KR20000033285A - Optical recording medium and method for limiting space region assignment of optical recording medium - Google Patents

Abstract

PURPOSE: An optical recording medium is to record extension times of a supplementary space region and limit an extension of the supplementary space region. CONSTITUTION: An optical recording medium comprises recording an extension times information of a supplementary space region on a fixed region of optical recording medium each time the supplementary space region is allocated. The extension times information is applied on the optical recording medium with the limit times decided. The extension times information is applied on the optical recording medium with a size of a maximum allowable supplementary space region decided. The extension times information is applied on the optical recording medium with the limit times and the maximum allowable supplementary space region decided. The extension times information is to use an unused region of detect management region.

Description

Method of limiting spare area allocation of optical record carrier and optical record carrier

The present invention relates to a rewritable optical record carrier and a method for limiting the spare area allocation of the optical record carrier.

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.

Among them, freely and repeatedly rewritable discs include a rewritable compact disc (CD-RW) and a rewritable digital versatile disc (DVD-RAM, DVD-RW).

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.

This phenomenon is called deterioration, and the deteriorated area appears as a defect area when the format, recording, and reproducing command of the optical recording medium is executed.

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.

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.

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.

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.

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).

In this case, PDL means main defect data storage, and SDL means defect data storage.

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.

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.

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.

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, the defective sector is skipped. The data is recorded by being replaced by a good sector. Then, the user area in which data is recorded occupies a spare area as much as the defective sector skipped and eventually skipped. In addition, the linear replacement method is applied when a defective area is registered in the SDL. If a defective block exists in the user area, the linear replacement method is replaced with a replacement area in units of blocks allocated to the spare area. Record it.

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.

One of them is a method of positioning a spare area at the top of the data area, as shown in FIG. 2, and the spare area at this time is called a primary spare area (SA-pri). That is, the remaining data area except the main spare area becomes a user area.

The primary spare area is an area allocated during the initial formatting process, and is not assigned a logical sector number (LSN). That is, the primary 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.

In this case, the size of the main spare area may be variously allocated according to the size of the first user area. For example, 26MB (GB is Giga Byte) to set the initial data recording capacity (that is, the first user area) to 4.7 GB (GB is Giga Byte). MB may allocate Mega Byte).

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. Therefore, the main spare area is slipped 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.

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 supplementary spare area (SA-sup).

That is, since important data is copied at the end of the user area, the auxiliary spare area is allocated near the end, not the end of the user area.

In addition, when the auxiliary spare area is to be full, the auxiliary spare area may be expanded as shown in FIG.

At this time, an opinion is proposed that the expansion of the auxiliary spare area is made to increase by a certain size (eg, 32 MB).

However, when the auxiliary spare area is extended indefinitely, the disk use efficiency is rather reduced, and in particular, it is not meaningful to expand it unconditionally because it is limited by the DMA condition.

Accordingly, an object of the present invention is to provide an optical recording medium which records the number of expansion of the auxiliary spare area to limit the expansion of the auxiliary spare area.

Another object of the present invention is to provide a method for allocating a spare area allocation of an optical recording medium that does not allow the expansion of the auxiliary spare area when the number of extension of the auxiliary spare area exceeds the limit.

Another object of the present invention is to limit the spare area allocation of the optical recording medium that does not allow the expansion of the auxiliary spare area if the size of the current auxiliary spare area determined by the number of expansion of the auxiliary spare area exceeds the maximum allowable size of the auxiliary spare area. In providing a method.

Another object of the present invention is to not allow the expansion of the auxiliary spare area if the extension number exceeds the limit even if the size of the current auxiliary spare area obtained by the number of extension of the auxiliary spare area is smaller than the maximum allowable auxiliary spare area. A method of limiting spare area allocation of an optical record carrier is provided.

1 is a diagram showing a structure of a general optical recording medium in which spare areas are allocated to zones.

2 shows a structure of a general optical recording medium in which a spare area is allocated to the top position of the data area;

3 (a) and 3 (b) show an example in which an auxiliary spare area is allocated to a disk having a primary spare area as shown in FIG. 2 and the auxiliary spare area is expanded.

4 is a view showing a structure of an area in which an extension number of an auxiliary spare area is recorded in an optical recording medium according to the present invention;

5 is a flowchart showing a first embodiment of a method for limiting spare area allocation of an optical record carrier according to the present invention;

6 is a flowchart showing a second embodiment of a method for limiting spare area allocation of an optical record carrier according to the present invention;

7 is a flowchart showing a third embodiment of the method for limiting the spare area allocation of the optical record carrier according to the present invention.

The optical recording medium according to the present invention for achieving the above object is characterized in that the information on the extension number of the auxiliary spare area is recorded in a predetermined area of the optical recording medium whenever the auxiliary spare area is allocated.

The extension number information may be applied to an optical recording medium having a limited number of times.

The extension number information may be applied to an optical recording medium having a maximum allowable auxiliary spare area size determined.

The extension number information may be applied to an optical recording medium having a limited number of times and a maximum allowable auxiliary spare area determined.

The extension count information is recorded using an unused area of the defect management area.

According to an aspect of the present invention, there is provided a method of allocating a spare area allocation to an optical recording medium, the method comprising: checking an extension number of an auxiliary spare area; determining whether the extension number determined in the step exceeds a preset limit number; And if it is determined that the number of expansions exceeds the limit, the step of not allowing the extension of the auxiliary spare area is included.

According to an embodiment of the present invention, there is provided a method of limiting an auxiliary spare area allocation of an optical recording medium. The method may further include: checking an extension number of an auxiliary spare area, obtaining a size of a currently allocated auxiliary spare area by using the extension number identified in the step; Comparing the preset maximum allowable spare spare area with the preset maximum spare spare area; and if the size of the currently allocated spare spare area is determined to exceed the maximum allowable spare spare area, Characterized in that comprises a step.

If it is determined in the comparing step that the size of the currently allocated auxiliary spare area does not exceed the maximum allowable size of the auxiliary spare area, allocating the auxiliary spare area in an increment of a predetermined predetermined size and recording the increased number of extension information It is characterized in that it further comprises.

If it is determined in the comparing step that the size of the currently allocated auxiliary spare area does not exceed the maximum allowable size of the auxiliary spare area and the size of the user area that can be allocated to the auxiliary spare area is smaller than the preset increment, Only the size is allocated to the auxiliary spare area and the increased number of extension information is recorded.

If it is determined in the comparing step that the size of the currently allocated auxiliary spare area does not exceed the maximum allowable size of the auxiliary spare area, it is compared whether the extension number exceeds the preset limit number. It further comprises the step of not allowing the assignment.

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.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is to limit the expansion of the auxiliary spare area by recording the extension number information each time the auxiliary spare area is allocated and extended.

To this end, each time the auxiliary spare area is allocated or extended to the recording area as shown in FIG. 4, the number of extension of the auxiliary spare area is increased by one. The extended number information recording area may use DMA, in particular, an unused area of SDL or DDS.

For example, when the number of expansions is 0, it means that only the primary spare area is allocated to the optical recording medium and the auxiliary spare area is not allocated. In addition, when the auxiliary spare area is allocated, the number of expansion increases by one, and thereafter, the number of increments increases by one each time the auxiliary spare area is expanded.

The extension number of times is reset at the time of initial formatting, and at the time of reformatting, the reset is determined according to the presence or absence of the auxiliary spare area. That is, when the auxiliary spare area is allocated to the user area again by reformatting, the extension number is reset. If the auxiliary spare area is maintained as it is, the extension number is not reset but is maintained.

Meanwhile, in order to limit the allocation of the auxiliary spare area using the extension number information, a limit number may be set, a maximum allowable auxiliary spare area may be set, and both a limit number and a maximum allowable auxiliary spare area may be set. Can also be set.

5 to 7 are flowcharts illustrating methods of limiting allocation of the auxiliary spare area by using the extension number, which will be described by dividing into the first to third embodiments.

First embodiment

Fig. 5 is a flowchart showing a first embodiment of the method for limiting the spare area allocation of the optical record carrier according to the present invention, in which the limit number is set in advance and the extension of the auxiliary spare area is limited.

If it is determined that the auxiliary spare area is necessary due to the occurrence of the defective block (step 501), the extension number information recorded in the extension number information recording area of the auxiliary spare area as shown in Fig. 4 is read (step 502).

Then, it is determined whether the extension number is smaller than the preset limit number (step 503). In this case, if it is determined in step 503 that the extension number is smaller than the preset limit number, it means that a user area that can be allocated to the auxiliary spare area remains, and thus, the auxiliary spare area is allocated in a predetermined increment. Then, the extension number of the information recording area extension number of the auxiliary spare area is increased by one (step 505).

On the other hand, if it is determined in step 503 that the extension number is greater than or equal to the preset limit number, it means that there is no user area that can be allocated to the auxiliary spare area, and thus the expansion of the auxiliary spare area is not permitted (step 506).

For example, if the increment is set to 32 MB and the limit is set to 4, increase the number of expansions by allocating 32 MB each time the secondary spare area needs to be expanded. Can't. In addition, if the increment is set to 1 MB and the limit is set to 120, when the extension of the secondary spare area is needed, the number of expansions is increased while allocating 1 MB, and when the extension is 120, the secondary spare area can no longer be extended. .

Second embodiment

Fig. 6 is a flowchart showing a second embodiment of the method for limiting the spare area allocation of the optical recording medium according to the present invention, in which the maximum allowable size of the auxiliary spare area is set in advance, and the expansion of the auxiliary spare area is limited.

Here, the maximum allowable size of the auxiliary spare area may vary depending on the DMA condition, and may also vary according to the size of the primary spare area and the size of the initial user area.

For example, if the DMA condition is equal to the following Equation 1, the maximum allowable auxiliary spare area may be set to about 120 MB.

Here, S _PDL is the number of sectors used to hold the PDL entries, S _SDL is the number of sectors used to hold the SDL entries, E _PDL is the number of PDL entries, and E _SDL is the number of SDL entries. And, Denotes the largest integer not greater than P.

That is, the total number of sectors that can be used for the PDL and the SDL cannot exceed 16 sectors, and the PDL alone or the SDL alone cannot exceed 15 sectors.

At this time, according to the above equation 1, the defect area that can be managed by the DMA to the maximum becomes about 145MB (= 121MB + α). For example, since a defect area that SDL 1 sector can manage is 8 MB and a PDL 1 sector can be managed 1 MB, adding SDL 15 sectors (= 120 MB) to PDL 1 sector (= 1 MB) becomes 121 MB. In consideration of the defect in the spare area, α is added to 145MB. That's about 3% of 4.7GB. That is, up to about 3% of the spare area can be allocated.

Therefore, if the initial recording capacity of the user area is 4.7 GB and the primary spare area is allocated 26 MB, the auxiliary spare area can be allocated up to 119 MB.

On the other hand, if the size of the maximum allowable auxiliary spare area is determined as described above, and it is determined that the auxiliary spare area is necessary due to the generation of a defective block (step 601), it is recorded in the extended number information recording area of the auxiliary spare area as shown in FIG. Read the extended number of times information (step 602).

Then, the size of the currently allocated auxiliary spare area is calculated using the extension number information (step 603). If the auxiliary spare area continues to be expanded by a certain size increment, multiplying the increase by the number of expansions (= increment × number of expansions) can determine the size of the currently allocated auxiliary spare area.

If the size of the currently allocated auxiliary spare area is obtained in step 603, the size of the currently allocated auxiliary spare area is compared with the preset maximum allowable auxiliary spare area (step 604).

If it is determined in step 604 that the size of the currently allocated auxiliary spare area is smaller than the maximum allowable size, it means that a user area that can be allocated to the auxiliary spare area remains. Step 605).

At this time, when the size of the user area that can be allocated to the auxiliary spare area is smaller than the predetermined incremental size, only the size of the assignable user area is allocated to the auxiliary spare area.

For example, if the predetermined incremental size is 32MB, the secondary spare area is extended by 32MB. If the user area that can be allocated to the spare spare area is about 29MB within the size of the maximum allowable spare spare area, only 29MB is spare spare. Assign it to an area.

This may occur even when the size of the maximum allowable auxiliary spare area is not a multiple of the increment, and the data is recorded within the size of the maximum allowable auxiliary spare area even though the size of the maximum allowable auxiliary spare area is determined as a multiple of the increment. It can also happen if That is, at this time, the auxiliary spare area is extended by the increase in the variable size.

Therefore, when the auxiliary spare area is expanded to a variable size instead of a predetermined increment, the variable size should also be taken into consideration when calculating the size of the currently allocated auxiliary spare area.

When the auxiliary spare area is allocated in the predetermined increment or variable size as described above, the number of expansion of the extension number information recording area is increased by one (step 606).

In addition, if a user area that can be allocated to the auxiliary spare area is secured due to deletion of data later, the steps 601 to 605 may be sequentially performed to expand the auxiliary spare area again within the maximum allowable size. The number of expansions of the extended number information recording area such as 1 is increased by one.

On the other hand, if it is determined in step 604 that the size of the currently allocated auxiliary spare area is greater than or equal to the size of the maximum allowable auxiliary spare area, the expansion of the auxiliary spare area is not allowed (step 607).

Third embodiment

Fig. 7 is a flowchart showing a third embodiment of the method for limiting the spare area allocation of the optical recording medium according to the present invention, in which the limit number of times and the maximum allowable auxiliary spare area are set in advance. Satisfaction is limited to the expansion of the auxiliary spare area.

At this time, the limit number and the maximum allowable size of the auxiliary spare area are applied in the same manner as in the first and second embodiments described above.

Therefore, when the limit number and the maximum allowable auxiliary spare area are determined as described above, and it is determined that the auxiliary spare area is necessary due to the generation of the defective block (step 701), the number of times recorded in the extended number information recording area as shown in FIG. The extension count information is read (step 702).

Then, the size of the currently allocated auxiliary spare area is obtained using the extension number information (step 703). Similarly, the method for obtaining the size of the currently allocated auxiliary spare area is the same as that of the second embodiment described above, and thus, detailed description thereof will be omitted.

Therefore, if the size of the currently allocated auxiliary spare area is obtained in step 703, the size is compared with the preset maximum allowable auxiliary spare area (step 704).

If it is determined in step 704 that the size of the currently allocated auxiliary spare area is smaller than the maximum allowable size, it is compared whether the extension number is smaller than the preset limit number (step 705).

If it is determined in step 704 that the size of the currently allocated auxiliary spare area is smaller than the maximum allowable size and the extension number is smaller than the preset limit number, the auxiliary spare area is allocated in increments of a predetermined fixed size (step 706).

At this time, when the size of the user area that can be allocated to the auxiliary spare area is smaller than the predetermined increment, the device is allocated to the auxiliary spare area only as much as the size of the assignable user area.

Then, the expansion count of the auxiliary spare area information recording area is increased by one (step 707).

On the other hand, if it is determined in step 704 that the size of the currently allocated auxiliary spare area is not smaller than the maximum allowable auxiliary spare area, or if it is determined in step 705 that the number of expansions is not smaller than the limit, the extension of the auxiliary spare area is extended. Not allowed (step 708).

That is, even within the maximum allowable size, if the number of expansion exceeds the limit, the auxiliary spare area is prohibited from expanding.

This case occurs when data is recorded within the maximum allowable size, so that the spare area is allocated with a variable size, the number of expansions is increased by 1, and the user area that can be allocated to the spare spare area is secured by deleting data again. In this case, if the number of expansions exceeds the limit, even if a user area that can be allocated to the auxiliary spare area remains, the expansion to the auxiliary spare area is prohibited.

As described above, according to the method for allocating an optical record medium and a spare area allocation of the optical record medium according to the present invention, each time the auxiliary spare area is allocated to the optical record medium to which the primary spare area is allocated, the extension number of the auxiliary spare area is recorded. By doing so, it is possible to limit the expansion of the auxiliary spare area. In addition, since the number of expansions is recorded, the size of the auxiliary spare area in which the system is easily expanded can be confirmed, and since the expansion of the auxiliary spare area is limited, there is no problem that the spare area is expanded indefinitely, thereby improving the performance of the system. .

In particular, the limit number of times or the maximum allowable auxiliary spare area is determined and the number of extension of the auxiliary spare area exceeds the limit number, or the size of the current auxiliary spare area obtained as the extension number exceeds the maximum allowable size, or If any one of the above constraints is satisfied first, the extension of the auxiliary spare area is not allowed.

Claims (10)

In an optical recording medium to which an auxiliary spare area is allocated as required, The information recording frequency of the auxiliary spare area is recorded in a predetermined area of the optical recording medium whenever the auxiliary spare area is allocated. The method of claim 1, wherein the extension number information An optical record carrier, characterized in that applied to an optical record carrier having a limited number of times determined. The method of claim 1, wherein the extension number information An optical record carrier, characterized in that the size of the maximum allowable auxiliary spare area is applied to the determined optical record carrier. The method of claim 1, wherein the extension number information An optical recording medium, characterized in that a limit number and a maximum allowable auxiliary spare area size are applied to the determined optical recording medium. The method of claim 1, wherein the extension number information And recording using an unused area of the defect management area. In the method of allocating an auxiliary spare area allocation of an optical recording medium to which an auxiliary spare area is allocated whenever necessary, Confirming an extension number of the auxiliary spare area; Determining whether the number of expansions identified in the step exceeds a preset limit number; And disabling the extension of the auxiliary spare area if it is determined that the number of expansions exceeds the limit number. In the method of allocating an auxiliary spare area allocation of an optical recording medium to which an auxiliary spare area is allocated whenever necessary, Confirming an extension number of the auxiliary spare area; Obtaining the size of the currently allocated auxiliary spare area by using the number of expansions identified in the step, and comparing the size with the preset maximum allowable auxiliary spare area; If it is determined that the size of the currently allocated auxiliary spare area exceeds the maximum allowable size of the auxiliary spare area, the step of disallowing the allocation of the auxiliary spare area is included. Limitation method. The method of claim 7, wherein If it is determined in the comparing step that the size of the currently allocated auxiliary spare area does not exceed the maximum allowable size of the auxiliary spare area, allocating the auxiliary spare area in an increment of a predetermined predetermined size and recording the increased number of extension information The spare area allocation limitation method of the optical recording medium, further comprising. The method according to claim 7 or 8, If it is determined in the comparing step that the size of the currently allocated auxiliary spare area does not exceed the maximum allowable size of the auxiliary spare area and the size of the user area that can be allocated to the auxiliary spare area is smaller than the preset increment, A spare area allocation limitation method for an optical recording medium, characterized in that it is allocated to the auxiliary spare area only as much as the size and the increased number of expansion information is recorded. The method of claim 7, wherein If it is determined in the comparing step that the size of the currently allocated auxiliary spare area does not exceed the maximum allowable size of the auxiliary spare area, it is compared whether the extension number exceeds the preset limit number. The method of claim 1, further comprising the step of disallowing allocation.