KR100393065B1 - A optical disc and method for detecting defective areas thereof - Google Patents

Abstract

Disclosed are a recordable optical disc and a method for detecting a defective area, wherein a defective area can be detected at the time of verification before recording user data.

The disclosed optical disc has the fth when N and f are 0 or an integer greater than 0, the fth basic recording unit is the first address of a basic recording unit in which an error continuously occurs, and N is the address of the last basic recording unit. It is characterized in that the defective basic units are detected as defective areas from the basic recording units up to (N-f + 1) consecutive basic recording units and (N + 1) th basic recording units.

The disclosed optical disc defective area detection method includes a method in which N and f are integers greater than 0 or greater than 0, the fth basic recording unit is the first address of a basic recording unit in which an error continuously occurs, and N is the address of the last basic recording unit. And detecting a consecutive basic recording unit from the f th basic recording unit to (N-f + 1) consecutive basic recording units and the (N + 1) th basic recording unit as a defective area. It is done.

As described above, in the present invention, the defect area is detected during verification before recording the user data on the recordable optical disc to have high reliability recording / reproducing characteristics.

Description

Optical disc and method for detecting defective areas

The present invention relates to a recordable optical disc capable of detecting a defective area upon verification before recording user data and a method for detecting the defective area.

Currently, optical discs that can be recorded, erased, and reproduced include a random access memory (DVD-RAM), a DVD-RW (Rewritable), etc. In such an optical disc, a defective area is detected before a user uses the disc. Initially, after recording the entire disc area, a defective area is detected in sector units in the case of DVD-RAM and in units of error correction code (ECC) blocks in the case of DVD-RW.

By the way, guidelines on how to manage defects of recordable discs are only presented in DVD-RAM. Specifically, in the case of a DVD-RAM, the case where a bad sector becomes an Annex is defined as informative by using a PID (Physical Identification Data) error and a row error. For example, the PID error is a case where there are three or more PID errors in one sector, and the row error is a case where there are four or more bytes of errors in one row of one ECC block. According to these guidelines, skipping replacement is used for the above defective areas without giving logical sector numbers.

However, in the case of DVD-RW, no guidelines as in DVD-RAM are presented at all. However, DVD-RW only detects defective areas during disc certification and records ECC block addresses as a list of defective areas in RMD (Recording Management Data) .However, specific defect area detection methods are not specified in the standard. not. Therefore, it is necessary to set guidelines and defect area detection criteria as a format like a DVD-RAM.

Disclosure of Invention The present invention has been made to solve the above problems, and an object of the present invention is to provide a recordable optical disc and a method for detecting a defective area, wherein the defective area can be detected so as to secure recording and / or reproduction of user data more reliably. There is this.

1 is a view showing a schematic structure of an optical disk according to an embodiment of the present invention;

2 is a view showing a schematic structure of an optical disk according to another embodiment of the present invention;

3 is a flowchart for explaining a method for detecting a defective area of an optical disc according to the present invention.

In order to achieve the above object, a defect area detection method according to the present invention is a method of detecting a defect area in a basic recording unit before recording user information on an optical disk capable of recording and / or reproducing.

When N and f are 0 or an integer greater than 0, and the f th basic recording unit is the first address of a successive basic recording unit, and N is the address of the last basic recording unit, from the f th basic recording unit ( And detecting a consecutive basic recording unit up to N-f + 1) consecutive basic recording units and up to (N + 1) th basic recording units as a defective area.

In addition, the last basic recording unit of the defective area is characterized by containing data capable of generating a PLL during reproduction.

In addition, a linking scheme is applied to the starting point of the basic recording unit after the defective area.

The basic recording unit is characterized by one of a sector, a frame and an ECC block.

In order to achieve the above object, a defect area detection method according to the present invention is a method for detecting a defect area in a basic recording unit before recording user information on an optical disc capable of recording and / or reproducing,

When N and f are zero or an integer greater than 0, the f th basic recording unit is the first address of the basic recording unit in which an error occurs continuously, and the Nth basic recording unit is the address of the last basic recording unit. (N-f + 1) consecutive basic recording units start from the fth basic recording unit when an error occurs in the area beyond the predetermined number n sync frames in the reverse direction of the recording direction from the end of the recording unit. Detecting with; characterized in that it comprises a.

Further, when an error occurs within a predetermined number n of sync frames from the end of the Nth basic recording unit, (N−f + 1) consecutive basic recording units and (N) from the fth basic recording unit. And detecting the defect area up to the +1) th basic recording unit.

In addition, the predetermined number n of the sync frames is in the range of 0 to 26.

In order to achieve the above object, an optical disc according to the present invention is an optical disc capable of recording and / or reproducing, and capable of detecting a defective area in a basic recording unit before recording user information.

When N and f are 0 or an integer greater than 0, and the f th basic recording unit is the first address of a successive basic recording unit, and N is the address of the last basic recording unit, from the f th basic recording unit ( N-f + 1) consecutive basic recording units and up to (N + 1) th basic recording units are detected as defective areas.

In order to achieve the above object, an optical disc according to the present invention is an optical disc capable of recording and / or reproducing and detecting a defective area in a basic recording unit before recording user information.

When N and f are zero or an integer greater than 0, the f th basic recording unit is the first address of the basic recording unit in which an error occurs continuously, and the Nth basic recording unit is the address of the last basic recording unit. (N-f + 1) consecutive basic recording units start from the fth basic recording unit when an error occurs in the area beyond the predetermined number n sync frames in the reverse direction of the recording direction from the end of the recording unit. It is characterized in that the detection.

Further, when an error occurs within a predetermined number n of sync frames in the reverse direction of the recording direction from the end of the Nth basic recording unit, (N−f + 1) consecutive basic recording units from the fth basic recording unit. And up to the (N + 1) th basic recording unit as a defective area.

Hereinafter, an optical disc and a method for detecting a defective area thereof according to the present invention will be described in detail with reference to the accompanying drawings.

An optical disc according to a preferred embodiment of the present invention is rewritable and is capable of detecting a defective area upon verification before recording user data, and comprises a plurality of basic recording units. However, in the present invention, when an error is detected continuously from the fth basic recording unit to the Nth basic recording unit when detecting a defective area, the f to Nth basic recording units and the (N + 1) th basic recording are detected. It is characterized in that detection is carried out to a defect area up to a unit.

This is simply because if the defect area detects up to the Nth basic recording unit in which the defective area is detected as the defective area due to no occurrence of a wobble reference signal (clock) or a reproduction clock during reproduction, by the corresponding basic recording unit in which the defect is detected. In order to prevent this, the recording unit is detected and recorded in the RMD up to the basic recording unit (N + 1) following the last basic recording unit (N) where an error occurs. Wherein f and N are zero or an integer greater than zero.

The basic recording unit may be a sector, a frame, or an ECC block.

Referring to Fig. 1, a recordable optical disc composed of a plurality of ECC blocks, the ECC block consisting of 16 sectors. In this case, during the disk verification before recording the user data, for example, if a defect is detected in the 10, 11, 12 sectors of the Nth ECC block, the defect is up to the Nth ECC block and the next (N + 1) th ECC block. To be detected as the area (D). In other words, when a defect is detected in any one of the plurality of ECC blocks, the next block having the defect is stored as a defect area. The (N + 2) th ECC block is a normal block and becomes the user data area U.

Furthermore, when the ECC error blocks are continuously generated, the first and last blocks of the consecutive error generating blocks are detected to set the defect area. For example, if a defect is found first in the f th ECC block, then a defect is found in a plurality of consecutive ECC blocks, and finally an error occurs in the N th ECC block, the first addresses f to N of the defective area and A total of (N-f + 2) consecutive blocks up to (N + 1) are stored in the defect area (D).

This has been described taking the case where the basic recording unit of the optical disc is in ECC block units as an example, and the same applies to the case where the basic recording unit is made up of sectors or frames.

When the last basic recording unit in which consecutive defects occur as described above is the Nth and the (N + 1) th basic recording unit is set as a defect area, the (N + 1) th basic recording unit includes a PLL ( Phase Locked Loop) can be stored. This makes it possible not only to record the user data but to store the data necessary for the recording and / or reproduction control, to utilize the data space usefully, and to secure the recording and / or reproducing characteristics of the user data more reliable.

Further, a linking scheme L is applied to the basic recording unit after the last basic recording unit of the defective area, that is, the user area start point of the (N + 2) th basic recording unit. The linking scheme L may be a 0 link, a 2 KB link, or a 32 KB link.

According to another embodiment, an optical disc has an error in which N and f are zero or an integer greater than 0, an error first occurs in the f th basic recording unit, and subsequently an error occurs continuously, and an error occurs last in the N th basic recording unit. When the error occurs in the area beyond the predetermined number n of sync frames in the reverse direction of the recording direction from the end of the Nth basic recording unit, from the fth basic recording unit (N-f +1) consecutive basic recording units are detected as defective areas.

If an error occurs in a region within a predetermined number n of sync frames in the opposite direction of the recording direction from the end of the Nth basic recording unit, the continuous basic recording units from f to Nth and (N + 1) Detects it as a defective area up to the first basic recording unit.

The number n of sync frames serving as a reference for determining the range of the defective area may be differently determined according to the performance of the optical disc. That is, the n is determined in consideration of the influence of the error from the place where the last error occurred to a certain extent and the error correction and recovery performance.

Therefore, if an error occurs in an area exceeding the number n of the sync frames when counting backward from the end of the basic recording unit (Nth) where the last error occurred, the effect of the error is (N + 1). Since it does not reach up to) th basic recording unit, it is only necessary to register up to Nth basic recording unit as a defective area. On the contrary, if an error occurs in an area within the number n of the sync frames when counting in the reverse direction of the recording direction from the end of the basic recording unit (Nth) where the last error occurred, the effect of the error is In order to extend to the (N + 1) th basic recording unit, it is registered as a defective area up to the (N + 1) th basic recording unit.

For example, the number n of sync frames is preferably in the range of 0-26. Referring to FIG. 2, for example, the end of an ECC block in which an error occurs continuously is Nth, and an error occurs in sectors 13, 14, and 15 of the Nth ECC block, and 22, 23rd of the 15th sector. An error occurred in the sync frame. Here, the last error occurs in the third sync frame in the reverse direction of the recording direction (arrow a direction) from the end of the last ECC block, that is, the Nth ECC block. Therefore, in this case, up to the (N + 1) th ECC block is included in the defect area.

On the contrary, if there is no error in the sync frame in the range of 0 to 26 when counting backward from the end of the Nth ECC block (arrow a direction), up to the Nth ECC block is included in the defective area.

According to the above embodiment, the defect area is detected based on the sync frame unit, thereby preventing the defect area from being affected by the area adjacent to the defect area and at the same time ensuring a wider user data area.

In this case, the linking scheme L is applied to the starting point of the user area after the last basic recording unit of the defective area. In other words, if up to the Nth basic recording unit is registered as a defective area, at the start of the (N + 1) th basic recording unit, if it is registered as a defective area up to the (N + 1) th basic recording unit, the (N + 2) th basic recording The linking scheme L is applied to the starting point of the unit.

Next, a method for detecting a defective area of an optical disc according to the present invention will be described in detail with reference to FIG. 3.

First, the entire area of the disc is verified while loading, focusing and tracking the disc. Then, an area where an error occurs in the basic recording unit of the disc is detected. The basic recording unit may be a sector, a frame or an ECC block. For example, when an error is detected in the f-th ECC block on a disc recorded in units of ECC blocks and an error is detected continuously up to the N-th ECC block, the n-th to the n-th block from which the error first occurs among the ECC error blocks are performed. The (N + 1) th block up to the block and the defect area are recorded in the RMD.

As another method, there is a method of detecting a defective area in units of sync frames in the basic recording unit such as a sector, a frame, or an ECC block. That is, when an error is first detected in the fth basic recording unit and then an error is detected in the Nth basic recording unit, whether there is an error in a predetermined number n of sync frames in the reverse direction from the end of the Nth basic recording unit. Investigate whether or not. When there are defects in the predetermined number n of sync frames, an error is generated in the portion beyond the predetermined number n sync frames from f to N and the (N + 1) basic recording unit is a defect area. If present, the basic recording unit from f to N is recorded as a defective area.

Here, the predetermined number n of the sync frames may be set to be in the range of 0-5. In the (N + 1) th basic recording unit, data capable of generating a PLL during reproduction can be recorded.

As described above, the optical disc and the method for detecting a defect area thereof according to the present invention provide a guideline for detecting a defect during verification in a recordable optical disc, and the user area is recorded by recording PLL-related data and the like instead of user data in the defect area. Can be maximized.

Claims (20)

A method for detecting a defective area on a basic recording unit before recording user information on an optical disc capable of recording and / or reproducing, When N and f are 0 or an integer greater than 0, the f th basic recording unit is the first address of the basic recording unit in which an error occurs continuously, and when N is the address of the last basic recording unit, from the f th basic recording unit ( Detecting a defective basic recording unit up to N-f + 1) consecutive basic recording units and up to (N + 1) th basic recording units as a defective area. The defect area detection method according to claim 1, wherein the last basic recording unit of the defect area contains data capable of generating a PLL during reproduction. 3. A method according to claim 1 or 2, wherein a linking scheme is applied to the starting point of the recording basic unit next to the defective area. The method of claim 1 or 2, wherein the basic recording unit is A defect area detection method comprising any one of a sector, a frame and an ECC block. A method of detecting a defective area on a basic recording unit before recording user information on an optical disc capable of recording and / or reproducing, When N and f are zero or an integer greater than 0, the f th basic recording unit is the first address of the basic recording unit in which an error occurs continuously, and the Nth basic recording unit is the address of the last basic recording unit. (N-f + 1) consecutive basic recording units start from the fth basic recording unit when an error occurs in the area beyond the predetermined number n sync frames in the reverse direction of the recording direction from the end of the recording unit. Detecting a defect area; characterized in that it comprises a. 6. The method according to claim 5, wherein when an error occurs in a predetermined number n of sync frames in the reverse direction of the recording direction from the end of the Nth basic recording unit, (N−f + 1) consecutive from the fth basic recording unit. Detecting a defective area up to a basic recording unit and a (N + 1) th basic recording unit. 7. The method of claim 5 or 6, wherein a predetermined number n of the sync frames is in a range of 0 to 26. 7. The defect area detection method according to claim 5 or 6, wherein the last basic recording unit of the defect area contains data capable of generating a PLL during reproduction. 7. The method as claimed in claim 5 or 6, wherein a linking scheme is applied to a starting point of the recording basic unit next to the defective area. The method of claim 5 or 6, wherein the basic recording unit, A defect area detection method comprising any one of a sector, a frame and an ECC block. An optical disc capable of recording and / or reproducing, and capable of detecting a defective area in a basic recording unit before recording user information, When N and f are 0 or an integer greater than 0, and the f th basic recording unit is the first address of a successive basic recording unit, and N is the address of the last basic recording unit, from the f th basic recording unit ( And N-f + 1) consecutive basic recording units and up to (N + 1) th basic recording units are detected as defective areas. 12. The optical disc of claim 11, wherein the last basic recording unit of the defective area contains data capable of generating a PLL upon reproduction. 13. The optical disc of claim 11 or 12, wherein a linking scheme is applied to a start point of a basic recording unit after the defective area. The method of claim 11 or 12, wherein the basic recording unit, An optical disc comprising any one of sectors, frames, and ECC blocks. An optical disc capable of recording and / or reproducing and detecting a defective area in a basic recording unit before recording user information, When N and f are zero or an integer greater than 0, the f th basic recording unit is the first address of the basic recording unit in which an error occurs continuously, and the Nth basic recording unit is the address of the last basic recording unit. (N-f + 1) consecutive basic recording units start from the fth basic recording unit when an error occurs in the area beyond the predetermined number n sync frames in the reverse direction of the recording direction from the end of the recording unit. An optical disc, characterized in that for detecting. 16. The apparatus according to claim 15, wherein when an error occurs within a predetermined number (n) of sync frames in the reverse direction of the recording direction from the end of the Nth basic recording unit, (N−f + 1) consecutive from the fth basic recording unit. And a (n + 1) th basic recording unit to detect a defective area as a defective basic recording unit. 17. The optical disc of claim 15 or 16, wherein a predetermined number n of the sync frames is in a range of 0 to 26. 17. The optical disc of claim 15 or 16, wherein the last basic recording unit of the defective area contains data capable of generating a PLL during reproduction. 17. The optical disc of claim 15 or 16, wherein a linking scheme is applied to a start point of a recording basic unit next to the defective area. The method of claim 15 or 16, wherein the basic recording unit, An optical disc comprising any one of sectors, frames, and ECC blocks.