KR100283245B1 - A method for generating defect area manager data on a recording medium and a method of accessing a recording / playback point using the same - Google Patents

Abstract

The present invention relates to a method for generating a defect area manager material of a recording medium and a method for accessing a recording / reproducing point using the same, wherein a PDL and an SDL table are prepared and initialized and stored in an interface RAM in sequence (S20). This is divided into unit groups divided into predetermined number units (S30), and the number of bad sectors in each unit group is stored as an internal variable. After retrieving the order of each unit group and the address of the first bad sector in the group, it is separately stored in association with the unit group (S40). When specific address information is input from the outside (S50). It is determined whether the requested address belongs to the internal memory, and then a unit group is determined to which the read address information belongs (S60). The predetermined number of the unit group and the adjacent unit group is moved to the internal memory of the microcomputer and updated and stored (S70). The requested input address is calculated as a physical address based on previously stored data (S80). By recording data in the interface RAM at a corresponding position or reading and restoring information of the position in the interface RAM (S90). The present invention can cope with a recording medium having a large number of bad sectors without expanding the internal memory, and is a very useful invention that can be applied to a large capacity recording medium and can perform a faster conversion operation between a logical address and a physical address.

Description

A method for generating defect area manager data on a recording medium and a method of accessing a recording / playback point using the same

The present invention relates to a method for generating a defect area manager fee for a large-capacity recording medium and a method for accessing a recording / reproducing point using the manager fee generated by the method. More specifically, the information on the defect area can be efficiently stored using a peripheral memory device. Management, which allows the defective area manager to quickly access the avoided physical address without having to further increase the memory capacity of the control unit that directly controls the recording medium. A method of generating and a method of accessing a recording / reproducing point using the same.

The use of optical discs is becoming more common as CDs become more popular, and the use of DVDs (Digital Versatile Disc) standards is expected in the future. Such optical discs have been proposed such as CD-ROMs for playback only, CD-R and DVD-Rs capable of recording only once, and CD-RW and DVD-RAMs that can be repeatedly rewritten and reproduced like magnetic disks. .

In the rewritable / reproduced recording medium, in order to improve the reliability of recording / reproducing, recording is not performed on the physical sectors in which error occurs more than a certain level during recording / reproducing in the basic unit sectors of the recording medium. If a bad sector is detected and confirmed, it is recorded in a separate management table and checked every time recording / reproducing to control such that data access to the recording / reproducing point is not made.

In general, the recordable physical area of a DVD-RAM disc is composed of a lead-in area, a data area, and a lead-out area as in a read-only disc. And a defective sector management area (DMA) in the lead-out area, so that the physical sectors of the sectors when the physical sectors to which the actual data is recorded / reproduced are defective sectors with many errors. In address can be recorded.

Accordingly, when initializing a disk or searching for a defective area, if any error is detected by recording and reproducing random information in each physical sector and a predetermined level or more, the initial defect list of the DMA having the location information of the corresponding sector ( PDL: Primary Defect List. Hereinafter referred to as " PDL. &Quot;

In general, the data area in which the user can record actual information starts from the physical sector address 31000h, and the logical sector address is sequentially increased by setting the start address of the data area to 0. If a bad sector is found in the physical sector address, a PDL table is created based on this. Sequentially starting from the very beginning of the data area, the bad sector recorded in the PDL table is excluded when recording and reproducing user information in the data area. The recording and reproducing operation is performed by the logical addresses designated by the serial number.

In addition, repeated recording and reproducing operation may cause additional bad sectors that did not exist on the minimum disc due to the deterioration of the disc. Therefore, when recording data, important information is immediately replayed to immediately check whether there are bad sectors in the corresponding area. Therefore, when a bad sector is found, information is provided in 16 logical sectors (physical sectors not recorded in the PDL table) corresponding to an ECC block (consisting of 16 logical sectors) including the corresponding bad sector (physical sector). Will not be logged. Sixteen alternative sectors are selected and recorded here. At this time, an address table of a sector that replaces the address of the sector where the original ECC block starts is created. This is called an additional defect list (SDL).

Therefore, when a user requests to record or play information on the DVD-RAM, the recording and reproducing is performed by designating a logical address. However, in a DVD-RAM drive, as shown in FIG. On the basis of this, before recording, the PDL table confirms whether or not the portion to be recorded is a bad sector, and if it is a bad sector, moves to the next sector and again checks whether the moved sector is a bad sector, while assigning a logical address to a physical address. After the conversion, the corresponding sector is found and recorded / reproduced.

In the case of re-recording on a disc that has already been recorded, even if there is no registration in the PDL table, there may be a bad sector found at the time of recording, so an alternative sector may be set. If it is found that it corresponds to the sector included in the recorded ECC unit, it is recorded in 16 alternative sectors including the same.

However, conventionally, in order to find and record / play back an accurate physical sector while frequently checking a bad sector on the basis of the PDL table and the SDL table at the time of recording and reproduction, the PDL table and the SDL table are read when the disc is inserted. Since the storage capacity of the disk medium is always stored in the internal memory of the microcomputer which directly controls the optical disk medium, the recording capacity of the disk medium is gradually increased to increase the information of the bad sector to be managed or proportionately, thereby increasing the capacity of the internal memory of the disk control microcomputer. Expansion was required.

However, the increase in the capacity of the internal memory of the microcomputer not only increases the cost of the optical disk driver by increasing the price of the microcomputer, but also increases the capacity or the limitations of the microcomputer design, and to solve these problems, In the case of using a separate external memory, there is a problem in that the time required for the conversion operation between the logical address and the physical address becomes long due to access to the external memory.

Therefore, the present invention was created to solve the above problems, a method for generating a defect area manager fee for accommodating a large amount of defect area information using a peripheral memory and enabling a faster conversion operation between a logical address and a physical address. And a recording / reproducing point access method using the same.

1 shows the format of a conventional defect area manager material,

2 shows a part of a DVD player to which a method for generating a defective area manager fee of a recording medium and a recording / reproducing point access method using the same according to the present invention are applied.

3 is a flowchart showing a flow of a method for generating a defect area manager material and a recording / reproducing point access method using the same according to the present invention;

4 is a diagram illustrating an example of dividing an address of a bad sector into a predetermined number of units according to the present invention.

<Explanation of symbols for main parts of drawing>

10: external host 20: interface control unit

30: interface RAM 40: signal processing unit

41: encoder 42: decoder

100: microcomputer 100a: internal memory

In accordance with an aspect of the present invention, a method for generating a defective area manager material of a recording medium includes reading and storing information of a defective area among recordable unit areas of a recording medium: a location of the stored defective area. A second step of dividing information into unit groups having a predetermined number; and a third step of storing a location of a specific defect area among a plurality of defect areas belonging to each unit group in association with the corresponding unit group. It is that characteristic.

In addition, the recording / reproducing point access method of the recording medium according to the present invention divides the information of the defective area read out from the recording medium into unit groups having a certain number, and generates and stores index data of each unit group in association with each other. Step 1: A second step of copying and moving along with the corresponding index data by selecting a predetermined number of unit groups including the input area among the stored defective area information when inputting a location of a specific area for recording / reproducing. And a third step of calculating the actual recording / reproducing position based on the defect area information of the predetermined number of unit groups copied, the associated data, and the position information of the inputted specific region. Is there.

In the method for generating a defective area manager material of a recording medium according to the present invention and the recording / reproducing point access method using the defective area manager material generated by the present invention as described above, the defective area written in serial numbers is read out to an external memory. When storing, the data is divided into unit groups having a certain number of defect areas, and index data for indexing the defective areas of each unit group. Select to unify and store the location in association with the unit group.

Subsequently, when the position information of a specific region for recording / reproducing is input, the position value of the input specific region is searched in the defect region information using the index data formed as described above, and fast data of a plurality of adjacent unit groups is obtained. The physical location to be recorded / reproduced corresponding to the position value of the specific area designated by using the index data and the defective area information in the limited number of unit groups, which are moved and stored together with the corresponding index data in a small accessible space. Delay of access speed by using external storage space is compensated by improved search speed using index data.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a preferred embodiment of a method for generating a defect area manager material of a recording medium and a recording / reproducing point access method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a DVD player to which a method for generating a defective area manager material of a recording medium and a recording / playback point access method using the same according to the present invention is applied. Interface control unit 20 for controlling data transfer: Interface RAM 30, which temporarily stores data when data is moved under the control of the interface control unit 20: Compresses and converts the data to be recorded into a signal conforming to the recording standard. A signal processor 40 comprising an encoder 41 and a decoder 42 for restoring therefrom: a microcomputer 100 having a built-in memory 100a for temporarily storing information necessary for recording / reproducing of a DVD-RAM. It is configured to include.

3 is a flowchart illustrating an example of a method for generating a defect area manager material and a method for accessing a recording / reproducing point using the same according to the present invention. Hereinafter, the method of generating and accessing the method of FIG. Describe the flow in detail.

First, the microcomputer 100 checks the bad sectors upon initialization of the inserted DVD-RAM, and writes them into the PDL table described in the serial order. The microcomputer 100 also creates the SDL table separately for the bad sectors identified during rewriting. 41) writes to the lead-in area (lead-out area) of the DVD-RAM, and at the same time, a part of the area is allocated to the interface RAM 30 having a large capacity instead of the internal memory 100a whose capacity is limited. It stores sequentially according to the order (S20).

After the sequential storage, the addresses of the bad sectors are divided into unit groups divided into predetermined number units as shown in FIG. 4A (S30), and the number of bad sectors in each unit group is stored and stored as an internal variable. On the other hand, the order of each unit group and the address of the bad sector located in the front of the group is searched and stored separately in association with the corresponding unit group (S40).

In the table of FIG. 4A, as the index data for distinguishing and indexing each unit group, among the addresses of a plurality of bad sectors included in the unit group, the ultra-low bad sector addresses are stored separately in the serial order, but the addresses of the last bad sectors are reversed. It can also be used as index data, and the number of bad sectors included in each unit group can be adjusted as a variable in the program.

When the information on the bad sector is configured as described above, the internal memory 100a having a much faster access speed from the interface RAM 30 by limiting and selecting information of the initially set unit division areas (any number of unit groups from the beginning) is selected. In this case, the amount of data to be copied is moved, that is, the number of unit groups to be copied is determined by the size of the internal memory 100a. In addition, the microcomputer 100 receives the address of the first bad sector of a group adjacent to the unit group and not moved from the interface RAM 30 in the unit group located at the end of the unit group to be moved and stored in the internal memory. As the last address of the bad sector copied to 100a, it is stored together. By way of example, the bad sector management information constructed by copying and moving to the internal memory 100a is created as shown in FIG. 4B.

Subsequently, when address information for recording / reproducing specific information is input from the external host 10 (S50), the input address information is input to the microcomputer 100 via the interface control unit 20.

After reading this, the microcomputer 100 reads the information and determines whether the requested address belongs to the internal memory 100a. It is determined by the head address of the unit group. When included in the range of bad sectors stored in the internal memory 100a, a process of searching for a corresponding position that avoids bad sectors is performed (this process will be described in detail later). If it is determined that the first defective sector address stored separately in the information about the defective area stored in the interface RAM 30 and the read address information is compared, the unit group determined to belong to the read address information is searched. Next (S60), it is checked whether the unit group exists in the internal memory (100a) (S61), if it is determined that it does not exist, the group is searched in the interface RAM 30 (S70), and the corresponding corresponding group is found. The unit group and the adjacent unit group are copied and moved to the internal memory 100a in the microcomputer 100 to be updated and stored (S71).

After the update and storage, or when it is confirmed that the unit group exists in the presence of the internal memory 100a in step 61, that is, a defective area including the requested address is stored in the internal memory 100a. In a certain state, the microcomputer 100 determines the number of defect sectors included in the unit group stored as an internal variable, the order of the entire unit group stored in the internal memory 100a, and the details of the unit group. After calculating according to a predetermined method to replace the requested input address with a physical address using data about defective area information (S80), the data in the interface RAM 30 at the corresponding position is encoded by the encoder 41. ) Or to read and restore the information of the corresponding position through the decoder 42 and transmit it to the interface RAM 30 (S90). .

For example, information on the bad sectors as shown in FIG. 4A is constructed in the interface RAM 30, and the bad sector information configured as shown in FIG. 4B is also copied and moved in the internal memory 100a. In this case, assuming that the address of the recording / reproducing point requested by the user is 160, the microcomputer 100 once based on the first defective sector address and the last address 177 of the last unit group, the unit group to which 160 belongs. In other words, after finding the unit group whose initial defective sector is 145, the unit group checks that the index of the sequence is 2 in the entire unit group, and checks the identified identification number and the internal variable per unit block. By multiplying the number of bad sectors (5), we know that there are 10 bad sectors before that.

Subsequently, the position information of the bad sectors is read and checked one by one with respect to the unit group, and it is confirmed that there are three defective areas located before 160, respectively 145, 150, and 153.

Through the above-described process, it can be seen that there are 13 defective sectors in front of the input address, so that an information recording or information reproducing request designated at address 160 should be actually performed for the physical sector address 173. It can be calculated quickly.

When storing the unit group movement from the interface RAM 30 to the internal memory 100a, it is unnecessary to associate and store the address of the first bad sector of the adjacent unit group that has not been moved for the last unit group. This is to prevent the movement update process of the defect area information to 100a) from occurring.

For example, when the externally requested address is 172, if there is no storage of the last last address as described above, that is, there is no associated storage of 177, after checking the last unit group in the internal memory 100a, the last bad Since the address of the sector is 170, before checking the defect information data in the interface RAM 30 which has not been moved, whether the requested address is a defective area or whether there is another defective area before the requested address 172 (the bad sector is 171). In this case, since) is not known, the bad sector information of the internal memory 100a is updated by copying and moving from the interface RAM 30 to the information of the corresponding unit group so that the corresponding address of 172 can be calculated. do.

However, this unnecessary update storage process is removed by storing and managing the head address 177 of the next adjacent group that has not been moved as a separate last address, and the corresponding stored location is 187 (= 172 + 2 × 5 + 5) immediately upon request. You will know.

According to the present invention, a method for generating a defective area manager material of a recording medium and a recording / reproducing point access method using the same can correspond to a recording medium having a large number of defective sectors without expanding the internal memory. By compensating for the read delay time due to access by the search time shortened by the decrease rate of search by the representative address (index address), it is possible to apply a large capacity recording medium and to perform faster conversion between logical and physical addresses. It is a useful invention.

Claims (8)

A first step of reading information of a defective area from among recordable unit areas of a recording medium and storing it in an external memory; second step of dividing and dividing the location information of the stored defective area into unit groups having a predetermined number: and And a third step of selecting a location of a specific defect area among the plurality of defect areas belonging to each unit group as index data for indexing each unit group, and storing the data in association with the unit group. How to create a zone administrator fee. The method according to claim 1, wherein the predetermined unit group in the second step is divided so that the number of defect areas of each unit group is the same number. 3. The defect area manager material of the recording medium according to claim 1 or 2, wherein the specific defect area in the third step is a defect area located at a head of the defect areas belonging to each unit group. Way. 3. The defect area manager material of the recording medium according to claim 1 or 2, wherein the specific defect area in the third step is a defect area located at a trailing end of the defect areas belonging to each unit group. Way. The first step of dividing the information of the defective area read from the recording medium into unit groups having a certain number and generating and storing index data of each unit group: when storing the location of a specific region for recording / reproducing, A second step of copying and moving a predetermined number of unit groups including the input area among the defective area information together with the corresponding index data; and information about the defective area of the predetermined number of unit groups that have been copied and linked And a third step of calculating the actual recording / reproducing position based on the data and the positional information of the inputted specific region. The recording / reproducing point access method of claim 5, wherein the index data is an address of a defective area located at a head of the defective areas belonging to each unit group. 7. The method of claim 6, wherein in the second step, in the latter unit group of the predetermined number of copy-moved unit groups, the address of the head defective area of the non-copy unit group adjacent to the group is separately indexed. Recording and reproducing point access method of the recording medium, characterized in that it further comprises the step of generating and storing. The method as claimed in claim 5, wherein the second step comprises: checking whether the input specific area falls within a range of a defective area included in a predetermined number of unit groups previously moved and stored; Recording and recording of the recording medium, characterized in that the step of limiting selection of a predetermined number of unit groups including the input area among the defective area information stored in the first step and copying and moving along with the corresponding index data Regeneration point access method.