JP5055311B2 - Disk unit - Google Patents

Description

  The present invention relates to a disk device.

  In the disk device, a technique for increasing the reliability of recorded data by recording the same data in two or more areas has been used. One of the techniques is replacement processing. In the replacement process, when the quality of recorded data is low, the data is re-recorded in another area on the disc called a replacement area. As an example of the technology related to the replacement process, there is the following patent document.

JP 2006-85797 A

  In the conventional replacement process, the user data area in which normal data is recorded and the replacement area in which data by re-recording is recorded must move to each other during recording and reproduction. It took time. In addition, since the capacity of the replacement area is smaller than that of the user data area, the replacement process cannot be performed after the replacement area is used up.

  This invention makes it a subject to eliminate the said problem in the conventional replacement process, and to provide an efficient replacement process.

  The above object can be achieved by the invention described in the claims.

  In the disk device, efficient replacement processing can be performed.

Operation diagram of recording process performed by disk device according to the present invention Configuration diagram of a disk device in which the present invention is implemented Operation diagram of replacement process performed by disk device according to the present invention

  The features of the replacement process in the disk device according to the present invention will be described with reference to FIG.

  FIG. 1 shows an example in which data 107 is recorded in recording areas 101 and 102 secured on a disc by applying a replacement process according to the present invention. In FIG. 1, 101 is a first recording area secured on the disk, and 102 is a second recording area secured on the disk. 117 is data recorded on the disc. In the example shown in FIG. 1, the data 117 is divided into seven, the data D1 is divided into blocks 103, the data D2 is divided into blocks 104, the data D3 is divided into blocks 105, and so on. Recorded in the recording area. Each time data is recorded in one block, the quality of the recorded data is confirmed. If the quality does not reach a predetermined level, a replacement process is performed in which the data is recorded again in another block.

  In FIG. 1, since data recording is started from the block 103 of the first recording area 101 and the quality of the data D3 recorded in the block 105 is less than a predetermined level, the data recording destination is the second recording area 102. The data D3 is recorded again in the block 112, and the data after the data D4 is continuously recorded in the block 113 and the block 114 of the second recording area 102. In block 115, since the quality of the recorded data D6 did not reach a predetermined level, the data recording destination is switched to the first recording area 101, the data D6 is recorded again in the block 108, and then the data in the block 109 is recorded. D7 is recorded, and with this, all data 117 is recorded.

  As shown in FIG. 1, when the first recording area 101 and the second recording area 102 are used as the user data area, the second recording area 102 serves as a replacement area. When the second recording area 102 is used as the user data area, the first recording area 101 is in a relation to be the replacement area. Further, both areas have the same size, and each block in both areas uniquely corresponds to 103 and 110, 104 and 111, 105 and 112, and the like.

  In the conventional recording process, when the replacement process is performed, the data recording destination is switched from the user data area to the replacement area, the data is recorded in the replacement area, and then the data recording destination is the user data area that is the replacement source. Had switched to again. That is, the data recording destination has to be switched twice for one replacement process.

  On the other hand, in the recording process to which the replacement process of the present invention is applied, as shown in FIG. 1, even if the replacement process occurs, data recording continues in the replacement destination area. Therefore, since it is only necessary to switch the data recording destination once per replacement process, an efficient recording process can be realized. In addition, when data is recorded in this way, when data is reproduced, the number of times of switching the area from which data is read can be reduced, so that reproduction processing can be performed efficiently.

  In the verification process of the disk device according to the present invention, the processing time can be shortened by performing the recording quality evaluation on a part of the actually recorded data (for example, 118 in FIG. 1). For example, when performing playback from the beginning to the end of the data to evaluate the recording quality of the divided recording data, the verification processing time requires a lot of time, including the re-recording processing time according to the playback result. End up. Therefore, only a part of the recorded data is reproduced in the verify process of the present invention. As a result, if the recording quality is equal to or higher than a predetermined level, the recording quality of all the divided units is handled as good. Here, the recording quality is a predetermined level as long as the error is sufficiently corrected by the error correction code recorded at the same time when the data is recorded. On the other hand, if the recording quality is less than a predetermined level, it is treated that the recording quality of all the division units is bad.

  The recording area used in the replacement process in the disk device according to the present invention may be, for example, the same layer of the disk or a different recording layer of the multilayer disk. If the disc is rewritable, the areas may overlap. Further, for example, if a reproduction disk in which the same data is recorded in each layer of a multilayer disk is used, even if a reproduction error occurs when reproducing the data, the same data recorded in the recording area of the other layer is recorded. After playback, playback can be continued in sequence.

  An example of a disk device according to the present invention will be described below with reference to the drawings.

  The present invention can be implemented, for example, in the disk device shown in FIG.

2 includes a disk denoted by 201, an optical pickup denoted by 202, a spindle denoted by 203, a laser control means denoted by 204, a servo means denoted by 207 , an encoding means denoted by 205 , a decoding means denoted by 208 , 206 The buffer memory indicated by, control means indicated by 209, and the like.

  First, basic recording processing by the disk device according to the present invention will be described.

When data is recorded in the disk device according to the present invention, a series of data 117 to be recorded is temporarily stored in the buffer memory 206 . The control unit 209 sets the recording start position in the servo unit 207 . The servo means 207 sends a rotational speed corresponding to the recording speed to the spindle 203, sends the recording start position to the optical pickup 202, and positions the recording start position address on the disk 201. The optical pickup 202 reads the address information existing on the disk 201 and gives it to the control means 209. When the optical head position on the optical pickup 202 reaches the recording start position address, the control unit 209 sends the data 117 stored in the buffer memory 206 to the encoding unit 205 . The encoding unit 205 adds an error correction code to the data input from the buffer memory 206 , converts it into a bit string suitable for the data format of the disk 201, and converts it into a predetermined recording unit (for example, D1 to D7 in FIG. 1). The data is divided and sent to the laser control means 204. The laser control unit 204 drives the optical head with a laser power or a light emission pattern set according to the pattern of data to be recorded. As a result, the disc 201 is irradiated with a laser beam output with a desired laser power and emission pattern.

  Data recording on the disc 201 is performed by the control described above.

  Next, verification processing by the disk device of the present invention will be described.

In the verify process according to the present invention, immediately after the predetermined recording unit data is recorded by the recording process, the data is reproduced and the recording quality is confirmed. When reproducing data, the control unit 209 controls the servo unit 207 in the same manner as the recording process described above, and after positioning the optical pickup 202 at the reproduction start position, the laser on the optical head emits light with a desired reproduction power. The laser control means 204 is controlled. The laser control means 204 irradiates a laser beam that emits light with a desired reproduction power. The light spot of the irradiated laser beam is condensed from the disk 201 at a position where data is to be reproduced. The reflected light of the laser beam irradiated on the disk 201 is converted into an electric signal by the light receiving element of the optical pickup 202 or the like. The electric signal is subjected to analog signal processing such as signal amplitude adjustment and then subjected to digital signal processing such as binarization processing, and then converted into digital data that is a bit string of 0 and 1. The converted data is input to the decoding means 208 . The decoding means 208 removes the error correction code from the input digital data and converts it into a bit string according to the data format of the disk 201. Further, the control unit 209 acquires a quality evaluation index value from the reproduction signal obtained by the reproduction process, and compares the value with a predetermined threshold value.

  Here, when the quality evaluation index value exceeds the threshold value, the control unit 209 determines that the recording quality of the verified area is good, and performs data recording processing on the currently recorded area on the disc 201. Continue. On the other hand, if the quality evaluation index value is below the threshold value, the control unit 209 determines that the recording quality of the area where the verification has been performed is poor, and enters a replacement process. Here, the replacement process by the disk device according to the present invention will be described with reference to FIG.

  FIG. 3 shows an example of the replacement process of the present invention. In FIG. 3, 301 is a series of data to be recorded divided from D1 to D7, LA1 is a logical address of data D1, LA2 is a logical address of data D2, LA3 is a logical address of data D3, and so on. A logical address is assigned to each divided unit. Reference numeral 302 denotes a first recording area secured on the disc 201, and 303 denotes a second recording area secured on the disc 201. Also, PA1 to PA7 and PA11 to PA17 in both areas indicate physical addresses, and each address uniquely corresponds to PA1, PA1 is PA12, PA3 is PA12, and so on.

  In this embodiment, the area where data recording is started may be determined in advance from a plurality of reserved recording areas. In FIG. 3, first, the recording process is started for the first recording area 302. The address LA1 of the data D1 to be recorded first is converted into the address PA1 on the first recording area by the control means 209. The control means 209 sends the converted address PA1 to the servo means 205, and the data D1 is recorded on the address PA1. Similarly, the data after the data D2 is continuously recorded at the address PA2 and the address PA3 in the first recording area 302. The control means 209 controls each component in FIG. 2 to reproduce the recorded data immediately after recording each data, and confirms the recording quality. As a result, when the recording quality does not reach the predetermined level, the control unit 209 controls the replacement process to another area. In the example of FIG. 3, the data D3 is re-recorded from the address PA3 of the first recording area 302 that is the replacement source to the PA 13 of the second recording area 303 that is the replacement destination. At this time, the address PA3 as the replacement source and the address PA13 as the replacement destination are registered and managed in, for example, a DFL (Defect List) on the disk as indicated by 304 in FIG. This address registration is performed each time a replacement process occurs. The configuration of the DFL used in the present invention may be the same as that of the conventional configuration, and only the usage method is different. Therefore, the method of using the DFL according to the present invention may be determined at the time of formatting, for example.

  The replacement process control as shown in FIG. 3 is realized by the control of the control means 209. When the evaluated recording quality is higher than a predetermined level, the control unit 209 determines that the current recording area is the first recording area, the first recording area, or the second recording area is the second recording area. If the recording quality evaluated is lower than a predetermined level, if the currently recorded area is the first recording area, the second recording area or the second recording area Then, control is performed to instruct to record the same data as the evaluated data in the first recording area, and the replacement process shown in FIG. 3 is realized.

  When reproducing data, the control means 209 reads out the recorded data while referring to the DFL. For example, when reproducing a series of data recorded as shown in FIG. 3, it is assumed that the control means 209 reproduces the data D3 of the address PA3 registered as the replacement source. At this time, since the recording quality of the data D3 does not satisfy the predetermined level, there is a high possibility that a reproduction error will occur. Therefore, the control unit 209 determines an address to be reproduced next based on the reproduction result of the data D3 recorded in the replacement source. If the data D3 recorded at the replacement address PA3 is successfully reproduced, the control unit 209 reproduces the data D4 at the address PA14 recorded next to the replacement address PA13. On the other hand, when the reproduction of the data D3 at the address PA13 fails, the control unit 209 reproduces the data D3 at the address PA13 that is the replacement destination. This process is performed every time the replacement source address registered in the DFL is reproduced. By performing such a reproduction process, a series of data recorded according to the present invention is sequentially reproduced.

  As described above, in the disk device according to the present invention, a plurality of uniquely corresponding recording areas are secured, and the recording areas are switched only when the quality of the recording data is less than a predetermined level. For this reason, after switching the recording area to the replacement destination area and re-recording the data by the replacement process, there is no need to return to the recording area of the replacement source, and the recording area can be switched by continuing the recording to the replacement destination area. The number of times can be reduced, and an efficient recording process can be realized. Further, by reproducing the data recorded in this way, the number of times of switching the area from which the data is read can be reduced, so that an efficient reproduction process can be similarly realized.

101 ... 1st recording area, 102 ... 2nd recording area,
103 to 116: Block area 117: Recording data, 118: Verify area,
201 ... disc, 202 ... optical pickup,
203 ... Spindle, 204 ... Laser control means,
207 ... Servo means, 205 ... Encoding means,
208 ... decoding means, 206 ... buffer memory,
209 ... control means,
301 ... recording data, 302 ... first recording area,
303: second recording area, 304: DFL (Defect List)

Claims (5)

A disk device that performs a replacement process,
A first recording area and a second recording area are secured on the disc, the second recording area is used as a replacement area of the first recording area, and the first recording area is the second recording area. Means as a replacement area;
Recording means for recording data in a predetermined recording unit with respect to the first recording area or the second recording area;
The data recorded by the recording means is reproduced for each recording unit, the recording quality of the recorded data is evaluated, and the recording area recorded by the recording means according to the evaluated recording quality is defined as the first recording area. Or control means for switching between the second recording area and the second recording area;
With
The control means includes
If the evaluated recording quality is higher than a predetermined level,
For the recording means, if the currently recorded area is the first recording area, the data is the same as the first recording area, and if it is the second recording area, the data is the same as the second recording area. Instructed to continue recording in the area ,
If the evaluated recording quality is lower than a predetermined level,
For the recording means, if the currently recorded area is the first recording area, the evaluation is made to the second recording area, and if it is the second recording area, the evaluation is made to the first recording area. A disk device characterized by executing control for instructing to record the same data as data by switching areas. The disk device according to claim 1,
The disc device characterized in that the control means reproduces a part of the predetermined recording unit data recorded by the recording means and confirms the recording quality of the data of the predetermined recording unit. The disk device according to claim 1,
The control means refers to a management table for registering an address as a replacement source and an address as a replacement destination at the time of reproducing data, and depending on the reproduction result of the data recorded at the address registered as the replacement source, A disk device characterized by determining an address to be reproduced. The disk device according to claim 1,
A disc apparatus characterized in that the first and second recording areas are provided in the same layer of the disc. The disk device according to claim 1,
The disk device according to claim 1, wherein the first and second recording areas are provided in different layers of the multilayer disk.

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