JP2011044203A - Disk device and disk recording test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce memory access using any test pattern in a recording test of a recording disk, such as an optical disk and a hard disk. <P>SOLUTION: A disk device (100) includes: a memory (40) which stores test data and an error detection code for detecting an error of test data; a media interface (201) which reads the test data written from the recording disk, and stores it in the memory (40), after reading the test data from the memory (40) and writing it in the recording disk; and an error processing part (202) which reads the test data stored in the memory (40) from the memory (40) by the error detection code and the media interface (201), and detects by the error detection code, the error of the test data stored in the memory (40) by the media interface (201). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a disk device, and more particularly to a data recording test for a recording disk such as an optical disk or a hard disk.

  In recent years, AV recording / reproducing devices using high-speed and large-capacity recording disks such as optical disks and hard disks are rapidly spreading. In order to record and reproduce large-volume information with higher image quality and higher sound quality on a recording disk, it is necessary to maintain the recording reliability from the disk device to the recording disk at a high level. As a general method to improve the recording quality on the recording disk, before recording the main content data on the recording disk, write the test pattern data on the recording disk, read it, and read the expected result. There is a calibration that tunes control parameters such as a header for recording (see, for example, Patent Document 1). Specifically, the test pattern is developed in the memory of the drive control system and written to the recording disk, and the written test pattern is read from the recording disk and developed in another area of the memory. Evaluate and reflect this in tuning.

  In the disk device, the optimum control parameter varies depending on conditions such as variations in recording disk, temperature, voltage, and the like. For this reason, calibration must be performed not only at the time of factory shipment, but also immediately before the content is written to the recording disk under normal use conditions. The problem here is that the time allowed for calibration is short under normal use conditions. In particular, in a system that simultaneously processes recording and reproduction on a recording disk, data cannot be read from the recording disk during calibration at the start of recording. As a result, the reproduction operation is delayed and a fatal situation such as a disturbance of the reproduction image occurs. In order to avoid such a situation, it is necessary to sufficiently shorten the time required for calibration. Therefore, by writing arbitrary data and parity as a test pattern to the recording disk, reading the written test pattern from the recording disk and inputting it to the error correction circuit, data can be obtained while ensuring the same reliability as in the data comparison. Some have reduced the transfer amount to shorten the time required for calibration (see, for example, Patent Document 2).

JP-A-3-250442 Japanese Patent Laid-Open No. 10-106178

  Since the parity is uniquely determined depending on the data, if the parity is included in the test pattern, the test pattern cannot be developed freely. Therefore, it is difficult to confirm the recording quality using a test pattern that is more difficult to record. On the other hand, if the test pattern can be developed freely, some patterns do not satisfy the logical structure that can be corrected by themselves. There is a need to do. Therefore, the test pattern and the expected value of the same data amount are transferred inside the system, which consumes a lot of memory bandwidth resources and takes a lot of time.

  Furthermore, in the conventional recording / reproducing system, calibration can be performed by making full use of the dedicated LSI for drive control. However, as the scale of the system LSI and integration of functions have progressed, the drive control function has been dedicated. It is becoming mounted as a partial block of a system LSI that realizes a recorder system instead of an LSI. For this reason, the memory bandwidth and CPU resources that can be used for realizing the drive control must be smaller than those realized by the dedicated LSI. If calibration based on simple data comparison is performed in such a system, the processing time may be significantly increased due to restrictions on memory bandwidth and CPU resources. In order to solve this, even if DMA (Direct Memory Access) transfer is adopted, there is only a margin in CPU resources, and the amount of data transfer does not change, so that insufficient memory bandwidth is not improved. In addition, another problem such as an increase in circuit scale arises.

  In view of the above problems, an object of the present invention is to reduce memory access while using an arbitrary test pattern in a recording test of a recording disk such as an optical disk or a hard disk.

  In order to solve the above problems, the present invention has taken the following measures. That is, as a disk device, a test data and a memory for storing an error detection code for detecting an error in the test data, and reading the test data from the memory and writing it to the recording disk, and then reading the test data written from the recording disk Error that detects the error in the test data stored in the memory by the media interface by reading the error detection code and the test data stored in the memory by the media interface from the memory And a processing unit.

  According to this, since the error of the test data read from the recording disk is detected using the error detection code, the amount of data to be transferred to the error processing unit can be reduced compared with the case of simple data comparison. Moreover, since it is not necessary to record the error detection code on the recording disk, any pattern that is not bound by the restriction of the inner code correction can be used as the test data.

  In addition, as a disk device, a test data and a memory for storing an error detection code for detecting an error in the test data, and a test written from the recording disk after reading a part of the test data from the memory and writing it to the recording disk Media interface that reads data and stores it in memory, error detection code from memory, test data stored in memory by media interface, and remainder of test data that was not written to recording disk by media interface, and error detection The code detects an error in the test data connecting the test data stored on the recording disk by the media interface and the rest of the test data that was not written to the recording disk by the media interface. Assume that a error processing unit.

  According to this, since the error of the test data read from the recording disk is detected using the error detection code, the amount of data to be transferred to the error processing unit can be reduced compared with the case of simple data comparison. Moreover, since it is not necessary to record the error detection code on the recording disk, any pattern that is not bound by the restriction of the inner code correction can be used as the test data. Further, since a part of the test data is written to the recording disk, the recording test can be performed with the data size per data read / write operation with respect to the recording disk regardless of the size of the test data.

  According to the present invention, memory access can be reduced while using an arbitrary test pattern in a recording test of a recording disk such as an optical disk or a hard disk. As a result, it is possible to increase the speed of the test for confirming the reliability of the data transmission system and the speed of the recording test of the recording disk.

1 is a configuration diagram of a disk device according to an embodiment of the present invention. It is a flowchart of an example of a disk recording test. It is a flowchart of another example of a disk recording test. It is a block diagram of the disc apparatus which concerns on a modification.

  FIG. 1 shows a configuration of a disk device according to an embodiment of the present invention. A disk device 100 according to this embodiment includes a CPU (Central Processing Unit) 10, a pre-processing unit 20, a post-processing unit 30, a memory 40, and the like. The disc device 100 exchanges data with a recording disc 200 such as a DVD (Digital Versatile Disc) via the pre-processing unit 20, and image information and audio with the outside via the post-processing unit 30. Input and output information. The pre-processing unit 20 includes a media interface 201 that writes data to and reads data from the recording disk 200, an error processing unit 202 that detects and corrects errors in the main data read from the recording disk 200, from the redundant data for error correction, and a post-processing unit 30 includes a post-stage interface 203 for exchanging data with 30. The memory 40 is a memory that is accessed by the CPU 10, the pre-processing unit 20, and the post-processing unit 30.

  Details of the disk recording test by the disk device according to this embodiment will be described below.

<Disc recording test example 1>
FIG. 2 shows a flow of an example of a disc recording test. First, the CPU 10 develops test data and an error detection code in the memory 40 (S1). The error detection code is such that an error in the test data can be detected by the error processing unit 202, such as a parity code or a CRC (Cyclic Redundancy Check) code. Next, the media interface 201 reads the test data from the memory 40 and writes it to the recording disk 200 (S2). Preferably, the test data is written in a plurality of different areas of the recording disk 200, and in this example, the test data is written in three different areas. Thereafter, the media interface 201 reads out the written test data from three different areas of the recording disk 200 and stores them in the memory 40 (S3). Thereafter, the CPU 10 transfers each of the test data read from the three different areas of the recording disk 200 and stored in the memory 40 to the error processing unit 202 together with the error detection code (S4). The error detection unit 202 detects errors in the three test data using the error detection code (S5). The error detection unit 202 notifies the CPU 10 when an error is detected.

  For example, let us consider a case where data is read from or written to a DVD standard optical disk in units of ECC (Error Correction Code) blocks. In the DVD standard, inner code correction is performed on 172 bytes of data with 10 bytes of parity. The size of one ECC block is 208 lines of data and parity, that is, 182 × 208 = 37856 bytes. Therefore, one ECC block can be packed with 172 bytes of data up to 220 rows, that is, 172 × 220 = 37840 bytes. Therefore, a set of 172 bytes of test data and 10 bytes of parity is expanded in the memory 40 for 220 rows, of which 220 rows of test data are written to the optical disk and read out, and the error processor 202 along with the parity of 220 rows. Forward to. Therefore, the data transfer amount from the memory 40 related to the disk recording test to the error processing unit 202 is 172 × 220 + 10 × 220 = 40040 bytes.

  On the other hand, when a recording test of 172 × 220 = 37840 bytes of test data is performed by a conventional simple data comparison method, an expected value having the same size as the test data needs to be transferred from the memory 40 to the error processing unit 202. 37840 × 2 = 75680 bytes of data transfer is required. Therefore, according to the present embodiment, it is possible to reduce the memory access by about 47% compared to the conventional case.

<Disc recording test example 2>
In the disk recording test example 1, the data read / write unit for the recording disk 200 is 37856 bytes, whereas the size of the test data to be subjected to write verification is 37840 bytes, which is smaller than that. That is, write verification is not performed for 16 bytes of test data. Accordingly, consider 100% verification of the test data written on the recording disk 200.

  FIG. 3 shows a flow of another example of the disk recording test. First, the CPU 10 develops test data including padding data and an error detection code in the memory 40 (S1A). The error detection code is such that an error in the test data can be detected by the error processing unit 202, such as a parity code or a CRC (Cyclic Redundancy Check) code. Next, the media interface 201 reads test data excluding padding data from the memory 40 and writes it to the recording disk 200 (S2A). Preferably, the test data is written in a plurality of different areas of the recording disk 200, and in this example, the test data is written in three different areas. Thereafter, the media interface 201 reads out the written test data from three different areas of the recording disk 200 and stores them in the memory 40 (S3). Thereafter, the CPU 10 transfers the data obtained by connecting the padding data to each of the test data read from the three different areas of the recording disk 200 and stored in the memory 40 together with the error detection code to the error processing unit 202 (S4A). . The error detection unit 202 detects errors in the three test data using the error detection code (S5). The error detection unit 202 notifies the CPU 10 when an error is detected.

  For example, consider a case where data is read and written in sector units on a DVD standard optical disc. In the DVD standard optical disk, the size of one sector is 1/16 of one ECC, that is, 37856/16 = 2366 bytes. Accordingly, 172 bytes of data can be packed into 13 sectors, that is, 172 × 13 = 2236 bytes in one sector. Therefore, a set of 172 bytes of test data and 10 bytes of parity is expanded in the memory 40 for 14 rows, of which the test data for 13 rows and the test data for the 14th row are up to the 130th byte, that is, one sector. The test data of 172 × 13 + 130 = 2366 bytes which is the same as the size is written to the optical disc. For example, 131 bytes after the 14th row not written on the optical disc are all zero padding data. Then, all the 2366-byte test data written on the optical disk is read, and the 42-byte padding data is concatenated and transferred to the error processing unit 202 together with the parity of 14 rows. Therefore, the data transfer amount from the memory 40 related to the disk recording test to the error processing unit 202 is 2366 + 42 + 10 × 14 = 2548 bytes.

  On the other hand, when a recording test of 2366 bytes of test data is performed by a conventional simple data comparison method, it is necessary to transfer an expected value of the same size as the test data from the memory 40 to the error processing unit 202, so 2366 × 2 = 4732 bytes of data transfer is required. Therefore, according to the present embodiment, it is possible to reduce the memory access by about 46% compared to the conventional case.

  When the disk device 100 includes the DMA transfer unit 204 as shown in FIG. 4, data transfer from the memory 40 to the error processing unit 202 is performed in step S4 in FIG. 2 and step S4A in FIG. You may perform directly, without going through CPU10. By transferring the data from the memory 40 to the error detection unit 202 by DMA, the CPU 10 can perform another process in step S4 of FIG. 2 and step S4A of FIG. 3, and can speed up the entire calibration operation. . Further, since the DMA transfer unit 204 is normally provided in the disk device 100, the circuit scale does not increase.

  Since the disk device according to the present invention can efficiently perform a highly reliable recording test on a recording disk, it is useful as a disk recording / reproducing device that simultaneously performs recording and reproduction.

100 disk device 201 media interface 202 error processing unit 204 DMA transfer unit 40 memory

Claims (12)

A memory for storing test data and an error detection code for detecting an error in the test data;
A media interface that reads the test data from the memory and writes the test data to a recording disk, and then reads the written test data from the recording disk and stores it in the memory;
An error processing unit that reads the error detection code and the test data stored in the memory by the media interface from the memory, and detects an error in the test data stored in the memory by the media interface using the error detection code And a disk device. The disk device according to claim 1, wherein
The media interface is for writing and reading the test data to and from a plurality of areas of the recording disk,
The disk apparatus according to claim 1, wherein the error processing unit detects an error in each of a plurality of test data read by the media interface. The disk device according to claim 1, wherein
A disk device comprising a DMA transfer unit for transferring data from the memory to the error processing unit by DMA (Direct Memory Access). A memory for storing test data and an error detection code for detecting an error in the test data;
A media interface that reads a part of the test data from the memory and writes the test data to a recording disk, and then reads the written test data from the recording disk and stores it in the memory;
Reading the error detection code from the memory, test data stored in the memory by the media interface, and the rest of the test data not written to the recording disk by the media interface, the error detection code, An error processing unit for detecting an error in the test data obtained by connecting the test data stored on the recording disk by the media interface and the rest of the test data not written on the recording disk by the media interface; A disk device characterized by the above. The disk device according to claim 4, wherein
The media interface performs writing and reading of a part of the test data with respect to a plurality of areas of the recording disk,
The disk apparatus according to claim 1, wherein the error processing unit detects an error in each of a plurality of test data read by the media interface. The disk device according to claim 4, wherein
A disk device comprising a DMA transfer unit for transferring data from the memory to the error processing unit by DMA (Direct Memory Access). A first step of reading the test data out of the test data stored in the memory and an error detection code for detecting an error in the test data and writing it to a recording disk;
A second step of reading the test data written in the first step from the recording disk and storing it in the memory;
And a third step of detecting an error in the test data stored in the memory in the second step using the error detection code. The disc recording test method according to claim 7, wherein
In the first step, the test data is written in a plurality of areas of the recording disk,
In the second step, the test data written in the first step is read from a plurality of areas of the recording disk,
In the third step, an error in each of the plurality of test data read in the second step is detected. The disc recording test method according to claim 7, wherein
In the third step, the error detection code and test data stored in the memory in the second step are transferred by DMA (Direct Memory Access). A first step of reading a part of the test data out of the test data stored in the memory and an error detection code for detecting an error in the test data and writing it to a recording disk;
A second step of reading test data written in the first step from the recording disk;
The error detection code detects an error in the test data obtained by connecting the test data stored in the memory in the second step and the rest of the test data not written in the recording disk in the first step. A disc recording test method comprising: a third step of: The disc recording test method according to claim 10, wherein
In the first step, a part of the test data is written in a plurality of areas of the recording disk,
In the second step, the test data written in the first step is read from a plurality of areas of the recording disk,
In the third step, a plurality of test data obtained by concatenating the plurality of test data read in the second step and the rest of the test data not written to the recording disk in the first step A disc recording test method characterized by detecting each error. The disc recording test method according to claim 10, wherein
In the third step, the error detection code, the test data stored in the memory in the second step, and the remainder of the test data not written to the recording disk in the first step are DMA ( Direct Memory Access) A disk recording test method characterized by transferring data.

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