JPH0668603A - Optical disk device - Google Patents

Abstract

PURPOSE:To accelerate a data write speed in an optical disk device by improving a system for exchanging and processing a defective sector. CONSTITUTION:An optical disk 10 provided with a data storing sector, an alternate sector for the defective sector and a defect control sector registering the defective sector list is loaded attachably/dettachably. A data signal transferred from a host computer 30 is written in the data storing sector at every sector. When the sector required to be written a data signal is the defective sector, relevant data signal is stored in the alternate sector area 232 in a buffer memory 23 provided in the optical disk device 20, and after operation is ended, before the medium is taken out, the data signal stored in the alternate sector 232 is written in the alternate sector 12 in the optical disk medium 10 together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly, to an alternative sector management system when a defective sector occurs on an optical disk medium.

[0002]

2. Description of the Related Art Generally, a rewritable or write-once type optical disk medium has a micron-order or submicron-order on a surface of a substrate on which a micron-order or submicron-order fine preformat pattern is formed. It is extremely difficult to form the entire recording area without any defect because the thin films of (1) are laminated in one layer or multiple layers, and it is rather common to include some defects. For this reason, conventionally, the optical disk device has been provided with a replacement treatment function for enabling the use of an optical disk medium having a region (defective sector) where data recording cannot be normally performed.

An example of a conventional replacement treatment method will be described with reference to FIGS. 3 and 4. FIG. 3 is an explanatory view showing an example of sector division of an optical disk medium, and FIG. 4 is a flow chart showing program software for executing a replacement process. Figure 3
As shown in FIG. 3, the optical disk medium 10 is provided with a data storage sector 13, a defective sector replacement sector 12, and a defect management sector 11 for registering a defective sector list. A list of defective sectors in the optical disk medium 10 checked before the start of use is registered. When the optical disc medium 10 is loaded into the optical disc device, the defective sector list registered in the defect management sector 11 is read into the optical disc device,
The unit enters the recording / playback operation wait state. In this state, when the user inputs a data recording start command, the procedure of FIG. 4 is started.

First, in step S-1, the optical head seeks to the head sector of the unrecorded sectors among the data storage sectors 13. Next, in step S-2, the data signal transmitted from the host computer is taken into the optical disk device and written in the work area of the buffer memory.
In step S-3, the address of the data storage sector 13 to which the optical head is sought and the defect management sector 11
The defective sector list registered in step S-4 is compared, and in step S-4, it is determined whether or not the sector to which the optical head has sought is a defective sector. If it is determined in step S-4 that the sector where the optical head has sought is a defective sector, the process proceeds to step S-5. Then, in step S-5, the optical head seeks from the data storage sector 13 to the alternative sector 12, and in step S-6, the data signal in the working area is transferred to the head sector of the unrecorded sectors of the alternative sector 12. Written. When it is determined in step S-4 that the sector to which the optical head has sought is not a defective sector, the process proceeds to step S-7, and the data signal in the working area is written in the target sector. After writing the data, in step S-8, it is determined whether or not the data recording is completed for all the data signals transmitted from the host computer, and if it is determined that the data recording is not completed, step S-8
-2, the above procedure is repeated, and when it is determined that the data recording has been completed for all the data signals, the purpose is achieved and the operation is completed.

[0005]

Data storage sector 1
Since the data storage sector 3 and the alternative sector 12 exist at positions physically separated from each other on the optical disk medium 10, the data storage sector 1
3 for relocating the optical head positioned at 3 to the alternative sector 12 and relocating the optical head located at the alternative sector 12 to the data storage sector 13 Need time. Therefore, if the above-mentioned replacement processing method is adopted, the optical head has to reciprocate between the data storage sector 13 and the alternative sector 12 for each defective sector, so that a seek operation proportional to the number of defective sectors and The time for waiting for rotation is required, and the data writing speed is significantly reduced when the number of defective sectors is large. Therefore, in order to speed up the writing of the data signal to the optical disk medium, it is necessary to develop a replacement processing method capable of performing the data replacement processing at high speed even when the number of defective sectors is large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical disk device having a high data writing speed.

[0007]

In order to achieve the above-mentioned object, the present invention attaches and detaches an optical disk medium having a data storage sector, a replacement sector for a defective sector, and a defect management sector for registering a defective sector list. If possible, the data signal transferred from the host computer is written to the data storage sector on a sector-by-sector basis, and if the sector to which the data signal is to be written is a defective sector, the data signal to be written to the defective sector is replaced by the alternative. In an optical disk device that writes data to a sector, if a buffer memory is provided in the optical disk device and the sector to which the data signal is to be written is a defective sector, the data signal is stored in the buffer memory, after the operation is completed, and before the medium is ejected. , The data signal stored in the buffer memory is transferred to the alternative sector. It was configured to write Te order. The buffer memory can be shared with a buffer memory that temporarily stores the data signal transferred from the host computer.

[0008]

When the data signal to be written in the alternative sector is stored in the buffer memory, the seek operation of the optical head becomes unnecessary. On the other hand, the writing of the data signal to the buffer memory can be performed at an extremely high speed as compared with the writing of the data signal to the optical disc medium. Therefore, if the above-mentioned alternation processing method is adopted, during the write operation of the data signal,
Regardless of the number of defective sectors, it is possible to realize a writing speed almost equal to that of writing a data signal on a defect-free optical disk medium. After the operation is completed and before the medium is taken out, the data signal stored in the buffer memory is written in the alternative sector of the optical disc medium, so that the total processing time is longer than that in the case of a defect-free optical disc medium. Since the stored data signals are collectively written to the alternative sector, even if there are a plurality of defective sectors, the replacement process can be completed by one seek operation, and as compared with the conventional method of seeking the optical head for each defective sector. , The writing speed can be remarkably increased.

[0009]

1 is an explanatory view showing an example of an optical disk device according to the present invention, and FIG. 2 is a flow chart showing program software for executing the replacement processing system of the present invention.

As shown in FIG. 1, in the optical disk device 20 of the present embodiment, an optical head 21 for recording / reproducing a data signal to / from the optical disk medium 10 and a seek operation control circuit for controlling the seek of the optical head 21 are provided. 26 and the optical head 2
1, a read / write control circuit 22 that controls the intensity of the light beam emitted from the optical disc 1, a buffer memory 23, an interface circuit 24 that connects the host computer 30 and the optical disk device 20, and a central processing unit that controls these circuits. 27 and a medium ejection detection circuit 28 which detects that the medium ejection button 40 has been operated and transmits a medium ejection signal to the central processing unit 27.

The buffer memory 23 should be recorded in a defective sector list area 231 for registering a list of defective sectors and an alternative sector 12 (see FIG. 3) provided on the optical disc medium 10 as shown in FIG. An alternative sector area 232 for registering a data signal and the host computer 3
It is divided into a work area 233 for temporarily storing the data signal transmitted from 0 through the interface circuit 24 and sequentially sending it to the read / write control circuit 22 based on a command from the central processing unit 27. Alternative sector area 2
32 has the same capacity as the capacity of the alternative sector 12, and the address corresponding to each alternative sector is determined.

As the optical disk medium 10, the conventional product having the configuration of FIG. 3 is applied as it is. That is, the recording area is divided into a defect management sector, a substitute sector 12, and a data storage sector 13 so that the recording area can be attached to and detached from the optical disc device 20. In addition, in FIG.
a defect management sectors, b replacement sectors 12, and c
Those having one data storage sector 13 are displayed.

In the following, when the sector k2 in the data storage sector 13 is a defective sector and the alternative sector is the sector d, a case where a data signal is written in the sectors k1 to k3 in the data storage sector 13 will be described. By way of example, the replacement processing method according to the present invention will be described. Before the replacement process is started, when the optical disk medium 10 is mounted in the optical disk device 20, the defective sector list registered in the defect management sector 11, that is, the sector k2 is a defective sector, and its replacement sector is the sector d. It is read into the optical disk device 20 and the buffer memory 2
3 is stored in the defective sector list area 231 and the optical disk device 20 is in a recording / reproducing operation waiting state. From this state, when the user inputs a data recording start command, the procedure of FIG. 2 is started.

First, in step S-11, based on the control signal from the seek operation control circuit 26, the optical head 21
Seek to the target sector k1. Next, step S-
12, via interface circuit 24, sector k
The data signal to be recorded in 1 is fetched from the host computer 30 into the optical disc device 20 and stored in the work area 233 of the buffer memory 23. Step S-13
Then, the defective sector list area 231 of the buffer memory 23
Then, the defective sector list is read out into the central processing unit 27, and it is judged in step S-14 whether or not the sector k1 is a defective sector. The above procedure is the same as the conventional replacement processing method.

Since the sector k1 is not a defective sector, in this case, the process goes to step S-15, the recording light is emitted from the optical head 21 based on the control signal from the read / write control circuit 22, and the sector k1 is output. The data signal stored in the work area 233 is written in. Next, in step S-16, it is determined whether or not data recording has been completed for all data signals. In the case of this example, since the data recording on the sectors k2 and k3 is not completed, the process returns to step S-12. Then, in the same manner as described above, the sector k is transmitted through the interface circuit 24.
The data signal to be recorded in 2 is fetched from the host computer 30 into the optical disk device 20 and stored in the work area 233 of the buffer memory 23. Then, in step S-13, the defective sector list is read from the defective sector list area 231 of the buffer memory 23 into the central processing unit 27, and in step S-14, it is determined whether the sector k2 is a defective sector. Is judged.

Since the sector k2 is a defective sector, in this case, the process goes to step S-17, and the data signal stored in the work area 233 corresponds to the sector k2 of the alternative sector area 232 in the same buffer memory 23. Forwarded to the address. Then, the process goes to step S-16 again, and it is judged whether or not the data recording is completed for all the data signals. In the case of this example, since the data recording on the sector k3 has not been completed, the process returns to step S-12. Then, similarly to the data recording on the sector k1, a predetermined data signal is written to the sector k3, and the data recording on the data storage sector 13 is completed.

The above operation is performed based on a command from the central processing unit 27.

After the data recording in the data storage sector 13 is completed, the data signal stored in the alternative sector area 232 is written in the alternative sector 12 and the alternative sector 1
The loss of the data signal to be written in 2 is prevented. An example of the data recording method for the alternative sector 12 will be described below. When the medium ejection button 40 is operated, the medium ejection detection circuit 28 transmits a medium ejection signal to the central processing unit 27. Receiving this signal, the central processing unit 27 drives the seek operation control circuit 26 to seek the optical head 21 to the sector d in the alternative sector 12 and drives the read / write control circuit 22 to drive the buffer memory 23. The data signal stored in the alternative sector area 232 of 1 is written in the sector d. After that, the optical disc medium 10 is ejected from the optical disc device 20, and the system is terminated.

When the sector in which the data signal is to be written is a defective sector, the optical disk device 20 of the above embodiment stores the data signal in the buffer memory 23 provided in the optical disk device 20, and after the operation is completed, the medium is stored. Since the data signals stored in the buffer memory 23 are collectively written to the alternative sector 12 of the optical disc medium 10 before taking out, it is not necessary to seek the optical head to the alternative sector 12 for each defective sector. As compared with the case where the data signal is rewritten in the alternative sector 12 every time, the writing speed of the data signal can be remarkably increased.
In particular, after the operation is completed and before the medium is taken out, the data signals stored in the buffer memory 23 are collectively written in the alternative sector 12 of the optical disk medium 10. Therefore, even if there are a plurality of defective sectors, the replacement is performed by one seek operation. The processing can be completed, which is advantageous for increasing the writing speed. Also,
The optical disk device 20 of the above-described embodiment has the medium eject button 4
Since the data recording is performed on the alternative sector 12 according to the operation of 0, the handling of the optical disk device 20 is not complicated and the usability is good. Further, in the optical disk device 20 of the above-described embodiment, the buffer memory 23 for storing the alternative data is shared with the buffer memory for taking in the data signal from the host computer 30, so that the structure is simple and can be implemented at low cost. There are advantages.

The defective sector of the optical disk medium may be generated afterwards due to deterioration of the recording film or the like. In order to cope with such a defective sector, after writing a data signal to a target data storage sector, the recording data of the sector is read to check whether or not a desired data signal is recorded, and a correct data signal is recorded. If not, register the address of the relevant sector in the defect management sector,
The data can also be registered in the alternative sector area of the buffer memory.

[0021]

As described above, according to the present invention, it is not necessary to seek the optical head to the alternative sector for each defective sector, and the data signal can be continuously written in the data storage sector. Therefore, the writing speed of the data signal can be remarkably increased as compared with the case of rewriting the data signal in the replacement sector for each defective sector. In particular, even when there are a plurality of defective sectors, the replacement process can be completed by one seek operation, which is highly effective.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an optical disc device according to the present invention.

FIG. 2 is a flowchart showing program software for executing the replacement processing method of the present invention.

FIG. 3 is an explanatory diagram showing an example of sector division of an optical disc medium.

FIG. 4 is a flowchart showing a procedure of a replacement process according to a conventional example.

[Explanation of symbols]

 10 optical disk medium 20 optical disk device 21 optical head 23 buffer memory 231 defective sector list area 232 alternative sector area 233 working area 30 host computer

Claims (2)

[Claims] 1. An optical disk medium having a data storage sector, a replacement sector for a defective sector, and a defect management sector for registering a defective sector list is detachably mounted, and a data signal transferred from a host computer is used as the data. In the optical disk device for writing the data signal to be written in the defective sector to the alternative sector, when the sector for writing the data signal to the storage sector and writing the data signal is a defective sector, a buffer memory is provided in the optical disk device. If the sector to which the data signal is written is a defective sector, the data signal is stored in the buffer memory, and after the operation is completed, the data signal stored in the buffer memory is collected in the alternative sector before the medium is taken out. An optical disk device that is written by writing. 2. The optical disk device according to claim 1, wherein the buffer memory is also used as a buffer memory for temporarily storing a data signal transferred from the host computer.