JPH06150525A - Magneto-optical disk and its modulation system discrimination device - Google Patents

Abstract

PURPOSE:To provide an magneto-optical disk on which a modulation system is set on the disk itself, to discriminate the modulation system of the magneto- optical disk and to make a magneto-optical disk drive device to execute optimum operation. CONSTITUTION:Control zones 3a and 3b or a data zone 2 of a magneto-optical disk 1 have non-used (non-defined) regions in terms of the ISO standards. The regions (for example, byte 12 of all sectors of all tracks of all control zones) are set as the area in which modulation system information signals are recorded and for example, data '00' for a magnetic field modulation system and data 'FF' for an optical modulation system are recorded during a production. When this magneto-optical disk is installed, the magneto-optical disk drive performs optimum operations for the modulation system of the magneto-optical disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to a magneto-optical disk in which a modulation method can be set for a single disk and a magneto-optical disk drive device which can be commonly used for magneto-optical disks having different modulation methods. The present invention relates to a modulation system discrimination device.

[0002]

2. Description of the Related Art Generally, there are an optical modulation method and a magnetic field modulation method as an information recording method for a magneto-optical disk as an optical information recording medium. In the conventional example of the magneto-optical disk drive device for driving such a magneto-optical disk, since the drive device for optical modulation was developed earlier than the drive device for magnetic field modulation, in general, the optical modulation system is used. Many are designed and produced. On the other hand, in recent years, an overwritable magneto-optical disk drive device has been developed, and a magnetic field modulation method is regarded as a promising modulation method, and a magnetic field modulation method is used. Many.

Since there is no compatibility between the optical modulation system and the magnetic field modulation system, two types of magneto-optical disks corresponding to the optical modulation system and the magnetic field modulation system are required. Magneto-optical disks for optical modulation have already been commercialized, and magneto-optical disks for magnetic field modulation have recently been commercialized.
Further, it is expected to develop a magneto-optical disk drive device capable of recording / reproducing information on the above-mentioned two types of magneto-optical disks with a single device.

FIG. 4 is a plan view showing a commercialized optical modulation magneto-optical disk (a magneto-optical disk configured for the optical modulation system).
The surface (recording surface) of 1 is provided with pre-format sections (control zones) 7a and 7b conforming to the ISO standard and a data recording section (data zone) 6. ISO
According to the standard, detailed information required for a magneto-optical disk such as maximum read power and reflectance of the medium is written in the control zones 7a and 7b at the time of manufacturing. Therefore, by reading the contents (information) written in the control zone, the magneto-optical disk can be driven under the optimum conditions for the magneto-optical disk.

On the other hand, when the magneto-optical disk is a magneto-optical disk for magnetic field modulation (magneto-optical disk configured for magnetic field modulation system) 5-2, in consideration of compatibility, the same as shown in FIG. It has a basic configuration. Therefore, the magneto-optical disk 5-2 for magnetic field modulation, when performing recording / reproducing in the corresponding magneto-optical disk drive device,
The same processing as in the case of the optical modulation magneto-optical disk 5-1 is performed.

In the field of optical discs and optical disc drive devices, when an optical disc in which system information such as maximum reproducing light power value, servo system, disc reflectivity, etc. is recorded in a specific area, the optical disc drive device side is installed. In JP-A-2-156422, a technique for determining whether or not the method of the optical disk is suitable for the optical disk drive based on the method information is disclosed in JP-A-2-156422. Since it is ejected, it is not configured to support a plurality of types of optical disks with a single drive device.

[0007]

[Problems to be Solved by the Invention] However, the above 2
When constructing a magneto-optical disk drive device capable of recording / reproducing information on / from different types of magneto-optical disk, it is necessary to determine the modulation system of the magneto-optical disk mounted on the magneto-optical disk drive device. However, since the conventional magneto-optical disk does not record the information signal indicating the modulation method, the modulation method of the mounted magneto-optical disk cannot be discriminated.

The present invention has been made in view of the above problems, and a magneto-optical disk on which an information signal capable of discriminating the modulation method is recorded in advance, and the modulation method is discriminated by reading the information signal from the magneto-optical disk. Then, it is an object of the present invention to provide a modulation method discriminating device capable of causing a magneto-optical disk drive device to perform an operation suitable for the modulation method of the magneto-optical disk.

[0009]

To this end, the magneto-optical disk of the present invention uses a specific area of the magneto-optical disk as an information signal recording area for recording an information signal representing the modulation system of the magneto-optical disk. The information signal is set and the information signal is recorded in advance in the information signal recording area. Further, the modulation method discriminating device of the present invention is a modulation device for discriminating the modulation method of the magneto-optical disk based on the reading means for reading the information signal previously recorded in the information signal recording area of the magneto-optical disk. It is characterized by comprising a system discriminating means.

[0010]

In the magneto-optical disk, since the information signal representing the modulation method of the magneto-optical disk is recorded in advance in the information signal recording area set in the specific area, the modulation method can be set for the disk alone. . Therefore, regardless of whether the optical modulation magneto-optical disk is used or the magnetic field modulation magneto-optical disk is used, the modulation method used for recording / reproducing of the magneto-optical disk can be accurately determined. Using, the magneto-optical disk drive device that can be commonly used for the magneto-optical disks of the two types of modulation methods can be normally operated.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a plan view showing a structure of a recording surface of a magneto-optical disk of the present invention, and FIG. 2 is a block diagram showing a schematic structure of a magneto-optical disk drive device to which a modulation system discrimination device of the present invention is applied. 3 is a flowchart showing the operation of the magneto-optical disk drive device of FIG. 2 in which the magneto-optical disk of FIG. 1 is mounted.

In the first embodiment, on the surface (recording surface) of the magneto-optical disk 1 of FIG. 1, as in the magneto-optical disk of FIG. 4 applied to the above-mentioned conventional example, the pre-format portion (control zone) 3a. , 3b and a data recording section (data zone) 2 are provided, and the control zone
3a, 3b is based on ISO standard, maximum read power,
Detailed information required for the magneto-optical disk, such as the reflectance of the medium, is to be recorded during manufacturing.

There is an unused area in the control zones 3a and 3b, and that area (for example, byte 12)
In general, the data "FF" is to be recorded. In the first embodiment, the byte 12 is set as an area (information signal recording area) for recording the information signal representing the modulation system, and the information signal representing the modulation system is recorded at the time of manufacturing the disc. Specifically, in the case of the magnetic field modulation method, data “00” is recorded in the byte 12 of the control zones 3a and 3b of the magneto-optical disk 1, and in the case of the optical modulation method,
The data "FF" is recorded in consideration of compatibility with the optical modulation magneto-optical disk already on the market. At this time, the data of "FF" or "00" is recorded in the byte 12 of all sectors of all tracks in all control zones. In such a magneto-optical disk, compatibility is maintained in all magneto-optical disks, and then the modulation method is set for the magneto-optical disk alone.

Next, the magneto-optical disk drive device of FIG. 2 will be described. This magneto-optical disk drive device is a spindle motor that drives the magneto-optical disk 1 to rotate.
10 and a motor drive circuit 11 for driving the spindle motor 10
An optical head 12 for irradiating the recording surface of the magneto-optical disk 1 with laser light and detecting return light of the laser light; a laser drive circuit 13 for driving a laser diode (not shown) of the optical head 12; A servo circuit 15 for driving a linear motor 14 for carrying out focusing servo and tracking servo, and a signal processing circuit for outputting a command signal to the servo circuit 15 based on an input signal from a photodetector (not shown) of the optical head 12. 16 and a signal processing circuit
Reference numeral 16 includes a modulation system discrimination circuit which discriminates the modulation system according to the present invention. The magneto-optical disk drive device includes a mechanism (software, hardware) that operates as an optical modulation method and a mechanism (software, hardware) that operates as a magnetic field modulation method.

Next, the operation of discriminating the modulation method of the magneto-optical disk 1 mounted in the magneto-optical disk drive device of FIG. 2 in the first embodiment will be described with reference to the flowchart of FIG. This flowchart shows the operation from turning on the power until the recording / playback of the magneto-optical disk becomes possible. First, the magneto-optical disk cartridge incorporating the magneto-optical disk 1 is installed in the magneto-optical disk drive device. Attach (insert) (step 1). Here, when the magneto-optical disk cartridge is inserted to the proper position, a sensor (not shown) in the magneto-optical disk drive device is turned on to detect the mounting of the magneto-optical disk 1 (step 2).

After the detection of the disk mounting, the optical head 12 is moved to the control zones 3a and 3b of the magneto-optical disk 1 by the servo circuit 15 and the linear motor 14 (step 3), and then the spindle motor is driven by the motor drive circuit 11.
10 is turned on (step 4), and the laser driving circuit 12 turns on a laser diode (not shown) (step 5).
At this time, the data in the control zones 3a, 3b has not been read yet, and therefore the laser power suitable for the magneto-optical disk is not known, so the laser power is set so as not to destroy the data in the magneto-optical disk. Keep the minimum read power.

When the laser diode is turned on, the data in the magneto-optical disk 1 can be read out, so the data in the byte 12 in the control zones 3a and 3b is read into the signal processing circuit 16 by the optical head 12 ( Step 6). The signal processing circuit 16 determines the modulation method as follows based on the read data of the byte 12.
That is, when the data in byte 12 is "00" (YES in step 7), the magneto-optical disk drive device is determined to be in the magnetic field modulation system and the magneto-optical disk drive device is operated in the magnetic field modulation system (step 8). If it is "FF" (YES in step 9), it is determined to be the optical modulation method, and the magneto-optical disk drive device is operated by the optical modulation method (step 10).
In the case of a defective disk in which the data "00" or "FF" cannot be read from the byte 12 due to scratches on the recording surface, etc., the defective disk is ejected from the magneto-optical disk drive device after performing a predetermined initialization (step 11). In addition,
The steps 3 to 6 correspond to the reading means, and the steps 7 and 9 correspond to the modulation method discrimination means.

After the determination of the modulation method is completed as described above, it is determined whether or not the magneto-optical disk can be actually operated by inspecting the registered name in the ISO standard, for example. In this determination, if it is found that the magneto-optical disk is an unregistered magneto-optical disk, the magneto-optical disk is ejected from the magneto-optical disk drive device.
The magneto-optical disk drive device operates only in the case of the registered regular magneto-optical disk.

Next, a second embodiment of the present invention will be described. In the second embodiment, in the magneto-optical disk 1 of FIG. 1, an area set as an area (information signal recording area) for recording an information signal representing a modulation method and an information signal to be written therein are the above first areas. Although different from the embodiment, the other parts are configured the same as the first embodiment. That is, 0 track 0 of the data zone 2 of the magneto-optical disk 1
Information conforming to the ISO standard and information such as a defective sector are to be recorded in the sector after the magneto-optical disk 1 is formatted, but an area (bytes) not defined in the ISO standard is included in the data zone 2. 2), byte 2 is set as the information signal recording area in this second embodiment, and the information signal representing the modulation method is recorded at the time of manufacturing the disc.

Specifically, byte 2 in the ISO standard
Normally, the data "00" is to be recorded in, so in the case of the magnetic field modulation method, the data "FF" is recorded in the byte 2 of the 0 track 0 sector of the data zone 2 of the magneto-optical disk 1. , In the case of the optical modulation system, considering the compatibility with the optical modulation magneto-optical disk already on the market,
Record the data “00”. In such a magneto-optical disk, the compatibility is maintained in all the magneto-optical disks, and then the modulation method is set for the magneto-optical disk alone (in the second embodiment, data "00", The correspondence between the data "FF" and the modulation method is opposite to that in the first embodiment).

Next, the operation of discriminating the modulation method of the magneto-optical disk 1 mounted in the magneto-optical disk drive device of FIG. 2 in the second embodiment will be described with reference to the flowchart of FIG. In the flowchart of FIG. 3, since the area set as the information signal recording area and the information signal to be written therein are different from those in the first embodiment, the contents of steps 3, 6, 7 and 9 are as follows. Although it will be read again, the other steps are the same as those in the first embodiment, and the description thereof will be omitted.

That is, in step 3, after detecting the disk mounting, the optical head 12 is moved to the data zone 2 in FIG. 2 by the servo circuit 15 and the linear motor 14 instead of the control zones 3a and 3b of the magneto-optical disk 1. Returning to FIG. 3, in step 6, the optical head 12 reads the data of byte 2 of 0 track 0 sector of data zone 2 into the signal processing circuit 16 instead of the data of byte 12 of the control zones 3a and 3b. In steps 7 and 8 respectively,
The determination conditions of the modulation method in the case of the first embodiment are exchanged with each other, the magnetic field modulation method is determined when the data of byte 2 is "FF", and the optical modulation method is determined when the data of byte 2 is "00". To judge. As a result, similarly to the first embodiment, the magneto-optical disk drive device operates by the optical modulation method when the optical modulation magneto-optical disk is mounted, and operates by the magnetic field modulation method when the magnetic field modulating magneto-optical disk is mounted. Become.

The data zone 2 of the magneto-optical disk 1
Since the 0 track of No. 0 is recorded according to the ISO standard at the time of formatting, in the second embodiment, for example, a write-prohibition process is performed by software so that data cannot be recorded in byte 2 of 0 track 0 sector. Keep it. By doing so, it is possible to retain the information signal representing the modulation method recorded in advance without erasing,
It is possible to always discriminate the modulation method of the magneto-optical disk.

Next, a third embodiment of the present invention will be described. In the third embodiment, in the magneto-optical disk 1 of FIG. 1, an area set as an area (information signal recording area) for recording an information signal representing a modulation method and an information signal to be written therein are the above-mentioned first and second areas. Although different from the embodiment, the other parts are configured the same as the first embodiment.

That is, all sectors of all tracks of the control zones 3a and 3b of the magneto-optical disk 1 are required for the magneto-optical disk such as maximum read power and reflectance of the medium according to ISO standard. Since detailed information is to be recorded at the time of manufacturing, in this third embodiment, all sectors of the tracks located at the innermost and outermost circumferences of the entire control zone are set as the information signal recording area. Then, in those tracks, for example, data "CC" is used in the case of the magnetic field modulation method and data "BB" is used in the case of the optical modulation method as an information signal indicating the modulation method.
Record it when the disc is manufactured. In such a magneto-optical disk, the modulation method is set for each magneto-optical disk in all magneto-optical disks. In addition,
The innermost track and the outermost track of the control zone are used as the information recording areas in order to prevent the other recorded data in the control zone from being affected.

Next, in the third embodiment, the operation for discriminating the modulation method of the magneto-optical disk 1 mounted in the magneto-optical disk drive device of FIG. 2 will be described with reference to the flowchart of FIG. In the flow chart of FIG. 3, since the area set as the information signal recording area and the information signal to be written therein are different from those in the first embodiment, the contents of steps 6, 7, and 9 are read as follows. The other steps are the same as those in the first embodiment, so the description thereof will be omitted.

That is, in step 6, the optical head 12 reads the data of all the sectors of the innermost track of the control zone into the signal processing circuit 16 instead of the data of the byte 12 of the control zones 3a and 3b. At that time, if the data cannot be read, the data of all the sectors of the outermost track of the control zone is read into the signal processing circuit 16, and if the data cannot be read, the defective disk is read. Then, the magneto-optical disk is ejected from the magneto-optical disk drive device.

Furthermore, in steps 7 and 8, the modulation system discrimination condition "byte 12 =" 00 "?" Is replaced with "inner circumference (outermost) track =" CC "?", And "byte 12 ="".
"FF"? "Is read as" inner circumference (outermost) track = "BB"? ", And the data of the innermost (outermost) track is" CC "
If it is, the magnetic field modulation method is judged and the innermost circumference (outermost circumference)
If the track data is "BB", it is determined to be the optical modulation method. As a result, like the first embodiment,
The magneto-optical disk drive device operates by the optical modulation method when the magneto-optical disk for optical modulation is mounted, and operates by the magnetic field modulation method when the magneto-optical disk for magnetic field modulation is mounted.

[0029]

As described above, according to the present invention, the specific area of the magneto-optical disk is set as the information signal recording area for recording the information signal representing the modulation system of the magneto-optical disk, and the information signal is recorded. Since the magneto-optical disk is constructed by previously recording the information signal in the recording area, the modulation method can be set for the disk alone. Further, in the modulation method discrimination device, the modulation method used for recording / reproducing of the magneto-optical disk can be accurately discriminated based on the information signal read from the magneto-optical disk. Therefore, by using the determination result, it is possible to normally operate the magneto-optical disk drive device which can be commonly used for the optical modulation magneto-optical disk and the magnetic field modulation magneto-optical disk, for example.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of a recording surface of a magneto-optical disk of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a magneto-optical disk drive device to which the modulation method discrimination device of the present invention is applied.

3 is a flowchart showing an operation of the magneto-optical disk drive device of FIG. 2 in which the magneto-optical disk of FIG. 1 is mounted.

FIG. 4 is a plan view showing a configuration of a recording surface of a conventional magneto-optical disk.

[Explanation of symbols]

 1 surface (recording surface) 2 data recording section (data zone) 3a, 3b preformat section (control zone) 10 spindle motor 11 motor drive circuit 12 optical head 13 laser drive circuit 14 linear motor 15 servo circuit 16 signal processing circuit

Claims (2)

[Claims] 1. A specific area of a magneto-optical disk is set as an information signal recording area for recording an information signal representing a modulation system of the magneto-optical disk, and the information signal is recorded in advance in the information signal recording area. A magneto-optical disk characterized by being formed. 2. A reading means for reading an information signal previously recorded in an information signal recording area of the magneto-optical disk according to claim 1, and a modulation method discrimination for discriminating a modulation method of the magneto-optical disk based on the read information signal. And a modulation method discriminating device.