JPS60233745A - Optical disk control system - Google Patents

Abstract

PURPOSE:To shorten the data access time of an optical disk and to reduce the load of a CPU by comparing the optical disk set in a ready state with the volume name of an external memory to store them in an internal memory and reporting the ready state to the CPU. CONSTITUTION:When both an optical disk 14 and an external memory 15 are set in a ready state respectively, an optical disk control part 18 and an external memory part 19 read the volume names stored in fixed addresses of the disk 14 and the memory 15 to an internal memory 17 by ready signals (b) and (c). Then each end flag is set up after the normal read is through. An optical disk controller 13 compares the volume names of the disk 14 and an external memory medium with each other on the memory 17. When coincidence is obtained from said comparison, those volume names are stored at the prescribed positions of the memory 17. Then a coincidence flag is set up. The controller 13 informs a CPU11 by an interruption signal (a) that the disk 14 is put under a ready state. These read end flag and the volume name coincidence flag are held as log as both the disk 14 and memory 15 are kept in a ready state respectively.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a DRA in which data can be written only once.
W (Direct Read After Write
) type of optical disk, and particularly relates to a control method for controlling an optical disk by storing an optical disk directory in an external storage device such as a floppy disk or a magnetic disk in order to facilitate random access to the optical disk.

[Conventional technology]

In the control method described above, since the directory section of the optical disk is stored on the external storage medium, it is necessary to check whether the volume name of the optical disk and the volume name of the external storage medium match before accessing the data. Since there is a risk of accessing incorrect data, it is necessary to use a control method to confirm that the polymer names match each time data is accessed.

A conventional control method for this will be explained using FIGS. 3 and 4. FIG. 3 is a block diagram showing an example of a conventional control method, and FIG. 4 is an operation flowchart of the conventional control method.

In FIG. 3, 1 is a central processing unit (hereinafter abbreviated as CPU), 2 is a main storage device, 3 is an optical disk control device, 4 is an optical disk, and 5 is an external storage device.

In order for the CPU 1 to access the optical disk 4, the CPU 1 confirms that the optical disk 4 and the external storage device 5 are in a ready state using a ready signal (c), and then the CPU 1 sends a message to the optical disk controller 3. It issues a command to read data from the optical disc 4 and stores it at a fixed address on the optical disc 4. y Read the IJ neem name into the main memory 2.

Similarly, the CPU 1 reads the g IJ neem name stored in the external storage device 5 into the main storage device 2 .

After completing the above operations, the CPU 1 compares and confirms on the main storage device 2 that the volume names of the external storage medium in which the directory is stored and the optical disk medium in which the data is stored match, and then the CPU 1 A command was issued to the control device 3 to access data on the optical disk. The flow of the above operation is shown in FIG. In this way, in the conventional method, each time you access data on an optical disk, you have to check the optical disk's GJ name and the external storage medium's name.
It has the disadvantage that it takes time to access data and wastes CPU resources.

[Problem of invention]

The present invention has been made in order to eliminate the drawbacks of the prior art as described above, and when an optical disk and an external storage device become ready, the optical disk control device automatically reads the volume names of both media. Check the Zelium name and check whether it is both? Only when the volume names match, it is reported to the CPU that the optical disk is ready, and the volume name is held in the optical disk control unit until the optical disk or external storage device becomes not ready due to medium exchange, etc. However, when either one becomes not ready, the volume name is deleted from the optical disk control unit, and the CP
An object of the present invention is to provide an optical disk control device that reports a not-ready state to a computer.

[Structure and operation of the invention]

The optical disk control device that realizes the control method of the present invention, like existing optical disk control devices, has the function of positioning the optical head on a predetermined data track of the optical disk, and writing storage data to and from the selected data track. In addition to the read control function, there is also a data writing and read control function to the external storage device, an internal memory that reads the volume name of the optical disk and external storage medium, and stores the g IJ name if the two match. , 472717, which controls data transfer with host CF'U.
It consists of one circuit.

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing the configuration of this embodiment, and FIG. 2 is an operation flowchart of this embodiment. In FIG. 1, 11 is a CPU 112 which is a main storage device, 13 is an optical disk controller, 14 is an optical disk, 15 is an external storage device, and an optical disk controller 13 is a CPU interface 16, an internal memory 17, and an optical disk controller 18. and an external storage device control section 19.

As shown in FIG. 1, when the optical disk 14 becomes ready, the ready signal causes the optical disk controller 18 in the optical disk controller 13 to internally read the volume name stored at the fixed address of the optical disk 14. The data is read into a predetermined address in the memory 17, and after the reading is completed successfully, a flag indicating completion of reading the name of the optical disc is set.

Similarly, when the external storage device 15 becomes ready, the ready signal C causes the external storage control unit 19 to store data at a fixed address in the external storage medium. g. Read the IJ neem name into a predetermined address in the internal memory 17, and after the reading is successfully completed, set a volume name reading completion flag on the external storage medium. When the optical disk control device 13 confirms that the volume name reading completion flag of the optical disk and external storage medium is set, it compares the volume names of both on the internal memory 17, and if the volume names of both match, Store the volume name in a predetermined location in the internal memory 17, and ? Set the volume name match flag. The stored volume name is used for verification when the CPU 11 issues a command to confirm the volume of the optical disk. At the same time as the above operation is completed, the optical disk control device 1
3 notifies the CPU 11 that the optical disk has become ready by means of an interrupt signal a.

Note that even if the volume names do not match during the above operation, the optical disk control device 13 reports an error status to the CPU 11 indicating that the volumes do not match.

The above-mentioned reso 4 state, that is, the optical disc and external storage medium - the name read completion flag? The volume name match flag is held as long as the optical disk 14 and external storage device 15 are physically ready.

Next, when the optical disk 14 becomes not ready due to medium exchange of the optical disk, etc., the optical disk control unit 18 clears the volume name reading completion flag of the optical disk.

Similarly, when the external storage device 15 enters the not-ready state, the external storage control unit 19 clears the volume name reading completion flag of the external storage medium. On the other hand, the optical disk control device 13 constantly monitors the volume name read completion flag of the optical disk and external storage medium, and when either flag is cleared, it clears the volume name match flag and sends an interrupt signal a to the CPU 11. Reports not-ready status via.

As explained above, in this embodiment, the volume check mechanism for the optical disk and external storage device is built into the optical disk control device, so the process in which the CPU controls the optical disk follows the flow shown in FIG. , compared to the flow shown in FIG. 4, the data access time of the optical disc can be shortened and the load on the CPU can be reduced.

On the other hand, when using the present optical disk control device 13 to control only the optical disk 14 without storing the disk address of the optical disk in an external storage medium, the ready state is reported to the CPU 1 using the method described above. In this method, even if the optical disc 14 is in a ready state, the optical disc 4 cannot be accessed unless the external storage device 15 is in a ready state. In order to overcome these drawbacks,
According to the present invention, a mode setting command is newly provided, and C
When a command to set the first mode is received from the PU 11, both the optical disk 14 and the external storage device 15 become ready, and when the television names of both match, the C
When the function of reporting the ready status to the PU 11 is enabled and a command to set the first mode is received from the CPU 11, the optical disk 14 simply becomes physically ready, and the ready status is reported to the CPU 11. It is also possible to have both functions.

In addition, although the case where the reading completion flag and the match flag were used was explained in the above description, it is not necessary to use these flags if the following method is performed.

First, when the optical disk control device is powered on, an unused volume name is stored in the volume name storage area of the internal memory of the optical disk control device, and even if a match is detected in the volume name, the g17 unit is stored. When the name is an unused volume name, the ready state may not be reported to the CPU as described above.

〔Effect of the invention〕

As explained above, according to the method of the present invention, it is possible to shorten the data access time of an optical disc and reduce the load on the CPU.

[Brief explanation of drawings]

Figure 1 is a professional diagram showing the configuration of an embodiment of the present invention;
3 is a block diagram showing the configuration of a conventional example, and FIG. 4 is an operational flow diagram of the conventional example. 11...Central processing unit, 12...Main storage device, 13.
・・Optical disk control device, ] 4 ・・Optical disk, 15
・External storage device, 16...CPU interface, 1
7... Internal memory, 18... Optical disk control unit, 1
9...External storage device control unit. Figure 1 Figure 2 27 goes to Sukhumvit

Claims (2)

[Claims] (1) A directory section for managing the data location on the optical disk is stored in an external storage device such as a floppy disk or a magnetic disk, and the central controller reads the directory section and learns the data location on the optical disk. In the optical disk control method, the optical disk control device constantly monitors the ready state of the optical disk and external storage device, and when the optical disk or external storage device becomes ready, it reads the volume name of the device that became ready and performs the corresponding operation. The volume name is stored in a predetermined location provided for each device in the internal memory of the optical disk control device, and when the optical disk and external storage device become ready, the volume names are compared when read from both devices. , an optical disk control method characterized in that when these volume names match, the matched volume name is stored in a predetermined location in an internal memory and a ready state is reported to a central control unit. (2) A directory section for managing the data location on the optical disk is stored in an external storage device such as a floppy disk or a magnetic disk, and the central controller reads the directory section and learns the data location on the optical disk. In the optical disk control method, the optical disk control device receives a mode setting command from the central control device and stores the specified mode, and when the mode is
mode, when the optical disk and external storage device are in the ready state, the volume names read from the same device are compared, and if the volume names match, are they a match? The system stores the system name in the internal memory of the optical disk controller and reports the ready state to the central controller. On the other hand, when the mode is the second mode, the system does not compare the system names and indicates that the optical disk is ready. An optical disk control system characterized by reporting a ready state to a central control unit when the ready state is reached.