• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a rewritable optical record medium and a method for allocating a spare area and managing a defective area of the optical record medium, in particular, in Mode-1 (the size of the initial user area is 4.58 GB) and in Mode-2 (the size of the initial user area). 4.7 GB) of the first spare area is equally allocated, thereby increasing the mutual utilization of the mode-1 and the mode-2, and making the mode-1 and the mode-2 easy to identify by using the mode information flag. In addition, in the optical recording medium to which the first spare area and the second spare area are allocated, the linear replacement is performed as a spare block in the spare area close to the position of the defective block, thereby increasing the performance of the drive during the linear replacement. A flag indicating the presence or absence of the pool of the second spare area and the pool of the second spare area is set so that no further linear replacement is performed on the pooled spare area. In the case of Mode-1, the second spare area is allocated at the same time as the first spare area at the time of initial formatting, and the size of the second spare area of Mode-1 is the same as the maximum allowable size of the second spare area of Mode-2. This facilitates defect area management and mode switching.
    公开号:KR20040045410A
    申请号:KR1020040029041
    申请日:2004-04-27
    公开日:2004-06-01
    发明作者:박용철；한용희
    申请人:엘지전자 주식회사；
    IPC主号:
    专利说明:

    Optical recording medium and method for assigning spare area and for managing defect area of optical recording medium
    [9] The present invention relates to a rewritable optical record medium, a method for allocating a spare area of the optical record medium, and a method for managing a defective area.
    [10] In general, optical recording media are classified into three types, such as a read-only ROM type, a write once type Worm type, and a rewritable type that can be repeatedly recorded, depending on whether repeat recording is possible. Lose.
    [11] Among them, freely and repeatedly rewritable discs include a rewritable compact disc (CD-RW) and a rewritable digital versatile disc (DVD-RAM, DVD-RW).
    [12] In the case of such a rewritable optical recording medium, the recording / reproducing operation of information is repeatedly performed due to its use characteristics, and thus, the mixing ratio of the mixtures constituting the recording layer formed for recording information on the optical recording medium is increased. It becomes different from the mixing ratio and loses its characteristics, resulting in an error in recording / reproducing information.
    [13] This phenomenon is called deterioration, and this deteriorated area appears as a defect area when the format, recording, and reproducing command of the optical recording medium is executed.
    [14] In addition to the deterioration phenomenon, defect areas of the rewritable optical recording medium may be generated due to scratches on the surface, dust such as dust, errors in production, and the like.
    [15] Therefore, in order to prevent data from being recorded / reproduced in the defective areas formed due to the above reasons, it is necessary to manage the defective areas.
    [16] To this end, as shown in FIG. 1, a defect management area (hereinafter referred to as DMA) is provided in a lead-in area and a lead-out area of the optical recording medium. The defect area of the optical recording medium is managed. The data area is divided and managed by zones, and each zone is divided into a user area in which actual data is recorded and a spare area for use when a defect occurs in the user area.
    [17] In general, four DMAs exist in one disk (eg, a DVD-RAM), two DMAs exist in a lead-in area, and the other two DMAs exist in a lead-out area. Each DMA consists of two blocks, totaling 32 sectors.
    [18] Here, the first block of each DMA (called a DDS / PDL block) includes a Disc Definition Structure (DDS) and a Primary Defect List (PDL), and the second block of each DMA (called an SDL block) is an SDL (Secondary). Defect List).
    [19] In this case, PDL means main defect data storage, and SDL means defect data storage.
    [20] In general, the PDL stores entries created during the disc creation process and entries of all defective sectors that are identified during initializing, ie, initializing and re-initializing the disc. Here, each entry is composed of an entry type and a sector number corresponding to a defective sector.
    [21] On the other hand, the SDL is listed in units of blocks, and stores entries of defective areas that occur after the format or defective areas that cannot be stored in the PDL during the format. Each SDL entry consists of an area storing the sector number of the first sector of the block in which the defective sector has occurred and an area storing the sector number of the first sector of the replacement block to replace it.
    [22] In this case, the defective areas (ie, defective sectors or defective blocks) in the data area should be replaced with normal areas, and there are a replacement method such as a slipping replacement method and a linear replacement method.
    [23] The sleeping replacement method is applied when a defective area is registered in the PDL. If a defective sector exists in a user area in which actual data is recorded as shown in FIG. 2A, the defective sector is skipped. Instead, it is replaced by a good sector following the defective sector to record data. Then, the user area in which data is recorded occupies a spare area as much as the defective sector skipped and eventually skipped. That is, the spare area is allocated to the user area by the skipped defective sectors. For example, if two defective sectors are registered in the PDL, data is recorded by pushing up to two sectors of the spare area.
    [24] In addition, the linear replacement method is applied when the defective area is registered in the SDL. When a defective block exists in the user area as shown in FIG. 2B, the replacement of the block unit allocated to the spare area ( replacement) field to record the data.
    [25] On the other hand, as a method of allocating the spare area, a method of allocating only one zone of the data area or a part of the data area in addition to FIG. 1 described above has been proposed.
    [26] One of them is a method of locating a spare area at the top of the data area, as shown in FIG. 3, wherein the spare area is referred to as a first spare area (first SA). That is, the remaining data area except the first spare area becomes a user area.
    [27] The first spare area is an area allocated during an initial formatting process, and is not assigned a logical sector number (LSN). That is, the first spare area may be allocated when the disc manufacturer manufactures the optical disc or may be allocated when the user formats the blank disc for the first time.
    [28] In this case, the size of the first spare area may be variously allocated according to the size of the user area. For example, as shown in FIG. 3A, an initial data recording capacity (ie, an initial user area) is 4.5 GB (GB Giga Bytes) may be allocated 145MB (MB is Mega Byte), or 26MB may be allocated to 4.7GB as shown in (b) of FIG. 3A is referred to as Mode-1 and FIG. 3B is referred to as Mode-2.
    [29] Then, if defective sectors are registered in the PDL by initial or reformatting, data is not recorded in the defective sectors, thereby reducing the recording capacity. Thus, the # 1 spare area is sleeped to the user area by the defective sectors registered in the PDL during formatting to maintain the initial data recording capacity. That is, the physical sector number (PSN) to which the logical start position LSN = 0 of the user area is given changes according to defective sectors registered in the PDL at the time of formatting.
    [30] On the other hand, when the first spare area is to be made full by sleeping replacement or linear replacement, a new spare area is allocated again near the end of the user area as shown in FIG. The spare area at this time is called a second spare area (second SA). That is, since important data is copied at the end of the user area, the second spare area is allocated near the end rather than the end of the user area.
    [31] In addition, when the second spare area is to be full, the second spare area may be expanded as shown in FIG. 4B.
    [32] At this time, the first spare area and the second spare area cannot be active at the same time. In addition, when the second spare areas are expanded, the second spare areas cannot be activated at the same time. That is, although the second spare area may be allocated when the first spare area in the active state remains, linear replacement may not be performed on the second spare area until the first spare area is exhausted.
    [33] Therefore, in the case of allocating a spare area to a part of the data area as shown in FIG. 3, continuous writing of data is easy, while only one spare area is always active, thereby degrading performance during linear replacement. That is, the linear replacement method requires the optical pickup to be transferred to the spare area and then back to the user area in order to write the data of the defective block to the replacement block of the spare area, and the defect is located at a long distance because the spare area is only part of the data area. This is because the block takes a long time. In addition, when a spare area is allocated to each zone as shown in FIG. 1, linear replacement is performed in the corresponding spare area of the corresponding zone, and thus, since a spare area always exists between the zone and the zone, the spare area is continuously maintained during real time recording. Data recording is difficult.
    [34] On the other hand, the mode-1 and the mode-2 are the same size of the overall optical recording medium, but the first size of the first spare area is different, there is a problem that the utilization of the mutual mode is poor.
    [35] SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical recording medium for allocating the same initial size of the first spare area of Mode-1 and Mode-2.
    [36] It is another object of the present invention to provide an optical recording medium for recording the presence or absence of the full of the first spare area and the presence or absence of the full of the second spare area.
    [37] It is another object of the present invention to provide an optical recording medium for recording the type of optical recording medium according to whether or not an initial allocation of the second spare area exists.
    [38] Another object of the present invention is to provide a spare area allocation method for an optical recording medium in which mode 1 is allocated to the first spare area and the second spare area during initial formatting.
    [39] Another object of the present invention is to provide a method for managing a defective area of an optical recording medium in which linear replacement in an optical recording medium to which a first spare area and a second spare area are allocated is performed in a spare area close to a defective block.
    [1] 1 is a view showing the structure of a typical optical disk
    [2] Figure 2a shows a typical sleeping alternative method
    [3] 2b illustrates a typical linear replacement method
    [4] 3 illustrates an example in which a general spare area is allocated to a top position of a data area.
    [5] 4A and 4B illustrate an example in which a second spare area is allocated to a disk having a first spare area as shown in FIG. 3, and the second spare area is expanded.
    [6] 5 illustrates an example in which a first spare area and a second spare area are allocated at the same time in the optical recording medium according to the present invention.
    [7] FIG. 6A illustrates an entry structure to which a display flag for distinguishing between Mode-1 and Mode-2 is added to an optical record carrier according to the present invention. FIG.
    [8] FIG. 6B illustrates an entry structure in which an indication flag for displaying a first spare area pool presence state and a second spare area pool presence state is added to the optical recording medium according to the present invention; FIG.
    [40] The optical recording medium according to the present invention for achieving the above object is characterized in that the first spare area and the second spare area are respectively assigned to the inner circumference and the outer circumference at the time of formatting.
    [41] The optical recording medium according to the present invention is characterized by displaying the presence or absence of the pool of the first spare area and the presence or absence of the pool of the second spare area by using the first spare area full flag and the second spare area full flag. .
    [42] The first spare area pool flag and the second spare area pool flag may be allocated to unused areas of the DMA, respectively.
    [43] When one of the first spare area pool flag and the second spare area pool flag indicates a full state, the other spare area may be used as a substitute.
    [44] The optical recording medium according to the present invention is characterized in that the disc type is recorded by using a display flag indicating the disc type in accordance with the initial allocation of the second spare area.
    [45] The disk type indication flags are assigned to unused areas of the DMA, respectively.
    [46] According to the present invention, a method for allocating a spare area to an optical recording medium comprises assigning only a first spare area to an inner circumference or allocating a first spare area and a second spare area to an inner circumference and an outer circumference, respectively, when formatting according to a desired user area capacity. It is characterized by.
    [47] The size of the first spare area in a mode in which both the first and second spare areas are allocated at the time of formatting and the first spare area in the mode in which only the first spare area is allocated at the time of formatting are the same.
    [48] The size of the first spare area in a mode in which both the first and second spare areas are allocated at the time of formatting may vary depending on the size of the first spare area in the mode in which only the first spare area is allocated at the time of formatting. .
    [49] In the mode in which both the first and second spare areas are allocated at the time of formatting, the size of the second spare area is allocated by maximizing the remaining size minus the size of the first spare area and the size of the user area from the size of the data area. It is characterized by.
    [50] In the mode in which only the first spare area is allocated at the time of formatting, the second spare area is allocated when necessary in the data recording process in the user area.
    [51] The allowable size of the second spare area in the mode in which only the first spare area is allocated at the time of formatting is determined by maximizing the size of the second spare area in the mode in which both the first and second spare areas are allocated at the time of formatting. It is characterized by.
    [52] The mode in which both the first and second spare regions are allocated at the time of formatting may be de-allocated into a mode in which only the first spare region is allocated at the time of formatting.
    [53] The spare area allocation method of the optical recording medium according to the present invention includes a first step of determining whether there is a formatting request and a first mode or an inner peripheral area in which only the first spare area is allocated to the inner circumferential area when the formatting request is made. And a second step of selecting a second mode in which the second spare area is allocated to the one spare area and the outer circumferential area.
    [54] The method for managing a defective area of an optical recording medium according to the present invention is characterized in that when a defective block is found, data of the defective block is linearly replaced with a spare block of any one of the first and second spare areas. do.
    [55] The data of the defective block is linearly replaced by the spare block in the spare area close to the position of the defective block.
    [56] Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.
    [57] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
    [58] The present invention is intended to enhance the mutual utilization of Mode-1 (ie, the size of the initial user area is 4.58GB) and Mode-2 (ie, the size of the initial user area is 4.7GB). A second spare area (first SA) of 2 is allocated with the same size at the time of initial formatting.
    [59] In this case, in the case of mode-2, the first spare area is determined so that the size of the initial user area is 4.7 GB. If it is determined as 26 MB, in the case of mode-1, the first spare area is determined to be the same size as that of the first spare area, for example, 26 MB.
    [60] In the case of Mode-1, in order to make the initial user area size to 4.58 GB, the second spare area is made up by maximizing the total size of the data area except the size of the first spare area (first SA) and the user area. The second SA is assigned to the bottom portion of the data area as shown in FIG. 5 at the time of initial formatting. That is, the first and second spare areas of the mode-1 may be allocated when the disc manufacturer manufactures the optical disc or may be allocated when the user first formats the blank disc. In this case, in the case of mode-1, the LSN is not applied to the second spare area similarly to the first spare area.
    [61] In case of Mode-1, if the first spare area is 26MB, the second spare area may be 119MB, which may vary depending on the size of the first spare area.
    [62] In addition, since the second spare area of Mode-2 can be expanded as needed, but cannot be expanded indefinitely, it is good in terms of defect area management in that the size of Mode-2 second spare area is set to the maximum allowable size of Mode-2. . However, the maximum allowable size of the second spare area of Mode-2 may be determined within the maximum defect size that can be managed by the DMA, and may vary depending on the optical record carrier manufacturer.
    [63] On the other hand, if a defective block is found while recording or reproducing data on the optical recording medium to which the spare area is allocated as described above, and both the first spare area and the second spare area are allocated, the spare area close to the defective block as shown in FIG. 5. Improves drive performance by performing linear replacement with spare blocks. This applies equally to Mode-1 and Mode-2. Particularly, in case of Mode-2, when only the first spare area is allocated, only the first spare area is used for the linear replacement, but when the second spare area is also allocated, the first and second spare areas are used for the linear replacement. Use the appropriate spare area.
    [64] That is, data of the defective block is recorded in the spare block of the spare area, for example, in which the linear replacement is easy by the system judgment, for example, in which the movement distance of the optical pickup is shorter. This means that the allocated spare area is all active regardless of the first and second spare areas. If spare blocks remain in both the first spare area and the second spare area, any one of the first and second spare areas is determined by system determination. This means that a linear replacement is possible with a spare block of one spare area. For example, the data of the defective block generated on the inner circumferential side may be linearly replaced by the spare block of the first spare area, and the data of the defective block generated on the outer circumferential side may be linearly replaced by the spare block of the second spare area.
    [65] The mode-1 and mode-2 can be selected at the time of initial formatting, and the mode-1 and mode-2 can be switched at any time if the user desires.
    [66] That is, if Mode-1 is selected during the initial formatting, the first spare area, the second spare area, and the user area are simultaneously allocated. If the first spare area is 26 MB, the user area is 4.58 GB and the second spare area is allocated 119 MB. do. If mode-2 is selected at the time of initial formatting, only the first spare area and the user area are allocated. If the first spare area is 26 MB, the user area is allocated 4.7 GB. At this time, the second spare area of the mode-2 is additionally allocated whenever necessary.
    [67] In addition, in the case of mode conversion, in particular, from mode-1 to mode-2, only the second spare area allocated during the initial formatting needs to be deallocated. At this time, there should be no recorded data in the second spare area. If there is recorded data, the second spare area is deallocated after the data recorded in the second spare area is removed by linear replacement to the first spare area. Here, if the first spare area is a pool, the second spare area may be allocated as if the second spare area is allocated in the mode-2. The mode-2 to mode-1 conversion may be the inverse of the above-described mode-1 to mode-2 conversion process.
    [68] On the other hand, since mode selection and mode switching are easy as described above, and the initial sizes of the first spare areas of Mode-1 and Mode-2 are the same, identification of Mode-1 and Mode-2 is not easy. Therefore, there is a need for a method of distinguishing between mode-1 or mode-2 when an optical record carrier is mounted.
    [69] As one of them, a mode information flag may be added to an unused area of DMA, especially SDL or DDS, and displayed as shown in FIG. 6A. For example, if the optical disc is formatted or converted to mode-1, the mode information flag is reset to 0. If the optical disk is formatted or converted to mode-2, the mode information flag is set to 1. Therefore, if the mode information flag is 0, the mounted optical recording medium can be determined as mode-1, and if it is 1, mode-2 can be determined.
    [70] In addition, since the first and second spare areas may be active at the same time, it is necessary to know whether each spare area is full in order to determine a spare area to be used for linear replacement. To this end, the first and second spare area full flags may be added to the unused area of the DMA, particularly SDL or DDS, as shown in FIG. 6B.
    [71] For example, if a spare block for linear replacement remains in the first spare area, the first spare area full flag is reset to 0, and if there is no spare block for linear replacement remaining, that is, a full block is set to 1. In addition, if a spare block for linear replacement remains in the second spare area, the second spare area full flag is reset to 0, and if there is no spare block for linear replacement remaining, that is, a pool is set to 1.
    [72] If it is assumed that a defective block has been found and the position of the defective block is close to the first spare area, the first spare area pool flag is first checked. At this time, if the first spare area full flag is 0, the data of the defective block is linearly replaced and recorded in the spare block of the first spare area, and if 1, the full flag of the second spare area is checked. When the second spare area full flag is 0, the data of the defective block is linearly replaced in the spare block of the second spare area and written. In other words, if a spare area is full when a defective block is found, the spare area can no longer be linear replaced. In addition, when the first and second spare area pool flags are both 1, no further defect management is performed.
    [73] As described above, according to the method for allocating the spare area and the defective area management method of the optical recording medium and the optical recording medium according to the present invention, the initial size of the first spare area of Mode-1 and Mode-2 is equally assigned to each other. Interoperability between 1 and Mode-2 can be improved. At this time, a mode information flag is provided to facilitate identification of Mode-1 and Mode-2.
    [74] In addition, the linear replacement in the optical recording medium to which the first spare area and the second spare area are allocated is a spare block in the spare area close to the defective block, thereby improving the performance of the drive during linear replacement. At this time, a flag indicating the presence or absence of the pool of the first spare area and the presence or absence of the pool of the second spare area is provided so that no linear replacement is further performed on the pooled spare area.
    [75] In the case of Mode-1, the second spare area is allocated at the same time as the first spare area at the time of initial formatting, and the size of the second spare area of Mode-1 is the same as the maximum allowable size of the second spare area of Mode-2. This facilitates defect area management and mode switching.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] In the method of allocating a spare area of an optical recording medium,
    A first step of determining if there is a formatting request,
    And a second step of selecting a first mode in which only the first spare area is allocated to the inner circumferential area or a second mode in which the first spare area is allocated to the inner circumferential area and a second spare area is allocated to the outer circumferential area when the formatting request is made. Spare area allocation method characterized by the above-mentioned.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2004-04-27|Application filed by 엘지전자 주식회사
    2004-04-27|Priority to KR1020040029041A
    2004-06-01|Publication of KR20040045410A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020040029041A|KR20040045410A|2004-04-27|2004-04-27|Optical recording medium and method for assigning spare area and for managing defect area of optical recording medium|
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