CN100411044C - Data management method for processing decoding error of read back data of optical disk and optical disk drive - Google Patents

Abstract

A data management method and optical disc drive for processing decoding error of read back data of optical disc. The data management method comprises the following steps: providing a buffer pointer and a decoding pointer; using the buffer pointer to indicate an address to which un-decoded read-back data is written, wherein the address is an absolute address in a storage device or a block address of the storage device after block division; using the decode pointer to indicate a start address of a data block in decoding within the readback data; and when a decoding error occurs when a specific data segment in the data block is decoded, updating the buffer pointer to indicate that the address of the un-decoded readback data written into the storage device corresponds to the address indicated by the decoding pointer, so as to re-read the un-decoded readback data of the corresponding data block.

Description

Data management method and optical drive for dealing with decoding error of read-back data of optical disc

technical field

The invention relates to a method and device for dealing with decoding errors, in particular to a data management method and an optical drive for dealing with decoding errors in read-back data of an optical disc.

Background technique

The reading of a traditional optical disc is based on a data sector (sector) as the decoding unit, so when a decoding error occurs and the undecoded data on the optical disc must be re-read, it is only necessary to re-read the data sector where the error occurred. And it only needs to re-decode the data segment, which is quite simple no matter whether it is implemented by hardware or software. But in digital versatile disc (digital versatile disc, DVD) or the next generation of Blu-ray disc (Blu-ray disc, BD) or high-definition disc (High-definition DVD, HD-DVD), the data is not in a data area A segment is the decoding unit, but a data block (block) composed of several data segments is used as the decoding unit. Therefore, when a decoding error occurs in any data segment and the undecoded data on the disc needs to be read again , will be more complicated than traditional CDs. As is well known in the industry, for a digital versatile disc, a data block is composed of 16 data segments, wherein the data block is a well-known ECC block; for a Blu-ray disc, it is formed by 32 data segments form a data block, wherein the data block is a known cluster (cluster); as for the high-resolution optical disc, it is composed of 32 data segments to form a data block, wherein the data area A block is known as a data segment.

Please refer to FIG. 1 , which is a schematic diagram of a conventional optical drive 100 . The optical drive 100 is capable of handling decoding errors of read-back data from an optical disc 102 , and includes a storage device 110 (such as DRAM), a control circuit 120 and a decoding circuit 130 . The storage device 110 is used as a ring buffer (ring buffer) to store the read-back data read by the optical disc 102. As shown in FIG. 1, the storage space of the storage device 110 can be regarded as divided into multiple data blocks (block) BK ₁ ˜BK _n , wherein each data block includes a plurality of data sectors (sectors) SC ₁ ˜SC _m . For Digital Versatile Discs, the value of m is 16 (that is, each ECC block contains 16 sectors), while for Blu-ray Disc and High Specification Disc, the value of m is 32 (that is, each cluster and Each data segment includes 32 sectors), as is well known in the industry, generally speaking, the data written on the disc will first be processed by interleaving (interleaving). Therefore, the data read from the disc will Before being stored in the storage device 110, it will go through de-interleaving (de-interleaving) processing. In this way, the same data segment is continuously stored in the storage device 110. In addition, another method can also be used to store The data read from the disk is directly stored in the storage device 110. In this way, the data stored in the storage device 110 is data that has not been deinterleaved. Therefore, the decoding circuit 130 needs to have the function of deinterleaving. That is, the decoding circuit 130 itself must include a de-interleaving circuit so that subsequent decoding operations can be performed smoothly. In addition, the value of n depends on the storage capacity of the storage device 110. Therefore, if the storage capacity is larger, the number of data blocks that the storage device 110 can record is also larger (that is, the value of n is larger). The control circuit 120 is coupled to the storage device 110, and the control circuit 120 includes a buffering pointer (buffering pointer) BP, a decoding pointer (decoding pointer) DP, and a read pointer (reading pointer) RP, which are used to control the storage device 110 The access of read-back data, in other words, the control circuit 120 can control a read-write head (not shown) to read data from the optical disc 102, and store the read-back data to the storage device 110. In addition, the control circuit 120 can also control The storage device 110 transmits the decoded read-back data to the host 104 . The decoding circuit 130 is coupled to the control circuit 120 and the storage device 110, and is used to decode the read-back data stored in the storage device 110. In addition, when decoding, the decoding circuit 130 performs decoding in units of data segments, and the decoding process It also includes the action of known error correction. If the decoding circuit 130 generates a decoding error when decoding a data segment, the decoding circuit 130 will output a signal S to inform the processor 140, and the processor 140 will further control the circuit 120 Determine how to adjust the buffer pointer BP, decode pointer DP and read pointer RP. The functions and correlations of the read-back data in the storage device 110 and all the pointers BP, DP, and RP in the control circuit 120 are briefly described below.

Please refer to FIG. 2 . FIG. 2 is a diagram illustrating that the buffer pointer BP, the decode pointer DP, and the read pointer RP shown in FIG. 1 point to corresponding addresses in the storage device 110 . The readback data Data_1 includes an undecoded readback data Data_2 , a decoded readback data Data_3 (that is, a specific data segment currently being decoded) and a decoded readback data Data_4 . The buffer pointer BP is used to indicate (indicate) the starting address of an undecoded readback data read from the optical disc 102 to be written to the storage device 110, that is, the undecoded readback data is followed by the undecoded readback data The data Data_2 is written into the storage device 110; the decoding pointer DP is used to indicate the starting address of the data Data_3 read back in the decoding on the storage device 110 (that is, the starting address of a specific data segment); The fetch pointer RP is used to indicate the address of the decoded readback data waiting to be read by the host 104 (eg, a personal computer), that is, the starting address of the decoded readback data Data_4 in the storage device 110 . In addition, under normal operation (that is, no decoding error occurs), if the data reading speed of the host computer 104 is faster than the data decoding speed of the decoding circuit 130, it may be decoded and read back when the decoding circuit 130 is still decoding the read data Data_3. The data Data_4 has been completely read to the host 104, so the read-back data Data_1 will only contain the undecoded read-back data Data_2 and the decoding-reading data Data_3. At this time, the read pointer RP will stay at the position of the decoding-reading-back data Data_3. The end address of the previous data segment, and when the read-back data Data_3 has been successfully decoded, the decoding pointer DP will move to the start address of the next data segment of the read-back data Data_3, and the read pointer RP is It will point to the starting address of the read back data Data_3.

As is well known in the industry, the optical drive 100 will handle the operation of decoding errors in the read-back data of the optical disc 102 in three situations. The first situation is: when a decoding error occurs, the decoded read-back data Data_3 indicated by the decoding pointer DP (corresponding to a data segment) the starting address on the storage device 110 is just the starting position of the data block corresponding to the read-back data Data_3 during decoding; the second situation is: when a decoding error occurs, the decoding pointer DP The read pointer RP does not correspond to the same data block, and the start address of the data read back during decoding Data_3 (corresponding to a data segment) indicated by the decoding pointer DP on the storage device 110 is not the data read back during decoding Data_3 The starting position of the corresponding data block; and the third situation is: when a decoding error occurs, the decoding pointer DP and the read pointer RP correspond to the same data block, and the decoding pointer DP indicates the read back data The start address of Data_3 (corresponding to a data segment) on the storage device 110 is not the start address of the data block corresponding to the data Data_3 read back during decoding.

Please refer to FIG. 1 and FIG. 3 at the same time. FIG. 3 is a schematic diagram of a first embodiment in which the optical drive 100 shown in FIG. 1 applies a known data management method to handle decoding errors. At time _T3 , the buffer pointer BP indicates that an undecoded readback data read from the optical disc 102 is to be written into the storage device 110. The starting address is the data segment SC _y (the value of y is less than or equal to the value of m ), the decoding pointer DP indicates the starting address of the data segment SC ₁ being decoded (please note that the data segment SC ₁ is the first one of the data block BK _i+3 data segment), the read pointer RP indicates the address of the decoded read-back data waiting to be read by the host 104 at present, that is, the starting address of the data segment SC _x (the value of x is less than or equal to the value of m) . When the decoding circuit 130 decodes the information of the data segment SC ₁ and a decoding error occurs, the decoding circuit 130 will output a signal S to inform the control circuit 120, since the data segment SC ₁ is the _first data sectors, therefore, at time _T'3 , the control circuit 120 only needs to update the cache pointer BP so that it points to the start address of the data sector _SC1 , therefore, the optical drive 100 will follow the updated cache pointer BP to reload the corresponding undecoded readback data from the data block BK _i+3 on the optical disc 102 (for example, the data segment SC ₁ to the data segment SC _y ) into the storage device 110 . As mentioned above, for the first situation, the optical disc drive 100 must adjust a pointer (ie buffer pointer BP).

Please refer to FIG. 1 and FIG. 4 at the same time. FIG. 4 is a schematic diagram of a second embodiment in which the optical drive 100 shown in FIG. 1 applies a known data management method to handle decoding errors. At time _T4 , the buffer pointer BP indicates that an undecoded read-back data read from the optical disc 102 is to be written into the storage device 110. The starting address is the data segment SC _y (the value of y is less than or equal to m value), the decoding pointer DP then indicates the starting address of the data segment SC _z (the value of z is less than or equal to the value of m) in decoding (please note that the data segment SC _z It is not the first data segment of the data block BK _i+3 ), the read pointer RP indicates the address of the decoded read-back data waiting to be read by the host 104 at present, that is, the data segment SC _x (of x value less than or equal to the starting address of m). When the decoding circuit 130 decodes the information of the data segment SC _z and a decoding error occurs, the decoding circuit 130 will output a signal S to inform the control circuit 120, since the data segment SC _z is not the first of the data block BK _i+3 A data section, therefore, at time _T'4 , the control circuit 120 needs to update the buffer pointer BP and the decoding pointer DP together, so that it points to the start address of the data block BK _i+3 , therefore, the optical drive 100 Then, the corresponding undecoded readback data from the data block BK _i+3 on the optical disc 102 will be reloaded into the storage device 110 according to the updated buffer pointer BP. The pointer DP is used to re-decode subsequent data segments starting from the data block BK _i+3 . As mentioned above, for the second situation, the optical drive 100 has to adjust two pointers (ie buffer pointer BP and decode pointer DP).

Please refer to FIG. 1 and FIG. 5 at the same time. FIG. 5 is a schematic diagram of a third embodiment in which the optical drive 100 shown in FIG. 1 applies a known data management method to handle decoding errors. At time T5, the buffer pointer BP indicates that the start address of an undecoded readback data read from the optical disc 102 to be written into the storage device 110 is the data segment SC _y (the value of y is less than or equal to the value of m) The starting address of the next data segment, the decoding pointer DP then indicates the starting address of the decoding data segment SC _z (the value of z is less than or equal to the value of m) (the data segment SC _z is not the data block BK The first data segment of _i+3 ); the read pointer RP indicates the address of the decoded read-back data currently waiting to be read by the host computer 104, that is, the data segment SC _j (the value of j is less than or equal to m value) starting address. As shown in FIG. 5 , the data segment SC _j and the data segment SC _z are located in the same data block BK _i+3 . When the decoding circuit 130 decodes the information of the data section SC _z and a decoding error occurs, the decoding circuit 130 will output a signal S to inform the control circuit 120, so at time _T'5 , the control circuit 120 needs to update the cache The pointer BP and the decoding pointer DP (the address pointed to by the read pointer RP will not change), so that they all point to the start address of the data block BK _i+3 , therefore, the optical drive 100 will be based on the updated cache pointer BP reloads the corresponding undecoded read-back data of the data block BK _i+3 from the optical disc 102 into the storage device 110, and re-decodes the data block BK _i+3 according to the updated decoding pointer DP Subsequent data segments are decoded. On the other hand, since the address corresponding to the read pointer RP is beyond the address corresponding to the decode pointer DP, the optical drive 100 will suspend transmitting the decoded read-back data in the storage device 110 to the host 104 until the address corresponding to the decode pointer DP The address goes beyond the read pointer RP. As mentioned above, for the third situation, the optical drive 100 must adjust two pointers (that is, the buffer pointer BP and the decoding pointer DP), and also need to remember the data that has been read by the host to prevent repeated reading by the host.

As shown in Figures 3 to 5, when an error occurs in the decoding of a data segment in the data block BK _i+3 (the above-mentioned first, second, and third situations), the data block BK _i+3 will be restarted For the decoding operation, if the data block BK _i+3 cannot be decoded smoothly, the existing optical drive 100 will give up the decoding operation for the undecoded data segment in the data block BK _i+3 , and when the host When required by 104, transmit the information of the decoded data segment in the data block BK _i+3 to the host 104, if the host 104 requests to transmit the information of the undecoded data segment in the data block BK _i+3 , then respond to the host 104 with information about processing decoding errors.

To sum up, since the decoding pointer DP does not fixedly point to the start or end address of a data block, but can point to any data segment in the data block, once a decoding error occurs At this time, the existing data management method for dealing with decoding errors needs to properly adjust the buffer pointer BP and the decoding pointer DP according to different situations. Due to the complicated judgment mechanism, the complexity of the overall optical drive 100 will eventually increase, and the optical drive 100 The performance of dealing with decoding errors will also be affected to a certain extent but not significantly.

Contents of the invention

One of the objectives of the present invention is to provide a data management method and an optical drive for dealing with decoding errors in the read-back data of an optical disc, so as to solve the above-mentioned problems.

The invention discloses a data management method for dealing with decoding errors in the read-back data of an optical disc. The read-back data is stored in a storage device in an optical drive, and the read-back data includes a plurality of data blocks, each of which is A data block contains multiple data segments. The data management method includes: (a) providing a buffer pointer and a decoding pointer; (b) using the buffer pointer to indicate that an undecoded readback data read from the optical disc is written into the storage address of the device; (c) using the decode pointer to indicate the start address of a data block being decoded within the readback data before all data sectors in the data block are successfully decoded , the decoding pointer continuously points to the start address of the data block; and (d) when decoding a specific data segment in the data block and a decoding error occurs, updating the cache pointer to indicate the The address where the undecoded readback data is written to the storage device corresponds to the address indicated by the decoding pointer, so as to reread the undecoded readback data corresponding to the data block from the optical disc.

The present invention further includes: (e) after step (d) is repeatedly executed for a predetermined number of times, only the successfully decoded data in the data block is transmitted to the host.

Step (a) further includes providing an actual decoding pointer, the data management method further includes using the actual decoding pointer to indicate a start address of a data sector being decoded in the data block, and step (e) according to The decode pointer and the actual decode pointer deliver successfully decoded data to the host.

The storage device is a dynamic random access memory DRAM.

The optical disc is a digital versatile disc DVD, a high resolution disc HD-DVD or a Blu-ray disc BD.

In addition, the present invention further discloses an optical drive, which can deal with decoding errors that occur in the read-back data of an optical disc. The optical drive includes: a storage device for storing the read-back data, and the read-back data includes There are a plurality of data blocks and the data blocks include a plurality of data sectors; a control circuit, coupled to the storage device, for controlling data access of the storage device; and a decoding circuit, coupled Connected to the control circuit and the storage device. The control circuit includes: a cache pointer, used to indicate an address for writing an undecoded readback data read from the optical disc to the storage device; and a decode pointer, used to indicate the readback a starting address of a data block in decoding within the data, wherein the decoding pointer continuously indicates the starting address of the data block until all data sectors in the data block are successfully decoded; when When the decoding circuit decodes a specific data segment in the data block and a decoding error occurs, the control circuit updates the cache pointer to indicate the address where the undecoded readback data is written to the storage device Corresponding to the address indicated by the decoding pointer, to re-read undecoded readback data corresponding to the data block from the optical disc.

After the control circuit repeatedly updates the cache pointer for a predetermined number of times, the control circuit only transmits successfully decoded data in the data block to the host.

The control circuit further includes an actual decoding pointer, which is used to indicate the start address of a data segment being decoded in the data block, and the control circuit will have successfully decoded according to the decoding pointer and the actual decoding pointer. The decoded data is passed to the host.

The storage device is a dynamic random access memory DRAM.

The disc is a digital versatile disc, a high-resolution disc or a Blu-ray disc.

The data management method of the present invention and the optical drive using the data management method also provide a decoding pointer to replace the function of the existing decoding pointer, and before all the data sectors in a decoding data block are successfully decoded, the present invention The decoding pointer disclosed by the invention will continuously indicate the start address of the data block being decoded without changing, so there is no need to do it according to different situations when a decoding error occurs in the prior art treated differently. All in all, the data management method of the present invention and the optical drive using the data management method can reduce the complexity of the overall system, and the performance of the optical drive in dealing with decoding errors will also be greatly improved.

Description of drawings

FIG. 1 is a schematic diagram of an existing optical drive.

FIG. 2 is a schematic diagram of the cache pointer, the decode pointer and the read pointer shown in FIG. 1 pointing to corresponding addresses in the storage device.

FIG. 3 is a schematic diagram of a first embodiment in which the optical drive shown in FIG. 1 applies a conventional data management method to handle decoding errors.

FIG. 4 is a schematic diagram of a second embodiment in which the optical drive shown in FIG. 1 applies a conventional data management method to handle decoding errors.

FIG. 5 is a schematic diagram of a third embodiment in which the optical drive shown in FIG. 1 applies an existing data management method to handle decoding errors.

FIG. 6 is a schematic diagram of an embodiment of the optical drive of the present invention.

FIG. 7 is a schematic diagram of an embodiment in which the optical drive shown in FIG. 6 applies the data management method of the present invention to handle decoding errors.

Optical drive 100, 600

CD 102, 602

storage device 110, 610

Control circuit 120, 620

Decoding circuit 130, 630

Host 104, 604

Detailed ways

Please refer to FIG. 6 . FIG. 6 is a schematic diagram of an embodiment of an optical drive 600 of the present invention. The function and operation of the optical drive 600 are similar to the optical drive 100 shown in FIG. 1 , and it can also handle decoding errors that occur when reading back data from an optical disc (eg, DVD) 602 . In this embodiment, the optical drive 600 includes a storage device 610 (eg DRAM), a control circuit 620 and a decoding circuit 630 . In this embodiment, the storage device 610 is used as a ring buffer to store the read-back data read by the optical disc 602. However, please note that the ring buffer is only one embodiment of the storage device 610. For the present invention, the storage device 610 is not limited to the ring buffer structure. As shown in FIG. 6 , the storage space of the storage device 610 can be regarded as divided into a plurality of data blocks BK ₁ -BK _n , wherein each data block includes a plurality of data segments SC ₁ -SC _m . For Digital Versatile Discs, the value of m is 16 (that is, each ECC block contains 16 sectors), while for Blu-ray Disc and High Specification Disc, the value of m is 32 (that is, each cluster and Each data segment includes 32 segments), and the value of n depends on the storage capacity of the storage device 610. Therefore, if the storage capacity is larger, the number of data blocks that the storage device 610 can record is also greater. Larger (that is, the larger the value of n). The main difference between the optical drive 600 of the present invention and the existing optical drive 100 is that the control circuit 620 is provided with an actual decoding pointer (actual decoding pointer) ADP in addition to the existing buffer pointer BP, decoding pointer DP and read pointer RP. In addition, the control circuit 620 also provides a new control mechanism to control the decoding pointer DP, and its related operations will be described in detail later. The decoding circuit 630 is coupled to the control circuit 620 and the storage device 610, and is used to decode the read-back data stored in the storage device 610. In addition, if the decoding circuit 630 generates a decoding error when decoding a data segment, the decoding circuit 630 will Output a signal S to inform the control circuit 620, and the control circuit 620 will further determine how to adjust the buffer pointer BP, the actual decoding pointer ADP and the read pointer RP.

The functions and operation methods of the buffer pointer BP and the read pointer RP are the same as those of the prior art, and will not be repeated here. For the decoding pointer DP, the control circuit 620 controls it to indicate the data block being decoded in the storage device 610 Please note _{that different} from the prior art, the decoding pointer DP will always be The starting address of the data block being decoded is continuously indicated without changing. In addition, the control circuit 620 also uses the actual decoding pointer ADP to indicate the starting position of the data segment currently being decoded in the data block being decoded, and its function is the same as that of the existing decoding pointer DP, in other words , since the operation of the decoding pointer DP in this embodiment is different from its original operation, the newly added actual decoding pointer ADP is used to replace the function of the original decoding pointer DP. Please note that as known in the industry, under normal operation (no decoding error occurs), the address corresponding to the decoding pointer DP and the read pointer RP will not move beyond the address corresponding to the cache pointer BP and the read pointer RP The movement of the corresponding address will not exceed the address corresponding to the decoding pointer DP.

Please refer to FIG. 6 and FIG. 7 at the same time. FIG. 7 is a schematic diagram of an embodiment in which the optical drive 600 shown in FIG. 6 applies the data management method of the present invention to handle decoding errors. At time _T71 , the cache pointer BP indicates that an undecoded read-back data read from the optical disc 602 is to be written into the storage device 610. The starting address is the data segment SC _c (the value of c is less than or equal to m value), the decoding pointer DP then indicates the starting address of the data block BK _i+2 in decoding, and the actual decoding pointer ADP indicates the data segment SC _b (b's in decoding) The value is less than or equal to the starting address of m), and the read pointer RP indicates the address of the decoded read-back data waiting to be read by the host computer 604 at present, that is, the data segment SC _a (the value of a is less than or equal to the value of m) start address. When the decoding circuit 630 decodes the information of the data segment SC _b and a decoding error occurs, the decoding circuit 630 will output a signal S to inform the control circuit 620, therefore, at time _T72 , the control circuit 620 only needs to update the buffer pointer BP and the actual decoding pointer ADP, so that they both point to the start address of the data block BK _i+2 , therefore, the optical drive 600 will reload the data block BK _i+2 from the optical disc 602 according to the updated buffer pointer BP The corresponding undecoded read-back data from the start is loaded into the storage device 610. In addition, the optical drive 600 will start from the first data segment SC ₁ in the data block BK _i+2 according to the updated actual decoding pointer ADP Perform decoding operations. Since all the data segments in the data block BK _i+2 have not been successfully decoded, the decoding pointer DP will still continuously correspond to the start address of the data block BK _i+2 .

At time _T73 , the buffer pointer BP indicates that the start address of an undecoded read-back data read from the optical disc 602 to be written into the storage device 610 is the data segment SC _e (the value of e is less than or equal to m value), the decoding pointer DP then continues to indicate the starting address of the data block BK _i+2 , and the actual decoding pointer ADP then indicates the data segment SC _m in decoding (it is the data area The starting address of the last data segment of the block BK _i+2 ), and the read pointer RP indicates the address of the decoded read-back data waiting to be read by the host 604 at present, that is, the data segment SC _d (d value less than or equal to the value of m) start address. When the decoding circuit 630 successfully decodes the information of the data segment SC _m , it means that all the data segments in the data block BK _i+2 are successfully decoded. Therefore, at time _T74 , the control circuit 620 Update the decoding pointer DP and the actual decoding pointer ADP together, so that they both point to the start address of the data block BK _i+3 . Therefore, the optical drive 600 will start from the data block BK _i according to the updated actual decoding pointer ADP. The decoding operation starts from the first data segment SC ₁ in ₊₃ . As mentioned above, for the optical drive 600 , when a decoding error occurs during decoding, the optical drive 600 only adjusts two pointers (ie, the buffer pointer BP and the actual decoding pointer ADP).

In this embodiment, if a data block in decoding cannot be successfully decoded, the control circuit 620 can properly adjust the read pointer RP, the actual decoding pointer ADP and the decoding pointer DP to directly discard the data block All the information of the block is not transmitted to the host 604, that is, even if some data segments in the data block have been decoded, the decoded read-back data corresponding to the part of the data segment will still be discarded. In addition, if a data block in decoding cannot be successfully decoded, the control circuit 620 can also convert the part of the data area that has been successfully decoded in the data block according to the actual decoding pointer ADP and the decoding pointer DP. The segment's decoded readback data is sent to the host 604 .

Compared with the prior art, the data management method of the present invention and the optical drive using the data management method provide a decoding pointer to replace the function of the existing decoding pointer, and in a decoding process, all data segments in the data block are Before successful decoding, the decoding pointer disclosed in the present invention will continue to indicate the start address of the data block being decoded without changing, so there is no need for prior art when decoding errors occur. According to different situations to do different treatment. All in all, the data management method of the present invention and the optical drive using the data management method can reduce the complexity of the overall system, and the performance of the optical drive in dealing with decoding errors will also be greatly improved.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. data managing method of handling the readback data generation decoding error of CD, described readback data is stored in the CD-ROM drive in the storage device, described readback data includes a plurality of block, each block includes a plurality of data segments, it is characterized in that described data managing method includes:

(a) provide a buffer pointers, an actual decoding pointer and a decoding pointer;

(b) readback data of not decoding that uses described buffer pointers to indicate to read from described CD writes to the address of described storage device;

(c) use described actual decoding pointer to indicate the start address of data segments in the interior decoding of described block;

(d) use described decoding pointer to indicate the start address of the block in the decoding in the described readback data, before wherein all data segments were successfully decoded in described block, described decoding pointer was indicated the start address of described block constantly; And

(e) when when a certain data blocks in the described block of decoding decoding error taking place, upgrade described buffer pointers and correspond to the indicated address of described decoding pointer, to read the not decoding readback data of corresponding described block again from described CD with the address of indicating the described readback data of not decoding to write to described storage device.

2. method according to claim 1 is characterized in that, also comprises:

(f) after step (e) repeats a pre-determined number, according to described decoding pointer and described actual decoding pointer only with the success data transfer of decoding described main frame extremely in the described block.

3. data managing method according to claim 1 is characterized in that: described storage device is a DRAM (Dynamic Random Access Memory) DRAM.

4. data managing method according to claim 1 is characterized in that: described CD is a digital versatile disc DVD, a high analytical disc HD-DVD or a Blu-ray Disc BD.

5. CD-ROM drive, the decoding error that readback data took place that it can handle CD is characterized in that, described CD-ROM drive includes:

One storage device is used for storing described readback data, and described readback data includes a plurality of block and described block includes a plurality of data segments;

One control circuit is coupled to described storage device, is used for controlling the data access of described storage device; And

One decoding circuit is coupled to control circuit and described storage device;

Described control circuit includes:

One buffer pointers is used to refer to the readback data of not decoding that reads from described CD and writes to the address of described storage device;

One actual decoding pointer is used to refer in the described block start address of data segments in the decoding; And

One decoding pointer is used to refer to the start address of the block in the decoding in the described readback data, and wherein all data segments are by before the decoding successfully in described block, and described decoding pointer is indicated the start address of described block constantly;

Wherein decode a certain data blocks in the described block and decode when described decoding circuit

During mistake, described control circuit can upgrade described buffer pointers and write to indicate the described readback data of not decoding

Go into to correspond to the indicated address of described decoding pointer to the address of described storage device, with again from institute

State the not decoding readback data that CD reads corresponding described block.

6. CD-ROM drive according to claim 5, it is characterized in that: when described control circuit repeats to upgrade after described buffer pointers reaches a pre-determined number, described control circuit according to described decoding pointer and described actual decoding pointer only with the success data transfer of decoding described main frame extremely in the described block.

7. CD-ROM drive according to claim 5 is characterized in that: described storage device is a DRAM (Dynamic Random Access Memory) DRAM.

8. CD-ROM drive according to claim 5 is characterized in that: described CD is a digital versatile disc, a high analytical disc or a Blu-ray Disc.

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