stored in the data area.

Based on the number of partial verifications performed, it may be determined whether partial verification or full verification is performed.

On the other hand, the verification apparatus of the recording medium according to the present invention determines whether the pickup to detect the data signal by irradiating light to the recording medium, and whether or not to verify the reliability of a part or all of the data area from the signal detected by the pickup, Measure the reliability for long-term recording of part or all of the area, determine whether backup of the data stored on the recording medium is necessary based on the reliability measurement result, and record the verification information related to the reliability verification result on the recording medium. And a control unit for controlling the pickup.

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 the 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, it is determined whether or not verification is performed on all or part of the recording medium (S20). In this case, the determination of whether to perform a full test or a partial test may be based on a reliability level according to a previously recorded verification result. That is, partial verification may be continuously performed when the reliability of the previous verification is good, and full verification may be performed when the reliability is low. In addition, the user may verify the whole of the partial verification by referring to the number of partial verifications.

4 shows a change in reliability of a recording medium over time. As shown in FIG. 4, the recording medium becomes less reliable due to various factors as time passes. In consideration of this, it is possible to perform a partial test on a specific area of the recording medium at the beginning of the periodic reliability verification and a full test on the entire area afterwards. Therefore, the user can efficiently verify the reliability of the recording medium.

Referring to FIG. 4, for example, at the time when the first verification (Test # 1) and the second verification (Test # 2) are performed, the reliability level having the best reliability is 1, but the third verification (Test # 3) is performed. If so, the disk quality is reduced to level 2.

5 shows an example of a periodic verification method. As shown in Fig. 5, in the initial reliability verification performed after data recording for the first time, a full test is performed to know the quality of the entire recording medium. Based on this result, when partial verification is performed in a later regular verification, the verification can be performed mainly in an area where error occurs a lot.

Next, the reliability level for long term recording is measured for all (S30) or some (S40) of the recording medium based on the above determination result. 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.

When performing verification on a part of the recording medium (S40), the user can perform verification only in the recorded area in the data area, and can perform verification by avoiding the already verified area at the next verification. At this time, in order to perform verification only on the recorded area, information indicating whether verification is performed only in the area where data is recorded may be recorded. This will be described later.

6 is a schematic diagram illustrating a method of performing partial verification. At the time of partial verification, verification can be performed at the part except the area that was performed in the previous verification. Information about the verified area is sequentially recorded in the lead-in area, and the next verification area may be determined based on this information. That is, as shown in Fig. 6, the user verifies the recorded areas that do not overlap each other in the first verification (test # 1) and the second verification (test # 2). Even in this case, a specific area for partial verification can be selected based on the result of the initial reliability verification.

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 (S50). At this time, if it is determined that the data backup, that is, moving to another recording medium is necessary, the data is backed up (S60). 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.

If the movement of data is not necessary, the reliability measurement result is recorded in the verification information storage area provided in the recording medium (S70). As described above, the reliability measurement result may be recorded in the verification information area provided in the lead-in area of the recording medium.

7 shows an example of an item included in the reliability measurement result. As shown in FIG. 7, the reliability measurement result recorded on the recording medium includes information on the date of verification, the number of times of recording, the reliability level of the recording medium, information on whether the recording medium is fully or partially verified, and defect management ( information on defect management, and the rate of defect growth. Hereinafter, a method of recording verification information will be described in detail.

8 illustrates 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. 9 illustrates a method of setting a flag for determining whether the recording medium is fully or partially verified during verification of the recording medium for determining whether to back up the information, and FIG. 10 illustrates a method of displaying the verified part during partial verification.

As shown in FIG. 9, the verification information includes information indicating whether the whole of the recording medium is 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.

Using this information, not only the full verification of the recording medium but also the partial verification can be performed, which saves 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.

11 shows a method of recording the number of partial verifications in a regular reliability test. As shown in Fig. 11, the number of partial verifications during verification on the recordable recording medium can be set to 1 byte in the lead-in area of the recording medium. As described above, the partial verification may be performed using a predetermined number of times, and then the entire verification may be performed. The reason for the need for the number of partial verifications is that in the rewritable recording medium such as DVD ± RW / -RAM, the verification information cluster can be updated in the lead-in area, so it is not easy to keep track of the pre-verification results. In addition, since the verification results are continuously recorded even on a recordable medium such as DVD ± R, the number of partial verifications can be found, but can be easily found using the recorded number of partial verification information.

Fig. 12 shows a method of recording information indicating whether or not reliability verification has been performed only for the area in which data is recorded. In this case, a new display may be added to an area indicating whether the partial verification or the full verification is performed.

FIG. 13 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. 14 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. 15 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. 7, one byte can be allocated to the flag.

Fig. 16 shows a method of indicating that the recording medium is for a long term storage in the lead-in area. A new application code can be designated in the lead-in area to indicate that it is a recording medium for long-term storage, which can be displayed in a 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.

17 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.

18 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 first determines whether partial verification or full verification is performed from the signal detected by the pickup 10, and measures reliability for long-term recording of all or part of the recording medium according to the determined result. Based on the measurement result, it is determined whether the backup of the data stored in the recording medium is necessary, and the pickup 10 is controlled to record the reliability measurement result in the verification information storage area provided in the recording medium. 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, and the present invention is also provided. Naturally, it belongs to the range of.

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 is a graph illustrating a change in reliability of data stored in a recording medium with time.

5 shows an example of a regular reliability verification method.

6 shows an example of a partial verification method.

7 shows an example of a method of recording verification information.

8 shows an example of a method of recording a reliability verification result.

9 shows an example of a method of recording whether the partial verification or the full verification.

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

11 shows an example of a method of recording information on the number of times of partial verification.

12 shows an example of a method of recording partial verification, full verification and verification of the recorded area.

13 is a schematic diagram for illustrating a defective area.

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

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

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

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

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

Claims (17)

A data area for recording data, and A verification information storage area for storing a result of reliability verification of data for long-term recording of the data in the data area Including, The verification information storage area, And an area for storing information indicating whether the reliability verification is full verification or partial verification of the data area. According to claim 1, The verification information storage area further includes an area for storing information on the position of the data area on which the reliability verification is performed. According to claim 1, The verification information storage area further includes an area for storing information indicating whether the reliability verification is performed only in an area in which data is recorded. According to claim 1, The verification information storage area further includes an area for storing information on the number of times of partial verification. 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. The method of claim 5, The verification information is recorded in a cluster form. Determining whether to verify reliability of a part or all of the data area, Based on the determination, performing a partial test or a full test on the data area to measure a reliability level of data for long-term recording; Determining whether a backup of data stored in the recording medium is necessary based on the reliability level; and Recording verification information on a result of the reliability verification on the recording medium; Verification method of a recording medium comprising a. The method of claim 7, wherein And the verification information includes information about a position of the data area in which the reliability verification is performed. The method of claim 8, And verifying the recording medium for performing a full verification when the reliability verification is performed for the first time. The method of claim 8, And performing the partial verification, measuring a reliability level of a region that does not overlap with a previously verified region based on the verification information. The method of claim 7, wherein And a verification method for the data storage area of the data area. The method of claim 7, wherein And in the determining step, determining whether to perform partial verification or full verification based on the number of partial verifications. The method of claim 7, wherein 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 recording the verification information in the lead-in area. The method of claim 13, 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; From the signal detected by the pickup, it is determined whether or not the reliability is verified for a part or all of the data area, the reliability for long term recording is measured for a part or all of the data area, and based on the reliability measurement result, A control unit which determines whether a backup of data stored on a recording medium is necessary and controls the pickup to record verification information related to the reliability verification result on the recording medium; Apparatus for verifying the recording medium comprising a. The method of claim 15, 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 is stored in the lead-in area. The method of claim 16, And the controller controls the pickup to record the verification information in a cluster form.

Images