JPS63863A - Optical disk recording method - Google Patents

Abstract

PURPOSE:To perform write at high speed, by recording the bit of identification information of a defective block generated at time of manufacturing in advance on an optical disk medium, detecting it at the first time of writing, and writing it on an alternate block in the same rotation. CONSTITUTION:A defective block flag part which represents the defective block generated at time of manufacturing is provided in advance. A received data is stored in a buffer memory 4 through an interface controller 1, and is supplied to an optical head part 10 by a write circuit 5. Simultaneously, a read circuit 6 monitors the flag part of each block, and when it detects the flag, it is informed to a microprocessor 2. And the data of the block corresponding to the defective block is supplied from the memory 4 to the circuit 5, and it is written on the block in an alternate area on the disk. In such a way, the number of rotation required for the write can be reduced, and the speed of the write can be set at high speed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an optical disc recording method for recording required information by dividing the inside of a trunk into a plurality of blocks. [Prior Art] Fig. 4 shows an example of the recording format within one track in the conventional optical disc recording method of this type disclosed in, for example, Japanese Unexamined Patent Publication No. 59-165207. It shows. In this figure, each track consists of m blocks Bo-Bm- corresponding to sectors, and each block consists of an ID section and a data section. The ID section mainly records information indicating the physical location of the block (trunk number and block number), and the data section records 1, for example, 512 bytes of data and signal information such as error recovery symbols. In the example shown in Figure 4, block no. to B+n-4 is the original recording area for recording normal user data, and hereinafter the blocks in this area will be collectively referred to as normal block NB. do. Block Bm-4
The following three blocks Brn-3 to Bm-1 are replacement areas that are used as replacement blocks when a write failure occurs in any normal block NB of the track in question. The block will be called a replacement block AB.

FIG. 5 is a configuration diagram of an optical disc control device that controls the writing and reproduction of information to the above-mentioned normal block NB and spare block AB. In this FIG. 2 is a microprocessor that operates each component of the optical disk control device according to a predetermined procedure in accordance with commands from a host device; 3 is a microprocessor that specifies control operations by the microprocessor 2; A program memory 4 for storing instructions; a buffer memory 4 having a data storage capacity of at least one track of an optical disk; 6 is a write circuit that outputs to the optical head circuit 10, and 6 is the optical head circuit 1.
A reading circuit is shown which demodulates the output signal S10 from 0, further calculates the syndrome, applies ECC correction to the data if necessary, and transfers it to the buffer memory 4.

Furthermore, the reading circuit 6 is equipped with a buffer for storing one block of data as explained in FIG. A signal line 24 informs the microprocessor 2 of the result. In addition, 7
is a selector for selecting the input/output bus of the buffer memory 4, and this selector 7 is connected to the bidirectional signal line 2.3 f! from the microprocessor 2. : interface bus 20. Processor bus 21 and R/W (read/write) circuit bus 2
2 is selectively connected to the buffer memory 4.

Next, the write operation of the optical disc control device shown in FIG. 5 will be explained in order.

(1) First, the data received from the host device is buffered in the buffer memory 4 via the interface controller 1 for one trunk (step al).

(2) The data for one trunk stored in the buffer memory 4 is supplied one block at a time via the write circuit 5 to the optical head circuit 10, and is sequentially written into the normal blocks NB of a predetermined trunk on the optical disk (step a2).

(3) Sequentially read the data of the normal block NB written in step a2 and apply ECC correction. At this time, when a block that cannot be corrected by ECC is detected, an FCC error is notified to the microprocessor 2 via the signal line 24 (step a3).

(4) When the microprocessor 2 detects blocks with write errors, it supplies the data corresponding to these blocks from the buffer memory 4 to the write circuit 5, and sequentially writes them into blocks AB in the spare area on the optical disk (step a4).

(5) Sequentially read the data of replacement block AB written in step a4 and add ECC correction (step a5)
.

(6) If an error block is detected in step a5, the microprocessor 2 executes step a4. a5
is repeated, and a replacement block AB to replace these is rewritten in the empty area of the replacement area (step a6).

Through the above procedure, one track's worth of normal data is written into the normal block NB or the alternate block AB.

When reading these trunks, (1) data is read from the trunk on the optical disk through the optical head circuit 10 while applying ECC correction in the reading circuit 6, and data for one trunk is stored in the buffer memory 4 (step bl).

(2) For blocks whose ECC cannot be corrected in step b1, a corresponding replacement block AB is searched for in the buffer memory 4, replaced with a defective block, and transferred to the host device (step b2).

Next, the writing of one track's worth of data when there is one unwritable block in the above writing operation will be described with reference to FIG. 6 as time passes.

In FIGS. 6(a) to (d), blocks Bo to Bm-4 are normal blocks NB, Bm-3 to Bm-1 are replacement blocks AB, Bn is a non-writable block, and Wu (Q=
0.1. -・m-4) L Doi Q block writing, R
Q (Q = 0, 1, ..." m-4) is the data read and FCC correction of the nth block, W'n
is the writing of the same data as the n-th block to the replacement block AB, and R'n is the reading of the replacement block AB and the FC
This indicates that it is a C modification.

First, the optical head seeks onto a predetermined track, and in the first rotation sequentially writes data from O to m-4th blocks [see WO to Wm-4 in FIG. 6(b)]. In the second rotation, the 0th to m-4th blocks written in the first rotation are sequentially read out, and FCC correction is applied in block units.
Refer to Ro"Rm-4 in FIG. 6(c). At this time, since the FCC error is detected when the reading of the n-th block is completed, the last replacement block Bm-1 is detected in the same second rotation. Write the same data as the nth block [see W'n in Figure 6 CC). At the third rotation, the second
The data of the replacement block Bn-1 written in the rotation is read and the ECC is corrected [R'n in FIG. 6(d)
Reference.

[Problems to be Solved by the Invention] However, in order to take the above-described procedure, such a conventional optical disc recording method creates one unwritable block when writing data for 11 ranks. exists, the disk will have at least 3
The problem is that it needs to rotate, which reduces the writing speed.

be.

This invention was made in order to solve the above-mentioned problems, and if there is a non-writable block at the time of production, by recording this fact on the optical disk medium in advance, one trunk can be saved. An object of the present invention is to obtain an optical disc recording method which can complete data writing in at least two revolutions and shorten the writing time.

[Means for Solving the Problems] The optical disc recording method according to the present invention includes information on a defective block at the time of production, which is caused by a master disc or a stamper, among non-writable blocks. This is what was recorded.

[Function] In the optical disc recording method according to the present invention, identification information about defective blocks generated during manufacturing is recorded in advance on the optical disc medium. Therefore, this defective block is detected when data is written for the first time. Therefore, data can be written to a replacement block during the same rotation without the need for subsequent reading and FCC correction.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. 1st
The figure is a schematic diagram showing the fRRf process of an optical disk medium and the writing process of defective block information at the same time. In the figure, DOR is an optical disk master, and this optical disk master DOR is a glass master that contains header information such as guide grooves and addresses. is cut with a laser beam. ST
The photoresist pattern of the original DOR was transferred using an Nl stamper. rl, r2. ..., rn are a plurality of replicas created by the stamper ST, and these replicas serve as recording media on the optical disc. Each replica rl, r2. ..., rn.

After coating nitrocellulose and ultraviolet light curing resin on the stamper ST and attaching a glass base, the resin is cured by irradiation with ultraviolet light, and after the stamper ST is peeled off, a recording film is deposited. be done.

Next, for example, two replicas rl and r2 are arbitrarily selected from among the 0 replicas created in this process, a specific pattern is recorded on the entire surface, and then the data on the entire surface is read and the presence or absence of defective blocks is determined. Detect. and these 2
The address of a block that is a common defective block among the replicas r·1°r2 is detected. The common defective block detected here is caused by a defect that occurs during the creation of the master DOR and stamper ST, so a block with the same address as this common defective block is also written to the remaining replicas r3 to rn. The probability of an impossible block is very high.

Therefore, the recording format within one track is configured as shown in Fig. 2, and as shown in Fig. 2, in addition to the ID section and data section, a bad block flag indicating that the block is unwritable is added to the block. A section f is provided. In addition,
In FIG. 2, the same symbols and name parts as in FIG. 4 have the same functions as in the conventional example.

Then, for all the replicas r3 to rn of the previous Rfl, a flag indicating that the block is a defective block is recorded in the defective block flag section f of the block having the same address as the common defective block.

Further, the optical disk control device that controls writing and reading of data to each block shown in FIG. 2 is the same as the conventional example shown in FIG.

Next, the operation of an optical disc control device (same configuration as shown in FIG. 5) for carrying out an optical disc recording method as an embodiment of the present invention will be described.

First, the write operation will be explained.

(1) One track worth of data received from the host device is stored in the buffer memory 4 via the interface controller 1 (step Al).

(2) The data for one trunk stored in the buffer memory 4 is supplied one block at a time via the write circuit 5 to the optical head circuit 1o, and is sequentially written into the data portion of the normal block NB of a predetermined track on the optical disk. However,
At this time, the reading circuit 6 simultaneously monitors the defective block flag part f of each block, and if a defective block is detected, it notifies the microprocessor 2 via the signal line 24 (step A2).

(3) When all normal blocks NB have been recorded in step A2, if a defective block is detected by the defective block flag, the data of the corresponding block is supplied from the buffer memory 4 to the write circuit 5, and the data is continued to the disk. Write to block AB in the upper spare area (step A3).

(4) Sequentially read the data of the normal block NB written in step A2 and the spare block AB written in step A3 and apply ECC correction. At this time, when a block in which a defective block flag is not written and which cannot be ECC corrected is detected, an FCC error is notified to the microprocessor 2 via the signal line 24 (step A4).

(5) If a write error block is detected in step A4, steps a4 and a5 of the conventional write operation are repeated, and a replacement block AB is rewritten in the empty area of the replacement area (step A5).

Note that the read operation is exactly the same as in the conventional example.

Next, in the write operation as in the conventional example.

Writing data for one track when there is one defective block will be explained with reference to FIGS. 3(a) to 3(c).

In Fig. 3 (a) to (c), Bo to Bm-4 are normal blocks NB, Bm-3 to Bm-1 are replacement blocks AB, and Bn is a bad block whose bad block flag is significant, WQ CQ. =0.1...

m-4) is the writing of the nth block, Rfl (Q=
0°1..., m-4) is data reading and ECC correction of the n-th block, and W'n is writing of the same data as the data of the n-th block to a replacement block.

R'n indicates reading of replacement block and ECC modification.

First, the optical head is sought onto the target track and the first
Data is sequentially written from O to n-th block in the rotation. When writing the nth block, the bad block flag is detected, and the microprocessor 2 knows that the nth block is a bad block. Then, the data of the n+1 to m-4th blocks are sequentially written, and then the same data as the nth block is written to the m-3th replacement block.

In the second rotation, the data of the 0th to m-4th regular blocks and the m-3rd replacement block written in the first rotation are read and ECC corrected.

Here, even if it is detected that the ECC cannot be corrected in the n'Wi-th block, it is ignored.

In the above embodiment, bad block information was detected by the presence or absence of a flag for each block, but the address of the bad block is written in a specific area on the disk, and when the disk medium is inserted into the optical disk controller, the bad block address is detected on the optical disk. Even if the control device stores the information on the read memory, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, since defective blocks are detected at the time of data writing, the number of disk revolutions required to write one track of data is reduced.
This has the effect of contributing to faster writing speed.

[Brief explanation of the drawing]

1 to 3 show an optical disc recording method as an embodiment of the present invention. In order to explain this method, FIG. Figure 2 is a recording format diagram of one track showing the location where the bad block information is written, and Figures 3 (a) to (c) are the case where there is one unwritable block in one trunk. FIGS. 71 to 6 show a conventional optical disc recording method, FIG. 4 is a one-track recording format diagram in the conventional optical disc recording method, and FIG. Block diagram of the control device,
FIGS. 6(a) to 6(d) are diagrams for explaining a write sequence when one track has one unwritable block by conventional means. In the figure, DOR-master, f...bad block flag section, ST-stamper, rL~rn...-replica as a recording medium. In addition, in the figures, the same reference numerals indicate the same parts or the priest parts.

Claims (3)

[Claims] (1) In an optical disc recording method in which required information is recorded by dividing a track into multiple blocks, identification information for defective blocks that occur during manufacturing may be recorded in advance on the optical disc medium created by a stamper. Characteristic optical disc recording method. (2) The optical disc recording method according to claim 1, wherein identification information about the defective block is recorded as a flag in a specific area within each block. (3) The optical disc recording method according to claim 1, characterized in that identification information about the defective block is recorded in a specific area on the optical disc medium as a defective block address.