JPH03189965A - Optical disk medium and disk device - Google Patents

Abstract

PURPOSE:To obtain an optical disk medium which can make time required for reading out data short by storing error information which shows whole defect positions and an alternative destination position corresponding to the defect positions into the area on the medium where successive access can be executed. CONSTITUTION:A sector is constituted in a spiral state toward the outside circumferential part from the inside circumferential part of the optical disk medium D and the error information is stored in a lump into an oblique line part S near the outside circumferential part. Besides, the error information stored in the part S is constituted of a track and the sector after an error occurs, and the track and the sector after an alternative sector is processed with respect to the error. Then, the error information stored in the part S is previously read out and stored in a RAM 3 and the error information is referred when the data is read out. In such a way, the succesive access is realized and time required for access is made short. Thus, the optical disk medium which can make the time required for reading out the data short is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an optical disc medium and an optical disc device, and particularly to speeding up data reading.

BACKGROUND TECHNOLOGY Conventionally, in a WO type (Write once>) optical disk device, when reading data for which alternative sector processing has occurred during writing, the reading goes to an alternative sector provided for each track, and the corresponding data is read from an alternative sector provided for each track. If there is no data, data is read from an alternative sector for the entire optical disc medium.

However, when the above-mentioned conventional optical disk device detects an error when reading data from an optical disk medium,
Alternative sector processing was performed in which normal data was read from an alternative sector corresponding to the error area only after an error location was discovered on the optical disk medium, which resulted in a long waiting time for alternative sector processing and reduced data read time. The disadvantage was that it was long.

OBJECTS OF THE INVENTION The present invention was made to solve the above-mentioned conventional drawbacks, and its purpose is to provide an optical disk medium and an optical disk device that can shorten data read time.

DESCRIPTION OF THE INVENTION The optical disc medium according to the present invention is characterized in that error information indicating all defective positions and replacement locations corresponding to the defective positions is stored in a continuously accessible area on the medium.

An optical disk device according to the present invention includes an optical disk medium in which error information indicating all defective positions and alternative destination positions corresponding to the defective positions is stored in a continuously accessible area on the medium, and reads error information on the medium. an error information reading means; a holding means for holding the error information read by the reading means; and a holding means for holding the error information read by the reading means; It is characterized by having a data reading means for reading data.

Example Next, the present invention will be explained with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of an embodiment of an optical disc device according to the present invention. The solid line arrows in the figure indicate control signals, and the broken line arrows indicate data.

A data buffer is a storage memory for temporarily storing data when reading and writing data.

The write circuit 2 is a circuit that performs control to write data sent from the data buffer 1 and error information etc. sent from the RAM 3 to the optical disk medium.

The RAM 3 is a storage memory for temporarily storing error information sent from the error information recognition circuit.

The microprocessor 4 is a CPU of an optical disc control device, and is a device for controlling the entire optical disc device using a microprogram.

The read circuit 5 is a circuit that reads data sent from the optical disk drive 9. When alternative sector processing is being performed, the data is identified by the error information recognition circuit 8, and in response, error information is stored in the RAM 3. sent and retained. On the other hand, if alternative sector processing is not being performed, the data simply passes through the error information recognition circuit 8 and is transferred to the readout circuit 5.

The microprogram ROM 6 is a storage memory that stores instructions to be executed by the microprocessor.

The medium confirmation circuit 7 is a circuit that confirms the power state of the optical disk drive 9 and the presence or absence of an optical disk medium.

The error information recognition circuit 8 is a circuit that reads error information stored in the optical disc medium. This circuit also compares the error information read from the optical disk medium with the error information in the RAM.

The host device 11 employs a device such as a personal computer.

The optical disk drive 9 is a device that writes data to and reads data from an optical disk medium.

Note that the optical disk control device]0 indicates the entire device that controls the optical disk drive 9 and controls reading and writing of data on the optical disk medium according to commands from the host device]1.

Next, an optical disc medium used in an optical disc device having such a configuration will be explained.

FIG. 1 is a schematic diagram of an optical disk medium used in this apparatus.

In the figure, the optical disc medium is no different from the conventional one in that sectors (not shown) are arranged in a spiral shape from the inner circumference to the outer circumference. The difference from the conventional method is that error information is collectively stored in a shaded area S near the outer circumference A. In this case, it is assumed that all error information is stored in consecutive sectors for easy access. This allows continuous access and shortens the access time.

Note that the shaded area S only needs to have a storage capacity of about CM+3). The shaded area S may be located anywhere on the medium, but it must be continuously accessible.

It is also assumed that the error information stored in the shaded area S is composed of the track and sector in which the error occurred, and the track and sector after performing alternative sector processing for the error. In other words, this shaded part S
The present invention is characterized in that the error information stored in the RAM is read out in advance and stored in the RAM, and the error information in the RAM is referred to when reading data.

Further, reading and writing operations by the optical disc device of this embodiment will be explained using FIG.

FIGS. 2(a) to 2(d) are flowchart 1 showing the operation of the entire optical disc device.

First, the medium confirmation circuit 7 confirms whether or not the optical disk control device 10 and the optical disk drive 9 are powered on (step 2). If the power is off, wait until the power is turned on. When the power is on, the medium confirmation circuit 7 confirms whether or not an optical disk medium is inserted in the optical disk drive (step 2).
2).

If no optical disk medium is inserted, wait until an optical disk medium is inserted. If an optical disk medium is inserted, the microprocessor 4 performs an internal diagnosis of the optical disk control device 10 itself (step 23). At this time, the microprocessor 4 performs control based on the program in the microprogram ROM 6.

If an abnormality occurs during internal diagnosis, the operation of the optical disk controller]O is immediately terminated (steps 24-25).
). In this case, the process ends abnormally.

If the internal diagnosis ends normally, the medium checking circuit 7 checks whether error information is written on the optical disk medium (steps 24→26).

If no error information has been written, the process will continue to wait for an instruction from the third-place device (steps 26-28).
). On the other hand, if error information is written,
Error information is read out by the error information recognition circuit 8 and RA
It is transferred to M3 and stored until the power is turned off (steps 26-27). Then, it waits for an instruction from the host device 11 (steps 27→28).

Next, the case of read operation will be explained. The microprocessor 4 recognizes the read command based on the command from the host device 11, and causes the read circuit 5 to read from the optical disk medium (step 28-40). In this case, when the data passes through the error information recognition circuit 8, the error information in the RAMB is referred to. Here, the determination is made based on the match between the error information in the RAM 3 and the address of the data (step 41). That is, if the address of the data to be read from now matches the error information, it can be determined that the data at that address is an error, and an alternative sector corresponding to that address exists.

Therefore, as soon as it is recognized that an alternative sector exists θ, alternative sector processing based on the error state is executed (steps 42→43→44). In other words, top RA, M 3
Since there is error information within, normal data can only be read from the alternative sector for a short time.

On the other hand, in the reading method in conventional devices, error information on the medium is read each time and data is read from an alternative sector, which takes a long time.

On the other hand, if there is a mismatch, it means that there is no error in the track or sector position corresponding to that address.
Data is read from that address as is, and no alternative sector processing is performed (steps 42→44).

The data after performing the alternative sector processing or the error-free data is converted into a normal pig by the reading circuit 5 (step 44) and is passed through the data buffer to the third-order device 1.
1 (step 45). After that, if there is further reading, the reading operation is performed again (step 46).
→28).

Furthermore, the case of a write operation will be explained. -1- position device 1
Based on the command from 1, the microprocessor recognizes the write command from 4 and causes the write circuit 2 to write to the optical disk 0 medium (steps 29 to 35).

In this case, data sent from the host device 11 is stored in the temporary data buffer 1, and the data is transferred to the write circuit 2.
(step 35).

Then, data is written to the optical disk medium in the optical disk drive 9 under the control of the write circuit 2 (step 36). At this time, if an error occurs, alternative sector processing will be performed.

When alternative sector processing is performed, the optical disk drive 9
From there, the track and sector in which the error occurred and the track and sector after the replacement sector processing are sent out. Then, error information is formed by the error information recognition circuit 8,
The error information is transferred to RAM3 and stored in this RAMB (steps 37→38).

Note that if no error occurs, alternative sector processing is not performed (steps 37-39).

Furthermore, it is checked whether there is any writing, and if there is, the writing operation is performed again (steps 39-35), and if there is no writing, it waits for an instruction from the host device 1 (steps 39->28 in step 1).

When the operation by the write and read command is completed and all operations are to be completed normally, perform the following operation (step 30 → 3).
]).

First, under the control of the microprocessor 4, error information in the RAMB is compared with error information on the optical disk medium (step 31). In this case, error information on the optical disc medium is transferred to the error information recognition circuit 8. If there is a difference between the error information and the error information in RAMB (if the error information in RAMB has increased), the increased error information in RAMB is transferred to the write circuit 2. Then, the error information is written on the optical disk medium in the optical disk drive 9 in the area where error information is written, that is, the previously mentioned hatched area S (steps 32-33). After performing the above operations, the process ends normally (steps 33-34).

Note that if the error information on the RAMB side is the same as the error information on the optical disk medium, writing will not be performed and the i
'l' becomes the regular ending (step '32 → '32 4).

In other words, the present invention uses an optical disk medium in which all error information on the medium is written in a continuously accessible area so that it can be easily read out, and when the medium is inserted, the error information is read and retained, and during the read operation, Since the data is read while referring to the error information, the read time can be shortened. Furthermore, since information regarding alternative sector processing performed during a write operation is written to the optical disk medium when all operations are completed, the latest error information is always stored on the medium.

It is also conceivable to insert a medium in which error information is stored in an area that cannot be continuously accessed, such as a medium in which error information is stored in a scattered manner, into the apparatus of this embodiment. However, in this method, it takes a long time to read out the error information and hold it in the RAM, and it takes a long time until the error information can be read out, so it is not a good idea.

Effects of the Invention As described in Section 2, the present invention has the advantage that, since error information is stored in the RAM in advance, alternative sector processing can be performed at high speed and data read time can be shortened.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an optical disc medium according to an embodiment of the present invention, Figures 2 (a) to (d) are flowcharts 1 and 3 showing the operating procedure of an optical disc control device, and Figure 3 is an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of an optical disc device according to FIG. Explanation of symbols of main parts D...Optical disk medium 2...Writing circuit 3...RAM 5...Reading circuit 7...Medium confirmation circuit 8...・Error information recognition circuit

Claims (2)

[Claims] (1) An optical disc medium characterized in that error information indicating all defective positions and replacement positions corresponding to the defective positions is stored in a continuously accessible area on the medium. (2) An optical disk medium in which error information indicating all defective positions and replacement positions corresponding to those defective positions is stored in a continuously accessible area on the medium, and an error information reading means for reading out error information on the medium. and a holding means for holding error information read by the reading means, and reading the data while referring to the error information in the holding means when reading data on the optical disk medium in response to an external command. An optical disc device comprising: data reading means.