JPS61250747A - Data management system of photomagnetic disc device - Google Patents

Abstract

PURPOSE:To improve the processing speed of a system having a photomagnetic disc device by recording a data being an information recording signal onto a disc based on a management data stored in advance in a management data memory. CONSTITUTION:When a drive controller 2 is started, a control circuit 21 sends a command to a photomagnetic disc, accesses a data management area of the disc, reads the management data via a drive interface 5 and transfers the data to the management data memory 6. Then a write command is outputted from a host computer and the management data is to be rewritten, then a new management data from the host computer is inputted to a corresponding memory area in the memory 6 via a host interface 4 and rewritten. The management data memory 6 is accessed periodically and the data is sent to the photomagnetic disc device via the drive interface 5 and recorded on the data management area on the disc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data management system for a magneto-optical disk device that records, φ reproduces, or erases information using management data recorded on a disk of the magneto-optical disk device.

[Prior Art] A magneto-optical disk device is a rewritable information recording device that uses magneto-optics. However, it is difficult to perform so-called override on recorded information, and various methods have been proposed for managing data such as information recording signals (for example, Japanese Patent Laid-Open No. 59-2150).
08 Publication), FIG. 4 shows an example of such a conventional data management method. 101 is a semiconductor laser, and 102 is a laser driver, which irradiates a light beam onto the disk 107 through an optical system including a collimator lens 103, an ahalf mirror 1041, a reflection mirror 105, an objective lens 106, and the like.

108 is a spindle motor that rotates the disk 107;
109 is a focus detection optical system. 110 is a coil that generates a bias magnetic field, and 111 is a coil driver that operates the coil. According to the prior art shown in FIG.
High speed and large amount of information recording signal (hereinafter referred to as data) 1
12 optically modulates the semiconductor laser 101 to generate a disk 107;
is irradiated and recorded. on the other hand.

Management data 113, which is a small amount of data such as directories and management information, is sent to the coil 1 via the coil driver 111.
1O and recorded on the disk 107 by magnetic field modulation. According to the magnetic field modulation method described above, since the disk 107 is magnetized according to the polarity of the magnetic field and recording is performed, overriding is possible as in normal magnetic recording. Therefore, for management data that is a small amount of data, the data transfer efficiency of the magneto-optical disk device can be improved by using the above-mentioned magnetic field modulation method.

However, the above-mentioned prior art has the following problems.

(1) In order to record various types of information using the magnetic field modulation method, it is necessary to generate a magnetic field of several hundred oersted on the disk, but the inductance of the coil for this is several millihenries, and the high speed It is difficult to perform magnetic field modulation.

(2) When recording various types of information using magnetic field modulation and when recording various types of information using optical modulation, the respective modulation frequencies must be changed, and the constants of the demodulator must also be changed when reproducing information. This makes the circuit system complicated.

(3) Since a large current of about 1 to 2 amperes is turned on and off to drive the coil, it adversely affects the surroundings as electromagnetic noise.

In addition, in view of the difficulty of overriding in magneto-optical disk devices that have the above-mentioned problems, if a method is used to rewrite management data or data without overriding, it is recommended that the management data be temporarily erased and then the new management data be rewritten. An operation for recording data and an operation for temporarily erasing data and then recording new data are performed. Therefore, for each rewriting operation, the disk is rotated twice to transfer data, and W is given access to the data management area located on the inner or outer circumference of the disk, and the data recording area. It is necessary to perform the access twice, and the rewriting operation is complicated and inefficient.

[Means and operations for solving the problems] In view of the above problems, the present invention provides a magneto-optical disk device, a host computer thereof, and a magneto-optical disk device that connects the host computer and the magneto-optical disk device. A drive control device (hereinafter referred to as a drive controller) is visible, and the drive controller further includes a storage means (hereinafter referred to as a management data memory) for storing information stored in a data management area of a disk of a magneto-optical disk device. A magneto-optical disk device is provided in which management data is stored in a management data memory in advance when data, which is an information recording signal, is recorded on the disk, and the data is recorded on the disk based on the stored management data. This provides a method for data management.

Furthermore, according to the present invention, the management data is stored in the management data memory at the time of initial setting of the operation of the drive controller (hereinafter referred to as initialization time), or the management data is stored in the management data memory. If the drive controller is not performing any processing on the magneto-optical disk device, and the drive controller stores any instruction signal such as a timer signal or an output signal of a counter that counts the number of data bags received. This is done by periodically transferring and recording from the management data memory of the drive controller to the data management area of the disk based on the above, or the management data stored in the management data memory can be exchanged with the disk of the magneto-optical disk device. In this case, upon receiving a disk exchange command from the host computer, the data is transferred from the management data memory to the data management area of the disk and recorded, and then the drive controller performs the disk exchange operation.

FIG. 1 shows a conceptual diagram of the present invention. 1 is a host computer, 2 is a drive controller, 3 is a magneto-optical disk device, 4 is a host interface that connects the host computer ml and the drive controller 2, and 5 is a drive interface that connects the drive controller 2 and the magneto-optical disk device 3. do. Reference numeral 6 indicates a management data memory that the drive controller 2 has. Management data memory 6
is a disk (not shown) provided in the magneto-optical disk device 3
Stores data management information such as directory information recorded in the data management area. According to the present invention, when changing the management data on the disk, the management data is stored in the drive controller 2 in advance without directly changing the management data recorded in the data management area of the disk. The function is to store the management data in the data memory 6, rewrite the corresponding part of the stored management data, and then periodically transfer and record the rewritten new management data to the data management area of the disk at an appropriate time. It is what you do. Furthermore, the management data memory 6 is used not only to rewrite the management data recorded in the data management area of the disk as described above, but also to temporarily convert the management data into code, or to store the data in the directory as necessary. It is also possible to use it as an information retrieval memory or a virtual memory.

[Embodiment] FIG. 2 is a block diagram showing the configuration of a drive controller as an embodiment of the present invention. The drive controller 2 has a built-in management data memory 6. 20 is a host interface control unit connected to the host interface 4; 21 is a control circuit; 22 is a direct memory access (hereinafter referred to as DMA) controller; 23 is a buffer memory; 24 is a drive interface control unit connected to the drive interface 5; 242 is a data bus, 242 is an address bus, 243 is a control bus, 25 is a modulation/demodulation circuit, 26 is a serial/parallel conversion circuit, 2
7 is an error correction circuit (hereinafter referred to as ECC).

The operation of the above embodiment will be described below with reference to FIG. 3, which shows a chart.

When the drive controller 2 is activated, it enters into an initialization routine 41 operation shown in FIG. The drive controller 2 performs a self-diagnosis to determine whether or not the controller operates normally (FIG. 4 42), and if there is no abnormality, the control circuit 21 transmits the magneto-optical Send a command (directory command) to the disk (not shown) to access the data management area of the disk.
3) The management data is read out via the drive interface 5 and the drive interface control section 24 (FIG. 44), and the management data is demodulated by the modulation/demodulation circuit 25. The demodulated management data is converted into parallel data by the serial/parallel conversion circuit 26, error corrected by the ECC 27, and then stored in the management data memory 6 by the DMA controller 22.
(Fig. 4, 45).

yP11'-bot;1kf+'tfklhfrCAshi;;
-4←jq) 411g4se, 'QIL, M Mantle is output and the case where management data is rewritten will be explained.

The corresponding memory area in the management data memory 6 of the drive controller 2 is rewritten by inputting new management data from a host computer or the like via the host interface 4, host interface control section 20, and control circuit 21. The management data memory 6 storing new management data is periodically accessed by a timer built in the control circuit 21 and sent to the magneto-optical disk device via the drive interface control unit 5 and the drive interface 5 to manage data on the disk. recorded in the area. Instead of a timer, according to the set value of a counter that counts the number of times data such as information recording signals on the disk is rewritten, new management data is sent to the magneto-optical disk device to rewrite the management data when a predetermined number of rewrites is reached. , it can also be recorded in the data management area on the disc. In addition, for magneto-optical disk devices whose disks can be exchanged, when a disk exchange command is output from a host computer or the like, an optical signal is sent from the management data memory 6 via the drive interface 24, etc. New management data can be sent to the magnetic disk device and recorded in the data management area on the disk.

According to this embodiment, however, new management data is not rewritten (changed) directly in the data management area on the disk as in the past, but in the management data memory in the drive controller 0-RA 2. 6, the data management area on the disk does not need to be changed each time, and the rewriting (change) of the management data on the disk is performed using data that is an information recording signal. This is done at a sufficiently low cycle compared to the number of rewrites in
Compared to the conventional technology in which certain data and management data are rewritten bare, the operating efficiency of a system including a magneto-optical disk device can be significantly improved.

In the present invention, the information recording and reproducing device has been described as a magneto-optical disk device, but the technical idea of the present invention can also be widely applied to erasable optical disk devices that utilize phase change. [Effects of the Invention] According to the present invention, a memory for storing information on a data management area on a disk is provided in a drive controller of a magneto-optical disk device, and when data is changed, the information on the data management area on the disk is not directly rewritten. Since the management data is rewritten by changing the information in the data management area stored in the memory, it is effective in improving the processing speed of a system having a magneto-optical disk device and providing an easy-to-use system. .

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of the present invention, FIG. 2 is a block diagram showing an embodiment, FIG. 3 is a flowchart explaining the operation of the embodiment, and FIG. 4 is a configuration diagram explaining the prior art. 1...Host computer 2...Drive controller 3...Magneto-optical disk device 6...Management data memory Patent applicant Olympus Optical Industry Co., Ltd. Figure 1 6 Management data memory 1g3 Diagram

Claims (4)

[Claims] (1) A magneto-optical disk device, a host computer thereof, and a drive control device for the magneto-optical disk device that connects the host computer and the magneto-optical disk device; A storage means for storing information stored in a data management area of a disk of the device is provided, and when recording data on the disk, management data is stored in advance in the storage means of the drive control device, and the stored management data is stored in the storage means of the drive control device in advance. A data management method for a magneto-optical disk device, characterized in that data is recorded on a disk based on the data. (2) A data management method for an optical disk device according to claim 1, wherein the management data is stored in the storage means of the drive control device at the time of initial setting of the operation of the drive control device. (3) The management data stored in the storage means of the drive control device is stored in the case where the drive control device is not performing any processing on the magneto-optical disk device, and the drive control device has a timer or a data rewrite count. According to claim 1, the data is periodically transferred from the storage means of the drive control device to the data management area of the disk and stored based on an instruction signal from any one of the counters that count the . A data management method for magneto-optical disk devices. (4) When the disk of the optical disk device is replaceable, the management data stored in the storage means of the drive control device is transferred from the storage means of the drive control device in response to a disk exchange command from the host computer. 2. A data management system for a magneto-optical disk device according to claim 1, wherein the data is transferred and recorded to a data management area of a disk, and then the drive control device performs an operation of exchanging the disk.