KR20010002478A - Method for initializing digital video disc-RAM considering defect - Google Patents

Abstract

PURPOSE: A method for initializing DVD-RAM considering defect is provided to reduce searching time of total defect list by storing defect list generated on initialization of DVD-RAM and defect list on manufacture in a defect managing area in order. CONSTITUTION: A method for initializing DVD-RAM considering defect includes several steps. The first step is to play back DVD-RAM disk and store defect information generated on manufacture in a first memory.(70,72) The defect information has been stored in defect managing area of the DVD-RAM disk. The second step is to play back mechanical address of main data storing area of the DVD-RAM disk and detect new defects of the DVD-RAM disk and store the new defect information in a second memory in order.(74-80) The third step is to read defect information stored in the first memory and defect information stored in the second memory and store them in the third memory in order. The fourth step is to read defect information stored in the third memory and store it in defect managing area of the DVD-RAM disk in order.

Description

Method for initializing digital video disc-RAM considering defect}

The present invention relates to an information recording and reproducing apparatus, and more particularly, to a method of initializing a digital video disk-RAM disk.

Recent information recording and reproducing apparatuses have a large capacity and use replaceable recording media. When such recording media are manufactured, tracks and sectors are defined on the surface of the disc and tested for defects.

However, defects in the recording medium generated during the manufacturing process cause damage to the sectors, and thus data cannot be stored or recovered in the sectors. These defective sectors are listed by the manufacturer and become unused during the operation of the disk driver. Such a list of bad sectors is called a primary defect list (hereinafter, referred to as a PDL). The PDL is then stored in a predetermined position provided on the disk.

And when resolving a defect of a disk medium, there may be a defect of additional sectors. Sectors in which such defects exist are called secondary defects, and such defect lists are called secondary defect lists (hereinafter referred to as SDLs).

On the other hand, when the disk driver with the disk is powered on, the PDL and SDL are read from the surface of the disk and stored in the memory. Disk controllers, such as microprocessors, use information from the PDL and SDL to prevent writing data to bad sectors.

1 is a diagram illustrating a general digital video disc-RAM (hereinafter referred to as DVD-RAM) system, and includes a disc 10 for recording data and a buffer for temporarily storing data to be processed ( 11), a data processor 12 for reproducing data from the disk 10 or recording data on the disk 10, an interface unit 13 for interfacing with the host 14, a servo 15, The microcomputer 16 is provided.

On the other hand, in the digital video disk-RAM system as described above, the data structure of the disk 10 includes a lead-in area 20, a main data storage area 22, and a lead-out area 24 as shown in FIG. Equipped. The lead-in area 20 is an auxiliary area for notifying the introduction of the main data storage area 22 in the disc 10. The main data storage area 22 is an area in which main data input from the outside is recorded. The lead-out area 24 is an auxiliary area indicating that the main data storage area is over. In the lead-in area 20 and the lead-out area 24, there is a defect management area (hereinafter referred to as DMA). Two defect management areas DMA1 and DMA2 exist in the lead-in area 20, and two defect management areas DMA3 and DMA4 exist in the lead-out area 24.

3 is a diagram illustrating the structure of the DMA shown in FIG. 2, wherein the structure of the DMA includes one sector of a disc definition structure (DDS), and 15 sectors of PDL (PDL1, ... , PDL15) and 16 sectors of SDL (SDL1, ..., SDL16). Among these, in the DDS area, a DDS definition line indicating a DDS area, a disk initialization display line indicating a disk initialization state, a data group display line indicating a number of data groups existing on the data storage area of the disk, and the start of a PDL on the disk And a PDL start address display line indicating an address and an SDL start address display line indicating a start address of the SDL on the disk.

The PDL area is used when the disk is initialized. There are 15 PDL sectors. The first PDL (PDL1) includes a PDL definition indicating that it is a PDL area, an indication of the number of PDL addresses indicating the number of PDL addresses recorded in the PDL list, and a first to 511th defect in the main data storage area 22. A defect address that records the address of this generated sector is recorded. In the remaining PDLs, that is, PDL2 to PDL15, addresses of sectors in which a defect has occurred are recorded. PDLs of the PDL2 to PDL15 sequentially have 512 defective address write lines. In the disk initialization state, defects in the main data storage area 22 occur in sector units. In the processing of the defects generated at this time, a slipping replacement algorithm is used, in which the defective sector is omitted and is subsequently recorded in the next sector. In other words, when data is stored, the defective sector is omitted and continues to be stored in the next sector. In particular, when data is stored in the last sector of each group, the defective sector is recorded in the spare area sector. .

The SDL area is a normal recording and reproducing operation, and there are 16 SDL sectors. The first SDL (SDL1) includes an SDL definition indicating that it is an SDL area, an update counter, a display character indicating a block using all spare sectors, the number of SDL writes counting the replaced SDL sectors, and the main data storage area 22. The addresses of the blocks in which the first to 252th defects occur and the addresses of the replaced blocks are recorded. The address of the block where the defect occurs and the address of the replaced block are recorded in the remaining SDLs, that is, SDL2 to SDL16. The SDLs of the SDL2 to SDL15 sequentially record the addresses of blocks having 256 defects and the addresses of replaced blocks. However, defects recorded in the SDL are generated in blocks. When a defect of a predetermined criterion or more occurs in one block, the entire block is determined to be a defective block. This defective block is replaced with a spare block in the spare sector area. That is, in the SDL area, a linear replacement algorithm (Linear Replacement Algorithm) method of replacing a defective block with a spare block is used. At this time, the address of the first sector of the block in which the defect has occurred and the address of the first sector of the block of the spare area to replace it are recorded in the SDL area. For reference, in the 0.9 draft version of the DVD-RAM format, the PDL and SDL are combined to specify that the defect list does not exceed 4092. This takes into account the reliability of the disk data.

4 is a diagram showing a sector format of the data structure of a DVD_RAM disk. Referring to this, the sector format of the DVD_RAM data structure has a sector main data area 44, a physical address display area 40, and auxiliary areas 42 and 44, and the auxiliary areas 42 and 46 record data. And for reproduction.

In DVD-ROM, only the data address is used to find the desired position on the disc during playback. This data address also has a physical meaning. However, unlike a DVD-ROM, a DVD-RAM may have a different data address and physical address. That is, the data address is a logical address and changes according to a defect on the disk. Therefore, the search for a DVD-RAM disc must refer to a physical address.

In a playback-only device such as a DVD-ROM driver, the main purpose of defect management is to continuously play the disc on the disc without losing the servo tracking and continuously reproduce the correct data portion past the defective part.

However, since the DVD-RAM driver is used as an auxiliary storage device of a computer capable of recording and playing back, when the error that is not corrected after decoding the error correction code as well as the physical defect on the disc occurs, the next recording / Since there is a possibility of a problem during reproduction, it is necessary to perform defect processing in advance to ensure the reliability of the data recorded on the disc or to be recorded.

As described above, an information recording and reproducing apparatus which repeatedly performs recording and reproducing operations such as a DVD-RAM system, should refer to a defect list previously recorded in a disc or the like before performing a recording and reproducing operation of data. However, since the defect list is very large, about 64K bytes, if the defect list generated during manufacturing and the newly generated defect list when the disk is initialized are stored in the defect management area without being arranged in order, the entire defect list is searched. There is a problem that takes a long time.

The technical problem to be achieved by the present invention is to consider a defect that can shorten the retrieval time of the entire defect list by storing the defect list generated during initialization of the digital video disk-RAM and the defect list at the time of manufacture in the defect management area in order. It provides a method of initializing a digital video disc RAM.

1 illustrates a general digital video disk-RAM system.

2 is a diagram showing the data structure of a digital video disk-RAM disk.

3 is a diagram showing the structure of a defect management area.

4 is a diagram showing the data structure of a digital video disk-RAM disk.

FIG. 5 is a diagram illustrating a memory map for explaining a method of initializing a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention.

6 is a diagram illustrating a procedure of detecting a physical address.

7A and 7B are flowcharts illustrating a method of initializing a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a digital video disk-RAM system when a data processor implements a method for initializing a digital video disk-RAM in consideration of a deficiency according to the present invention.

FIG. 9 is a diagram illustrating a digital video disk-RAM system when a microcomputer implements a method of initializing a digital video disk-RAM in consideration of a deficiency according to the present invention.

In order to achieve the above object, a method of initializing a digital video disc RAM in consideration of a defect according to the present invention includes (a) reproducing a digital video disc RAM and manufacturing the digital video disc RAM stored in a defect management area of the digital video disc RAM. Storing defect information generated in the first memory; (b) reproducing only the physical address of the main data storage area of the digital video disk-RAM disk to detect new defects of the digital video disk-RAM disk and storing the detected new defect information in a second memory in order; step; (c) reading defect information stored in the first memory and defect information stored in the second memory and sequentially storing the defect information stored in the third memory; And (d) reading out defect information stored in the third memory and sequentially storing the defect information in the defect management area of the digital video disk-RAM disk.

In the step (d), the defect information stored in the third memory is preferably stored in the defect management area of the digital video disk-RAM disk in ascending order.

In addition, when reproducing only the physical address of the main data storage area of the digital video disc RAM disk in step (b), it is preferable to skip the physical address corresponding to the defect information generated during the manufacture without reproducing.

Hereinafter, a method of initializing a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

A DVD-RAM system is a record / playback system that requires users to write data on a blank disk after initializing (or formatting) the same way as when writing data to a floppy disk or hard disk in a personal computer. The necessary data can be written to disk. Since the DMA data is already determined and recorded on the disk after the initialization, new DMA data is stored in the dedicated memory area of the data processor or the microcomputer, and the data is written to the disk to avoid the defective part. . The present invention proposes a method of processing defect information generated in an initialization process that must be performed before a user writes data to a disk.

Initialization refers to formatting a disc before recording data on the disc. A blank DVD-RAM disc purchased by a user plays only a physical address portion and checks whether there is an abnormality in the physical address portion, and newly reproduces defect information. It is to record additionally in the existing DMA area which stores the defect information which occurred at the time of manufacture.

According to the present invention, when adding newly generated defect information to an existing defect information list in an existing DMA area, the entire defect information is stored in the DMA area in order to shorten the time for searching the entire defect information list. 5 shows a memory map for explaining a method of initializing a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention.

Referring to FIG. 5, in the initialization method of a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention, a DVD-RAM disk is reproduced in a first step and stored in a defect management area of the DVD-RAM disk. Defect information generated during manufacture is stored in the first memory 50 in ascending order. 01, 07, 0A, 0C, 15, 18, 20, and 3A in the first memory 50 are physical addresses of defective parts which are defect information generated during manufacturing.

In FIG. 5, the first memory 50 may store up to 4092 pieces of defect information including the PDL and the SDL, and the eighth address Adr.8 to the first address Adr.1 of the first memory 50. It is assumed that defect information is stored up to now. The physical address is composed of 4 bytes for PDL and 8 bytes for SDL, but is expressed in 2 bytes for convenience of description.

In the second step, only the physical addresses of the main data storage area of the DVD-RAM disc are reproduced to detect new defects of the DVD-RAM disc, and the detected new defect information 56 is ascending to the second memory 52 in ascending order. Save it. In the second memory 52, OB, 16, 17, and 21 are physical addresses of defective parts which are newly generated defect information.

In the third step, the defect information stored in the first memory 50 and the defect information stored in the second memory 52 are compared and stored in the ascending order in the third memory 54. As shown in FIG. 5, the defect information (01, 07, 0A, 0C, 15, 18, 20, 3A) generated during manufacturing and the newly generated defect information (0B, 16, 17, 21) are arranged in the ascending order of the third memory ( 54). In the fourth step, the defect information stored in the third memory 54 is stored in the defect management area of the DVD-RAM disc in ascending order, and the entire defect list is stored in the defect management area of the DVD-RAM disc.

FIG. 6 is a diagram for explaining a procedure of detecting new defects of a DVD-RAM disc by reproducing only a physical address of a main data storage area of the DVD-RAM disc in the second step. When reproducing the physical address 60 of the main data storage area, the defect information 62 which occurred at the time of manufacture is skipped without reproducing. Reference numeral 64 denotes newly detected defect information.

7A and 7B are flowcharts illustrating a method of initializing a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention. 7A and 7B, in the method of initializing a digital video disk-RAM in consideration of a defect according to an embodiment of the present invention, in step 70, a DVD-RAM disk is played, and in step 72, a DMA of the DVD-RAM disk is reproduced. Data is stored in the first memory 50. In step 74, only physical addresses are reproduced in the main data storage area of the DVD-RAM disc. In step 76, it is determined whether the whole reproduction is completed. In step 78, if it is determined in step 76 that the entire playback is not completed, it is determined whether an error has occurred, and if no error has occurred, the process proceeds to step 74; The generated defective address is sequentially stored in the second memory 52. In step 82, if it is determined in step 76 that the entire playback is completed, the variables i, j, k are set to 1, respectively.

In step 84, the data of the i-th address of the first memory 50 is read out and stored in the register A (not shown), and the data of the j-th address of the second memory 52 is read out into the register B (not shown). Save it. In step 86, the contents of the register A are compared with the contents of the register B, and it is determined whether the contents of the register A are smaller than the contents of the register B. In step 88, when it is determined in step 86 that the contents of register A are smaller than the contents of register B, the contents of register A are stored in the k-th address of the third memory 54. In step 90, it is determined whether or not the last address containing the defect information of the first memory 50 is present. In step 92, when it is determined in step 90 that it is not the last address with the defect information of the first memory 50, the values of i and k are increased by 1, respectively. In step 94, the data of the i-th address of the first memory 50 is read and stored in the register A, and the flow proceeds to step 86.

In step 96, when it is determined in step 86 that the content of register B is larger than the content of register A, the content of register B is stored in the k-th address of the third memory 54. In step 98, it is determined whether or not the last address containing the defect information of the second memory 52 is present. In step 100, when it is determined in step 98 that it is not the last address with the defect information of the second memory 52, the values of j and k are each increased by one. In step 102, data of the j-th address of the second memory 52 is read and stored in the register B, and the flow proceeds to step 86.

In step 104, if it is determined in step 90 that it is the last address with defect information of the first memory 50 or in step 98, it is determined that it is the last address with defect information of the second memory 52, the defect information remains. The remaining data of the existing memory is sequentially stored from the k + 1th address of the third memory 54, and the entire DMA data stored in the third memory 54 is stored in the DMA of the DVD-RAM disk.

On the other hand, the initialization method of the digital video disk-RAM in consideration of the deficiency according to the present invention may be performed by a data processor as shown in FIG. 8, or may be performed by a microcomputer as shown in FIG.

When the digital video disk RAM initialization method is performed by the data processor in consideration of the defect according to the present invention as shown in FIG. 8, the first memory area, the second memory area, and the third memory area are stored in the existing data processor dedicated buffer 114. You must set the memory area. Meanwhile, when the digital video disk RAM initialization method is performed by the microcomputer 144 considering the deficiency according to the present invention as shown in FIG. 9, the first memory area, the second memory area, and the third memory area are separately included. Defect list dedicated buffer 150 must be placed.

8 and 9, reference numerals 110 and 130 denote DVD-RAM discs, reference numerals 112 and 132 denote data modulation and demodulation units, reference numerals 116 and 136 denote memory management units, reference numerals 114 and 134, data processor dedicated buffers, reference numerals 118, Reference numeral 138 denotes an error correction code encoding / decoding unit, reference numerals 120 and 140 are defect management units, reference numerals 122 and 142 denote microcommunication units, reference numerals 124 and 144 denote microcomputers, reference numerals 126 and 146 main interface units, and reference numerals 128. , 148 represents a host.

As described above, in the initialization method of the digital video disk-RAM in consideration of the defects according to the present invention, the defect list generated when the DVD-RAM disk is initialized and the defect list at the time of manufacture are stored in the defect management area in order. There is an advantage that can shorten the search time.

Claims (3)

(a) reproducing the digital video disc RAM disk and storing defect information generated during manufacture stored in a defect management area of the digital video disc RAM disk in a first memory; (b) Detecting new defects of the digital video disk-RAM disk by reproducing only the physical address of the main data storage area of the digital video disk-RAM disk, and storing the detected new defect information in order in the second memory. Doing; (c) reading defect information stored in the first memory and defect information stored in the second memory and sequentially storing the defect information stored in the third memory; And and (d) reading out defect information stored in the third memory and sequentially storing the defect information in the defect management area of the digital video disk-RAM disk. 2. The method of claim 1, wherein in step (d), the defect information stored in the third memory is stored in the defect management area of the digital video disk RAM in ascending order. Initialization method. The method of claim 1, wherein when reproducing only the physical address of the main data storage area of the digital video disc RAM disk in step (b), the physical address corresponding to the defect information generated during the manufacturing process is skipped without being reproduced. Initialization method of digital video disc RAM considering defects.