JP2011134398A - Optical disk device and method of temporarily storing data of optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of improving speed of transmitting data read from an alternative area of an optical disk to a host. <P>SOLUTION: The optical disk device includes: a main buffer 21 temporarily storing the data read from a main area that is a main data writing area on the optical disk; an alternative area buffer 22 temporarily storing data read from an alternative area for alternatively recording the data when the main area includes a defect and cannot be used; and a memory controller 23 moving the data of the alternative area buffer 22 to the main buffer 21 in accordance with an instruction from a CPU 25. Accordingly, data transmission to the host is performed from only the main buffer 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus and an optical disc data temporary storage method.

  Some optical disks employ defect management as a countermeasure against defective blocks on the disk, detecting and registering defective blocks, and writing the replacement blocks in a replacement area (replacement sector).

  Conventionally, an optical disk apparatus adopting this defect management has a substitute sector buffer for temporarily storing only the contents of the substitute area in addition to a transfer buffer for reading and temporarily storing (cache) a normal area. There is something. According to the apparatus, when the transfer buffer becomes full, the reading speed is improved by reading the contents of the alternative area into the alternative sector buffer even before reaching the defective sector. (Patent Document 1).

JP 2002-184117 A

  However, in the conventional technique, since the contents of the alternative area are temporarily stored in the alternative sector buffer different from the transfer buffer, when the host apparatus (host) requests to transmit the defective area data, It is necessary to switch from transmission from the transfer buffer to transmission from the alternative sector buffer.

  For this reason, there is a problem that a time loss occurs when the temporarily stored data is sent out to the host device that has requested reading.

  Accordingly, an object of the present invention is to provide an optical disc apparatus and an optical disc temporary storage method capable of improving the speed at which data read from an alternative area of the optical disc is transmitted to the host side.

  To achieve the above object, an optical disk apparatus according to the present invention includes a first buffer for temporarily storing data read from a main area which is a main data writing area on an optical disk, and a portion in which the main area is defective and cannot be used. A second buffer for temporarily storing data read from an alternative area for recording the data to be recorded in the unusable portion, and a control for moving the data in the second buffer to the first buffer And means.

In order to achieve the above object, a method for temporarily storing an optical disk according to the present invention comprises a step of temporarily storing data read from a main area, which is a main data writing area on the optical disk, in a first buffer; When data reaches the specified capacity, or when the data read position from the main area reaches a defective address indicating that the defect exists and cannot be used, the data is recorded in place of the defective address. A method for temporarily storing data in an optical disc, comprising: reading data from an area and temporarily storing the data in a second buffer; and moving the data in the second buffer to the first buffer. In the present invention, data once read to the second buffer is also moved to the first buffer. For this reason, data transmission to the host need only be performed from the first buffer.

  According to the present invention, since data transmission to the host device need only be performed from the first buffer, the data transmission speed to the host side including data read from the alternative area can be improved.

It is a block diagram which shows the optical disk apparatus of this embodiment. It is explanatory drawing for demonstrating the recording area of the optical disk for demonstrating defect management. It is explanatory drawing which shows an example of DFL used by defect management. 5 is a flowchart showing an operation procedure of the optical disc apparatus according to the present embodiment. FIG. 5 is a flowchart illustrating an operation procedure of the optical disc device according to the present embodiment, following FIG. 4. FIG. FIG. 6 is an explanatory diagram for explaining the processing according to the procedure shown in FIGS. 4 and 5 using an address on the optical disc as an example. It is explanatory drawing explaining the case where the main buffer becomes full before reaching the defect on an optical disk. FIG. 7 is an explanatory diagram showing a state in which address data on the optical disc according to the example of FIG. 6 is temporarily stored in a main buffer.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The optical disc apparatus according to the present embodiment includes a recordable Blu-ray disc (hereinafter referred to as BD; BD includes BD-RE, BD-R, etc.) and a compact disc (hereinafter referred to as CD. CD includes CD-ROM, CD- R, CD-RW, etc.), digital multipurpose disc (hereinafter referred to as DVD, DVD includes DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD-RAM, etc.) It can be applied to those adopting the used defect management.

  FIG. 1 is a block diagram showing an optical disc apparatus according to this embodiment. The configuration of the control device for recording / reproduction other than that shown here may be the same as the configuration of the device for recording and reproduction on each optical disk described above, and is a well-known configuration, and thus the description thereof is omitted.

  The optical disk apparatus shown in FIG. 1 first includes a decoder 11 that demodulates a signal from an RF unit (not shown) that extracts a signal from reflected light from an optical disk as a part related to basic reading, and an address of the read data. Address register 12 for temporarily storing, comparator 13 (comparator) for comparing the read address with the defective address, defective address buffer 14 for temporarily storing a defective address (defective address), interface 15 for communicating with the host, defect It has a DFL memory 16 in which a defect list (DFL; Defect List) for management is recorded. Then, as a part related to temporary storage, a main buffer 21 (first buffer) for temporarily storing the pre-read data in order, an alternative area buffer 22 (second buffer) for temporarily storing alternative area data, and these buffer memories A memory controller 23 for controlling the input / output of the data, and a CPU 25 for controlling the whole. Here, as the main buffer 21 and the alternative area buffer 22, for example, a ring buffer is used. In this apparatus, the CPU 25 and the memory controller 23 serve as control means.

  The general operation of this optical disc apparatus is as follows.

  A signal extracted as an RF signal from the optical disk is demodulated by the decoder 11. If there is no error at this time, a temporary storage request is issued from the decoder 11 to the memory controller 23, and the demodulated data is transferred to the main buffer 21 or the alternative area buffer 22 as specified by the CPU 25. The operation of the CPU 25 here will be described later. The address data is also demodulated from the RF signal and stored in the address register 12 if there is no error. These operations are executed without the intervention of the CPU 25 except for the designation of the buffer.

  The address of the address register 12 is compared with the address in the defective address buffer 14 by the comparator 13 (actually, it is the address immediately before the address in the defective address buffer 14, which will be described in detail later). The defective address buffer 14 temporarily stores a defective address described in the DFL based on the DFL in the DFL memory 16 by the CPU 25. If they match as a result of the comparison, two operations are performed according to a command from the CPU 25. The first is a demodulation stop mode in which demodulation is stopped when a defective address is reached. At this time, an interrupt (Interrupt) is issued to the CPU 25 to notify the temporary stop, and data in an alternative area (described later) is immediately read out. The second is a demodulation non-stop mode in which demodulation operation is continued without stopping demodulation even when a defective address is reached. This is a mode for tracing the pickup without removing it from the user area by not stopping the demodulation operation. As a result, reading after the defective portion can be immediately continued.

  Then, the data stored in the alternative area buffer 22 is moved (or copied) to the main buffer 21 at a timing when data is read from a defective portion in the user area (described later).

  When data is requested from the host, the request is notified to the CPU 25 via the interface 15, and the CPU 25 transmits the requested data from the main buffer 21 to the host via the interface 15. Therefore, all data to be transmitted to the host is transmitted from the main buffer 21. Therefore, it is not necessary to switch the buffer to be transmitted at the time of data transmission to the host or to search for the data to be transmitted from the alternative area buffer 22, and the time loss can be eliminated and the data can be sent out at high speed.

  Here, the host refers to a host device that has requested reading of data from the optical disk, and is not particularly limited.

  The operation of this optical disk apparatus will be further described below, but the defect management will be briefly described before the operation description. Defect management used in the present embodiment is conventionally performed. FIG. 2 is an explanatory diagram for explaining a recording area of an optical disc for explaining defect management. FIG. 3 is an explanatory diagram showing an example of a DFL used in defect management.

  In an optical disc adopting defect management, the user area (main area), which is the main data writing area, is used as the recording area, and the alternative area (alternately) where data to be recorded is recorded in the unusable part of the user area. Sometimes called area).

  For example, as shown in FIG. 2, assume that the user area addresses are 35000, 35050, 35020, 35030, and 35040, and the alternative area addresses are 300E0, 300F0, and 30100. Here, it is assumed that 35010 and 35030 have defects (in the figure, defective addresses are indicated by crosses). Then, the data to be written at the defective address is written by specifying the addresses 30100 and 300F0 of the alternative area. The relationship between the address (defective address) of the user area to be originally written and the address (alternative address) of the alternative area where data is written instead is described in the DFL as shown in FIG.

  When reading such a defective optical disc, the addresses in the user area are read in order, and when the defective address in the DFL is reached, a seek to read the alternative area is performed and the data of the alternative address is read. . For this reason, if an alternative address is read every time a defective address is reached, four large seek operations are required in this example. Seek from 35000 to 30100, seek from 30100 to 35020, seek from 35020 to 300F0, seek from 300F0 to 35040. For this reason, it takes time to read data.

  Next, the operation of this embodiment will be described in detail. 4 and 5 are flowcharts showing the operation procedure of the optical disc according to the present embodiment.

  First, when a read command is received from the host, the CPU 25 finds the latest defective address from the address specified by the command from the DFL. The found defective address is set in the defective address buffer 14. Further, a demodulation stop mode for stopping demodulation when the function setting comes to the defective address is set (S1). As a result, the demodulation operation stops when the defect address in the user area is reached.

  Then, the pickup is sought to the address of the user area instructed by the read command and moved to the reading position, and the signal read therefrom is demodulated, and the demodulated data is stored in the main buffer 21 (S2). This is because the data of the address ahead of the address instructed by the host is read in order from the address at which the host instructed to read it first.

  If the demodulation operation stops halfway (S3: Yes), it is determined whether or not the main buffer 21 is full (when the capacity is full or when a predetermined capacity value is reached) (S11). If the buffer is full (S11: Yes), no more data can be written to the main buffer 21, and the user area cannot be read any more. For this reason, the demodulation operation stops. In this state, the reading operation is freed up (free time is available). In the present embodiment, the spare area data is prefetched using the free time when such a state occurs.

  For this purpose, the CPU 25 determines whether or not there is a free space in the alternative area buffer 22 (abbreviated as “alternative buffer” in the figure) (S12). If there is no space in the alternative area buffer 22, the process moves to S15.

  If the alternative area buffer 22 is empty (S12: Yes), the data of the alternative area that can be stored is read from the alternative area, demodulated, and stored in the alternative area buffer 22 (S13). The determination as to whether or not it has been stored is that the alternative area buffer 22 is full, or that the main buffer 21 has more space than predetermined (that is, accumulation by prefetching in the main buffer 21 can be resumed). Or the address of the data requested from the host has come to just before the address stored in the main buffer 21.

  Thereafter, the CPU 25 sets a destination address of the main buffer 21 for the data stored in the alternative area buffer 22, and sets a demodulation non-stop mode in which the demodulation is not stopped even when the defective address is reached (S14). In this process, when the former moves the substitute address data read into the substitute area buffer 22 by referring to the DFL to the main buffer 21, the defective address of the original user area is replaced with the substitute address data. It is related. As a result, the position to which the data stored in the alternative area buffer 22 should be moved when the data is moved to the main buffer 21 is set. In the latter process of S14, data is accumulated in the substitute area buffer 22 at this stage, so that it is not necessary to seek the pickup in the substitute area even if the defect address is reached in the future. Thus, the data at the address next to the defective address can be read immediately.

  Subsequently, in S11, seek to the address next to the original address of the user area when the pickup is separated from the user area and wait for the main buffer 21 to be freed (S15), and the process returns to S2. Note that while waiting for the main buffer 21 to become free in S15, the demodulation operation is also stopped, but the cause of this stop is not due to a defective address, so the procedure here does not have to proceed. Good. If S12 is No and the process has arrived at S15, the pickup has not sought into the alternative area, so only a wait is made in the main buffer 21 and no seek operation occurs.

  In S11, when the main buffer 21 is not full (S11: No), it is determined whether or not the seek position has reached the defective address (S21). The comparator 13 determines whether or not the defective address has been reached. In fact, there is a high possibility that the address cannot be demodulated from the defective address itself. For this reason, the comparator 13 determines whether or not the defective address has been reached by comparing the address immediately before the defective address stored in the defective address buffer 14 with the address of the address register 12.

  Here (after determining whether or not the main buffer 21 is full in S11), if it is determined that the seek position has reached the defective address (S21: Yes), if there is an empty space in the alternative area buffer 22 (S22: Yes), an alternative area including an alternative address for substituting for an address where a defect is found is read as much as the free space in the alternative area buffer 22 (S23). As a result, data other than the data of the alternative address corresponding to the defective address matched in S21 is read from the alternative area buffer 22 one after another. In the optical disc, the alternative area is at the innermost or outermost circumference of the optical disc, so that it takes time to read when performing a seek operation that frequently moves between the user area and the alternative area. Therefore, in this embodiment, if it is necessary to seek to the alternative area, as much data as possible is prefetched from the alternative area. As a result, the seek operation for moving between the user area and the alternative area every time a defective address is encountered is reduced, and the reading operation can be speeded up.

  Then, the alternative address data read instead of the defective address in accordance with an instruction from the CPU 25 is moved from the alternative area buffer 22 to the main buffer 21 (S24). The data movement itself moves from the substitute area buffer 22 to the main buffer 21 in accordance with an instruction from the memory controller.

  Thereafter, as in S14, the CPU 25 sets the destination address of the main buffer 21 for the data stored in the alternative area buffer 22, and sets the demodulation non-stop mode in which the demodulation is not stopped even when the defective address is reached. (S25). Then, the process returns to S2.

  If S21 is No, there are other causes for the demodulation stop, so the process for that ("other process" in the figure) is performed. If the demodulation stop can be resolved, the process returns to S2, but if the recovery cannot be recovered, the process is defective. It ends due to abnormalities such as.

  On the other hand, if the demodulation does not stop in S3, that is, the operation after the demodulation non-stop mode is set in S14 or 25. In this case, it is determined whether or not the read position has reached the defective address (S31). This process is determined by the comparator 13. Here, in practice, as in S21, the determination is made by comparing the address in the address register 12 with the previous address stored in the defective address buffer 14. If the defective address has not been reached, the procedure returns to S2 and continues to store data in the main buffer 22 as it is.

  If the defect address has been reached (S31: Yes), a signal to that effect is output from the comparator 13 to the CPU 25. Then, the CPU 25 instructs the memory controller 23 to move the data in the alternative area buffer 22 to the main buffer 21 (S32). At this time, the data in the alternative area buffer 22 is moved to a position in the main buffer 21 where the data of the defective address is stored with reference to the defective address of the user area associated in S14 or S25. Here, the data of the address immediately before the defective address determined when the defective address is reached is stored in the main buffer 21, and the position of the main buffer where the next defective address data is to be received is empty. Therefore, the corresponding data in the alternative area buffer 22 is moved there.

  As a result, data to be read by the main buffer 21 is moved from the substitute area buffer 22 to the main buffer 21. Since the pickup seek position is not far from the user area, it is possible to skip the defective address and immediately read the next address. That is, in this case, even if there is a defective address, seek to the alternative area does not occur.

  Thereafter, the CPU 25 sets the next defective address from the DFL in the defective address buffer 14 (S33).

  Thereafter, it is determined whether or not there is other data in the alternative area buffer 22 (S34), and if there is other data (S34: Yes), that is, data of another alternative address is stored in the alternative area buffer 22. If there is, the procedure returns to S2. Therefore, in this case, the demodulation non-stop mode is continued.

  On the other hand, if there is no other data in the alternative area buffer 22 (S34: No), the demodulation stop mode is set (S35), and the procedure returns to S2. This is because there is no other data in the substitute area buffer 22, so that the demodulation is stopped and the substitute area data is read when the next defective address is reached (the processes of S21 to S25 are executed). For).

  The operation by the above processing will be described with an address on the optical disk as an example. FIG. 6 is an explanatory diagram for explaining the processing according to the above procedure using an address on the optical disc as an example.

  First, read 35000 requested by the first seek. Also, 35010 is set in the defective address buffer 14 from the DFL to set the demodulation stop mode.

  Subsequently, the next address (35010) is acquired and compared with the address of the defective address buffer 14 (actually compared with the previous address). In the example of FIG. 6, the demodulation stops because they match. Here, seek to the alternative area and read the data of the alternative address. At this time, if there is an empty space for three addresses in the alternative area buffer 22, 30100 which is originally necessary is read, and the subsequent 300F0 and 300E0 are also read simultaneously.

  Then, 30100 data that must be replaced is moved to the main buffer 21. Also, the demodulation non-stop mode is set, seek is performed at address 35020, and demodulation is resumed.

  Subsequently, the address 35020 is read into the main buffer 21 as usual. Subsequently, since the address 35030 coincides with the address of the defective address buffer 14, the data movement function is activated, and the interrupt 25 is notified to the CPU 25 at the same time that the 300F0 is moved from the replacement area buffer 22 to the main buffer 21, and the next The defect address 35100 is set. Then, 35040 following 35030 is demodulated as usual and stored in the main buffer 21.

  Next, a case where the main buffer 21 becomes full before reaching a defect on the optical disk will be described (here, a case where the spare area buffer 22 has two free spaces is taken as an example). FIG. 7 is an explanatory diagram for explaining a case where the main buffer 21 becomes full before reaching a defect on the optical disk.

  In FIG. 7, it is assumed that the main buffer 21 is full when the data at the address 34FF0 is read. Instead of reading the next address 35000, the data in the alternative area is read as much as the space in the alternative area buffer 22. Here, it is 300F0, 30100. When reading data into the main buffer 21, the latest defective address (35010 in this example) is set in the defective address buffer 14.

  Thereafter, if the main buffer 21 becomes empty next time, the temporary storage operation is resumed, the address 3500 is read, and when the address 35010 is reached, the address 30100 is moved to the main buffer 21. The data in the replacement area buffer 22 after the movement is deleted.

  Through the above processing, data is always logically arranged in the main buffer 21. FIG. 8 is an explanatory diagram showing a state in which the address data on the optical disc according to the example of FIG. As shown in the figure, the addresses of the data temporarily stored in the main buffer 21 are 35000, 30100 (alternative address of 35010), 35020, 300F0 (alternative address of 35030), 35040.

  Therefore, the data in the main buffer 21 may be transmitted in response to a request from the host. For this reason, processing such as searching in the alternative area buffer 22 or switching the transmission source buffer is not required when data is transmitted to the host, so that the transmission operation can be speeded up.

  As described above, according to the present embodiment, the data once read to the alternative area buffer 22 is also moved to the main buffer 21, so when transmitting from the main buffer 21 to the host, the data is read from the main buffer 21. Only need to send data. For this reason, the sending to the host side can also be speeded up.

  Although the embodiment to which the present invention is applied has been described above, the present invention is not limited to such an embodiment, and various modifications are possible within the scope of the technical idea described in the claims of the present application. Needless to say.

11 decoder,
12 registers,
13 Comparator,
14 defective alternative address buffer,
15 interface,
16 DFL memory,
21 Main buffer,
22 Alternative area buffer,
23 Memory controller,
25 CPU.

Claims (5)

A first buffer for temporarily storing data read from a main area which is a main data writing area on the optical disc;
A second buffer for temporarily storing data read from an alternative area for recording in place of data to be recorded in the unusable part when there is a defect in the main area and cannot be used;
Control means for moving the data in the second buffer to the first buffer;
An optical disc apparatus comprising:   The control means reads the data of the alternative address in the alternative area corresponding to the defective address when the reading position of the data from the optical disc reaches the defective address indicating the location where the defect exists, 2. The optical disc apparatus according to claim 1, wherein other data recorded in the defective area is continuously read out and stored in the second buffer.   3. The optical disc apparatus according to claim 1, wherein the control unit further accumulates data in the second buffer when the first buffer is full up to a predetermined capacity. Temporarily storing data read from a main area which is a main data writing area on the optical disc in a first buffer;
When the first buffer is filled up to a predetermined capacity, or when the reading position of data from the main area reaches a defective address indicating that a defect exists, data is substituted for the defective address. Reading the data from the alternative area in which data is recorded and temporarily storing it in the second buffer;
Moving the data in the second buffer to the first buffer;
A method of temporarily storing data on an optical disc, comprising:   In the step of temporarily storing in the second buffer, when the data reading position from the optical disk reaches the defective address, it is recorded in the alternative area in addition to the data of the alternative address corresponding to the defective address. 5. The method of temporarily storing data on an optical disc according to claim 4, wherein other data is read and stored in the second buffer.