JPH09102174A - Disk device system and disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To read in data at a high speed and to improve the reliability of data reading out by recording the same data in recording regions formed by division and arranging a plurality of data reading means. SOLUTION: A magneto-optical disk 60 is provided with inner and outer side storage regions 60A and 60B not overlapping each other and the same data is stored in these regions. Optical pickups 61, 62, 63 and 64 are arranged at the intervals of 90 deg., the optical pickups 61 and 63 move the region 60A and the pickups 62 and 64 move the region 60B both in a radial direction. Thus, even when an error occurs in one optical pickup, backing up is performed by another optical pickup and the reliability of data reading is improved. Also, the moving distance of the optical pickup in the radial direction is shortened and thus, a moving time to a specified position is also shortened and data reading is performed at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. TECHNICAL FIELD OF THE INVENTION Conventional Technology (FIGS. 10 to 13) Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 to 9B) Embodiments of the Invention (1) Optical Disk Recording Structure of reproducing apparatus (FIGS. 1 and 2) (2) Arrangement state of optical pickups with respect to the magneto-optical disk according to the first embodiment (FIGS. 3A, 3B and 4) (3) According to the second embodiment Arrangement State of Optical Pickup on Magneto-Optical Disk (FIG. 5) (4) Arrangement State of Optical Pick-up on Magneto-Optical Disk (FIG. 6 and FIGS. 7A to 7C) (5) Optical Disk Recording Recording method in playback device (Fig. 8)
And FIGS. 9 (A) and 9 (B)) (6) Other Examples Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device system and a disk device, and is preferably applied to a disk device system and a disk device such as a video server for reproducing a plurality of information from a disk-shaped recording / reproducing medium at high speed. Is.

[0003]

2. Description of the Related Art Conventionally, as a disk device of this type, for example, a compact disk (CD) other than a video server.
There are a reproducing device for reproducing predetermined information from an optical disc, a recording / reproducing device for recording or reproducing predetermined information on a hard disk (HD), and the like.

As shown in FIG. 10, an optical disk 1 comprises an organic dye-based thin film 2 formed on one surface of a polycarbonate disk-shaped substrate, and the thin film 2 is intermittently irradiated with a light beam so that the thin film 2 is sequentially irradiated. The pit 3 is formed along the spiral recording track. This reproducing apparatus for an optical disk drives an optical pickup while rotating the optical disk at a desired rotational speed to reproduce desired data from the optical disk.

As shown in FIG. 11, the optical pickup 5 is
The laser diode 6 is driven based on a drive signal output from a driver (not shown), and the light beam L1 emitted from this laser diode 6 is converted into a polarized light beam by the diffraction grating 7. The optical pickup 5 guides the light beam L1 to the objective lens 10 via the half mirror 8 and the collimator lens 9, and the objective lens 10 focuses the light beam L1 on the optical disk 1. As a result, the reproducing device can operate the laser diode 6
The light beam L1 is focused on the recording surface of the optical disc 1 so that desired data can be reproduced.

At this time, the optical pickup 5 receives the reflected light of the optical disc 1 by the objective lens 10, guides it to the collimator lens 9 and the half mirror 8, and reflects it. Further, the optical pickup 5 makes the reflected light enter the concave lens 11,
The emitted light is focused on the photodetector 12. Thus, the photodetector 12 reads out desired data from the optical disc 1 by detecting a change in the amount of reflected light of the optical disc 1 based on the emitted light.

Further, as shown in FIG. 12, the hard disk 2
In No. 0, the magnetic bodies 21A and 21B are coated on both sides, and the recording tracks 22A and 22B are concentrically formed by magnetically recording on the magnetic bodies 21A and 21B. The recording / reproducing device for this hard disk is
The magnetic head is driven while the hard disk 20 is rotationally driven at a desired rotational speed to record or reproduce desired data from the hard disk 20.

As shown in FIG. 13, the magnetic head 25 has a structure in which a coil 25 having a predetermined number of turns is wound around a core 25A having a gear 25B formed therein. In this magnetic head 25, by passing an alternating current through the coil 26 and passing it through a head surface having a gear 25B,
The recording track 22A (22B) is magnetically recorded on the magnetic body 21A (21B) of the hard disk 20, or the change in magnetization in the magnetically recorded recording track 22A (22B) is read out.

[0009]

By the way, in such a reproducing apparatus for an optical disk and a recording / reproducing apparatus for a hard disk, the shapes and recording principles of recording tracks formed on the optical disk and the hard disk are various. However, even if any of the conventional methods is used, there is a limit in improving the reading speed of recorded data.

That is, as a method of improving the data reading speed, a method of increasing the rotation speed of the optical disk with respect to the pickup and a rotation speed of the hard disk with respect to the magnetic head, and recording in the directions along the recording tracks of the optical disk and the hard disk, respectively. There is a way to increase the density.

However, since the intensity of the laser beam applied to the optical disk is limited, the operating speed of the magnetic head is limited, and the noise generated at the time of reproduction with respect to the recording signal is increased. There are still insufficient problems with these methods.

As a method for solving this problem, a method is conceivable in which the data recorded by using a plurality of optical pickups and a plurality of magnetic heads are simultaneously read to improve the reading speed substantially.
Due to the physical limits on the number of optical pickups and magnetic heads that can be arranged for the optical disk and the hard disk, respectively, there is a problem that the data reading speed cannot be sufficiently improved.

As another method for solving this problem, a so-called mirroring method in which the same data is multi-recorded using a reproducing apparatus for a plurality of optical disks and a recording / reproducing apparatus for a plurality of hard disks is also considered. In general, the reliability in recording and reproducing data can be improved. Also in this case, the read speed can be substantially improved by simultaneously reading the data recorded by using the plurality of optical pickups and the plurality of magnetic heads, but a large number of devices are required in proportion thereto. Therefore, the configuration of the entire apparatus may be complicated.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a disk device system and a disk device which can read data at high speed and improve reliability in data reading.

[0015]

In order to solve such a problem, the present invention has a recording area divided into a plurality of areas which do not overlap each other, and the same data is recorded in each of the divided areas. With respect to the disk-shaped recording medium formed as described above, each data read by a plurality of data reading means arranged in each area of the disk-shaped recording medium is demodulated by one or a plurality of demodulation means.

Further, in the present invention, a disk-shaped recording medium having a recording area divided into a plurality of areas which do not overlap each other, and different data is recorded a plurality of times in each of the divided areas, Of the plurality of data reading means arranged in each area of the recording medium, the data read by one data reading means for each area is a series of data that is temporally continuous over all areas. After combining as described above, the one series of data is demodulated by one or a plurality of demodulation means.

In this way, when a plurality of data reading means are arranged in each area of the disk-shaped recording medium, a read error occurs in one of the plurality of data reading means. Even so, other data reading means can be applied for backup, and thus data can be read at high speed and reliability in data reading can be improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Structure of Optical Disk Recording / Reproducing Device In FIG. 1, reference numeral 30 denotes an optical disk recording / reproducing device,
A cartridge 33 having a built-in magneto-optical disc 32 can be housed through an opening 31 provided on one side surface. That is, the card cartridge 33 housed in this device is mounted at a predetermined position by a loading unit (not shown), and the magneto-optical disk 32 inside the cartridge cartridge 33 is aligned with the optical pickup.

In this state, the optical disk recording / reproducing apparatus 30 applies a desired data to the magneto-optical disk 32 by applying a magnetic field modulation method, that is, a method of modulating the magnetic field at high speed according to an input signal to determine the direction of the magnetic field. Thermomagnetic recording is performed, and the recorded data is reproduced using the Kerr effect.

That is, the optical disc recording / reproducing apparatus 30 is
At the time of data recording, a light beam is continuously applied to the magneto-optical disk 32 while a predetermined modulation magnetic field is applied, whereby a thermomagnetic recording method is sequentially applied to the irradiation position of the light beam to form a perpendicular magnetization region, It is designed so that desired data can be recorded.

When reproducing data, the magneto-optical disk 32 is used.
The reflected light obtained by irradiating the recording surface with the light beam has a direction in which the plane of polarization of the reflected light slightly rotates in the forward and reverse directions depending on the magnetization polarity of the light beam irradiation position. Is decomposed into light components in two directions whose directions change. As a result, the optical disc recording / reproducing apparatus 30 receives the light components in the two directions by the light receiving elements (not shown), and based on the light amount difference between the two light receiving elements, depending on the magnetization polarity of the light beam irradiation position. A reproduction signal whose signal level changes is obtained, and desired data can be reproduced by processing the reproduction signal by a predetermined signal processing circuit (not shown).

After that, the cartridge 33 mounted in the apparatus is discharged from the predetermined position where it is mounted by the loading portion to the outside through the opening 31.

Here, the optical block 35 in the optical disk recording / reproducing device 30 has a structure as shown in FIG. The optical block 35 rotationally drives the magneto-optical disc 32 at a predetermined rotation speed by a spindle motor 37, which is driven and controlled by a motor drive circuit 36, and in this state irradiates the magneto-optical disc 32 with a light beam. It is designed so that desired data can be recorded and reproduced.

In this case, the optical pickup 38 is attached to the guide shaft 40 provided inside the U-shaped member 39, and based on the propulsive force given from the actuator 41 under the control of the control unit (not shown). Guide shaft 4
It can move in parallel with the radial direction of the magneto-optical disk 32 along 0.

As a result, at the time of data recording, desired recording data S1 given to the recording conversion circuit 43 from the outside through the input terminal 42 is converted into a predetermined control signal S2 in the recording conversion circuit 43, and LD (Laser) Diode) driver (not shown). The LD driver controls a laser diode (not shown) built in the optical pickup 38 based on the control signal S2, and the control unit drives and controls the actuator 41 to control the optical pickup 38.
Is moved in the radial direction of the magneto-optical disk 32 to irradiate the magneto-optical disk 32 with a light beam.

At the same time, a magnetic head drive unit (not shown) drives a magnetic field generating coil (not shown) based on desired recording data, so that the magneto-optical disk 3
A predetermined modulation magnetic field is applied to the irradiation position of the two light beams, and desired data can be recorded by applying the magnetic field modulation method.

When data is reproduced, the optical pickup 38 is used.
After the reflected light obtained by irradiating the light beam is decomposed into light components in two directions in which the directions of the polarization planes change complementarily and the light is received by a predetermined light receiving element incorporated in the optical pickup 38, The reproduction conversion circuit 4 reproduces the reproduction signal S3 which is the light reception result.
4 The reproduction conversion circuit 44 receives the reproduction signal S3.
After the reproduction data S4 whose signal level changes according to the magnetization polarity of the light beam irradiation position is generated based on the light amount difference between the two-direction light components obtained from the Output.

(2) Arrangement of Optical Pickups on the Magneto-Optical Disk According to the First Embodiment FIG. 3A shows the optical disk recording / reproducing apparatus 30 shown in FIG.
4 has the same structure as the optical pickup 38.
The figure shows the case where the individual optical pickups 50, 51, 52 and 53 are arranged at intervals of 90 ° with respect to the magneto-optical disk 32.

Each optical pickup 50, 51, 52 and 5
3, a U-shaped member 39 and a guide shaft 40 are attached respectively, as in FIG.
Therefore, desired data can be read from an area 32A in which data is recorded (hereinafter, referred to as a recording area) 32A.

In this case, the data read from the recording area 32A is, for example, a fixed amount of digital data handled by a computer or data of which the data amount is determined in advance, such as data for one frame of a television signal, and the magneto-optical disc 32. Above, for example, as shown in FIG. 3B, an arc-shaped area (hereinafter referred to as a read area) 32B of the recording area 32A is used to distinguish the read area 32B from other recording areas 32A. It is recorded together with the address data.

Further, in FIG. 4, two magneto-optical disks 32 are mounted in parallel in an optical disk reproducing device (not shown),
For each of the magneto-optical disks 32, four optical pick-ups 50, 51, 52 and 53, and four optical pick-ups 54, 55 in the same arrangement as these, are provided.
This is a case where 56 and 57 are arranged. In the case of this embodiment, the same reading area 32B is recorded in each magneto-optical disk 32.

In the above configuration, each optical pickup 5
The actuators 0 to 53 are respectively driven by an actuator (not shown) and moved along the radial direction of the magneto-optical disk 32 to a radial position corresponding to the read area 32B. Further, when the read area 32B is aligned with the rotation position corresponding to each of the optical pickups 50 to 53 as the magneto-optical disk 32 rotates, data is read from the read area 32B, whereby a plurality of optical pickups 50 are read. ~ 5
Even if a read error occurs in one of the three optical pickups, the other optical pickups can be applied for backup.

According to the above configuration, the magneto-optical disk 32
One of the plurality of optical pick-ups 50 to 53 is arranged by arranging a plurality of optical pick-ups 50 to 53 and reading out desired data jointly from the reading area 32B using the respective optical pick-ups. Even if a read error occurs in the above optical pickup, another optical pickup can be applied for backup and thus the reliability in data reading can be improved.

Further, four optical pick-ups 50 to 53 and four optical pick-ups 54 to 57 are arranged respectively for the two magneto-optical disks 32, and the eight optical pick-ups 50 to 57 are used. By making it possible to jointly read desired data from the respective reading areas 32B,
Even if a read error occurs in one of the plurality of optical pick-ups 50 to 53, another optical pick-up can be applied for the back-up and thus the reliability in data reading can be improved. You can Furthermore, 4 for one magneto-optical disk 32
Reading can be performed at a remarkably high speed as compared with the case of using the individual optical pickups 50 to 53.

(3) Arrangement of Optical Pickups for Magneto-Optical Disks According to Second Embodiment The magneto-optical disk 60 shown in FIG. 5 has two inner and outer recording areas that do not overlap each other (hereinafter, these are inner recording areas and Called the outer recording area) 60A and 6
0B, and the same data is recorded in both the inner recording area 60A and the outer recording area 60B.

In the case of this embodiment, of the four optical pick-ups 61, 62, 63 and 64 arranged at 90 [deg.] Intervals with respect to the magneto-optical disk 60, the optical pick-ups 61 and 63 are the inner recording areas 60A. And the optical pickups 62 and 64 can be moved in the outer recording area 60B in the radial direction.

According to the above construction, the recording area of one magneto-optical disk 60 is divided into the inner recording area 60A and the outer recording area 60B to record the same data, and the inner recording area 60A and By reading out two optical pick-ups for each of the outer recording areas 60B, eight optical pick-ups 50 to 57 are used for two magneto-optical disks 32 in the second embodiment. Is substantially equivalent to
Therefore, as in the second embodiment, two magneto-optical disks 32 are used.
It is not necessary to use.

Further, even if a read error occurs in one of the plurality of optical pickups 61 to 64, another optical pickup can be applied for backup and thus reliability in data reading can be improved. Can be improved. Furthermore, each light pickup 6
Since the moving distances 1 to 64 in the radial direction are only on one side of the recording area, the structure of the respective optical pickups 61 to 64 can be simplified and the time to move to a predetermined position can be greatly shortened, and thus the speed is remarkably high. The desired data can be read with.

(4) Arrangement State of Optical Pickups for Magneto-Optical Disks According to Third Embodiment FIG. 6 shows that two magneto-optical disks 70 are mounted in parallel in an optical disk reproducing device (not shown). Four optical pick-ups 71, 72, 73 and 74, which are arranged at 90 [°] intervals with respect to the magneto-optical disk 70, respectively, and four in the same arrangement as these. The optical pickups 75, 76, 77, and 78 of FIG. In this embodiment, each magneto-optical disk 70 has an inner recording area 70A and an outer recording area 70B, and different data is recorded in the inner recording area 70A and the outer recording area 70B.

Further, two reproduction conversion circuits 80 and 81 and two reproduction conversion circuits 82 and 83 are provided for each magneto-optical disk 70. Reproduction conversion circuit 8
0 indicates that the respective data D1 and D2 read by the optical pickups 71 and 72 become one series of data that is temporally continuous over all recording areas (in this case, the inner recording area 70A and the outer recording area 70B). Join (hereinafter,
This is called data combination), and then this is combined data D
3 is supplied to the outside through the output terminal 84,
The reproduction conversion circuit 81 combines the data D4 and D5 read by the optical pickups 73 and 74, and then supplies the combined data D6 to the outside as the combined data D6.

On the other hand, the reproduction conversion circuit 82 outputs the respective data D7 and D8 read by the optical pickups 75 and 76.
Data is coupled to the outside through the output terminal 86 as the coupled data D9, and the reproduction conversion circuit 83 performs data coupling on the respective data D10 and D11 read by the optical pickups 77 and 78, and then outputs this. The combined data D12 is supplied to the outside via the output terminal 87.

Here, FIGS. 7A to 7C show how the reproduction conversion circuit 80 generates combined data D3 by combining the different data D1 and D2 read out by the optical pickups 71 and 72. It is shown. That is, the reproduction conversion circuit 80 reads the data D1 (FIG. 7A) in which the header H ₁ is formed at the head read from the optical pickup 71 and the optical pickup 7
The data D2 (= data D1 + data D2) having the header H ₃ formed at the beginning is combined by data-combining the data D2 having the header H ₂ formed at the beginning (FIG. 7B). To generate.

According to the above construction, the recording areas of the two magneto-optical disks 70 are respectively replaced by the inner recording areas 70.
A and the outer recording area 70B are divided into two areas, and different data are recorded in each area, and four optical pickups 71 to 7 are provided for each of the two magneto-optical disks 70.
4 and 75 to 78 are arranged, and each magneto-optical disk 7 is arranged.
0A inner recording area 70A and outer recording area 70B
For each of the two magneto-optical disks 32 in the second embodiment, the data obtained as a result of being read out by using two optical pick-ups for each of them are combined. This is equivalent to doubling the number of optical pickups as compared with the case of accessing using the optical pickups 50 to 57.

Further, even if a read error occurs in one of the plurality of optical pickups 71 to 74 and 75 to 78, another optical pickup can be applied for backup and thus data reading can be performed. The reliability in can be improved. Further, since the moving distances of the optical pickups 71 to 74 and 75 to 78 in the radial direction are only the recording area on one side, the configuration of the respective pickups 71 to 74 and 75 to 78 can be simplified and moved to a predetermined position. It can save a lot of time,
Thus, the desired data can be read out at a much higher speed.

(5) Recording Method in Optical Disk Recording / Reproducing Apparatus Next, the recording area of a disk-shaped recording medium such as a magneto-optical disk and a hard disk is divided into a plurality of areas which do not overlap each other, and the same area is provided in each area. Alternatively, a recording method for recording different data will be described.

As the first recording method, for example, in the inner recording area 60A in the magneto-optical disk 60 as shown in FIG.
When the same data is recorded in both the outer recording area 60B and the outer recording area 60B, the inner recording area 60A and the outer recording area 60B are recorded.
6 optical pickups, two for each
One of the optical pick-ups 1 and 63 and the optical pick-ups 62 and 64 is used to record the inner recording area 60.
There is a method of recording the same data in both the A and outer recording areas 60B. According to this method, the time required to record data is the same as the time required to record a magneto-optical disk whose recording area is not divided with one optical pickup.

As a second recording method, the method shown in FIG.
A so-called removable device in which one magneto-optical disc 60 and two magneto-optical discs 70 shown in FIG. 6 are housed in one cartridge and can be attached to and detached from an optical disc recording / reproducing device (not shown). There is a method of applying a data recording method similar to the first recording method to the magneto-optical disk. Incidentally, FIG. 8 shows a removable magneto-optical disk 90 in which two magneto-optical disks 91 and 92 are accommodated in parallel.

According to this method, the same or different data is recorded in the predetermined number of magneto-optical disks by the first recording method, and the predetermined number of removable disks storing the predetermined number of magneto-optical disks. By mounting the magneto-optical disc on a predetermined number of reproducing devices, it is not necessary to have a recording function in each of these reproducing devices, and thus the reproducing device having a relatively simple structure is used to reproduce the magneto-optical disc. be able to.

Further, as a third recording method, the inner recording area 60A of the magneto-optical disk 60 in the first recording method is used.
This is a method of recording the same data in both of the recording areas even when the data is not recorded in only one of the outer recording area 60B and the outer recording area 60B. If data is not recorded in only one recording area like this,
When a plurality of magneto-optical disks are recorded by a single recording device, or when recording is performed without dividing the recording area of the magneto-optical disk, a single optical pickup is recorded by dividing the magneto-optical disk. Although it is possible to access all of the areas, it is considered that it is not possible to record in all the recording areas at one time, and it is impossible to record in a single recording area at one time.

Specifically, in FIG. 9A in which parts corresponding to those in FIG.
As shown in FIG. 9B, the spindle motor 95 is driven to rotate at a predetermined rotation speed. Further, the optical pickups 62 and 64 are the guide shafts 9 provided inside the U-shaped members 96 and 97, respectively, as in FIG.
8 and 99 so that they can move along the guide shafts 98 and 99 parallel to the radial direction of the magneto-optical disk 60 based on the propulsive force given by an actuator (not shown) (FIG. 9). (B)).

In this case, the length of the guide shaft 98 is such that the optical pickup 62 has an inner recording area 60A and an outer recording area 6a.
The length of the guide shaft 99 is set so that the optical pickup 64 can access the outer recording area 60B. As a result, in the first recording method, the inner recording area 60A and the outer recording area 60B of the magneto-optical disk 60 are formed.
Even if data is not recorded in only one of the recording areas, the one optical pickup 62 can access both recording areas, and thus the same data can be recorded in both recording areas. .

Further, as a fourth recording method, the recording area of the disk-shaped recording medium is divided into a plurality of areas which do not overlap each other, and data is recorded in one area of the areas, and subsequently, the data is recorded in the area. There is a method of recording the data in another area while reproducing the data, and similarly reproducing the recorded data one by one and simultaneously recording the data one by one.

Specifically, referring to FIGS. 9A and 9B, after the desired data is recorded in the outer recording area 60B by using the optical pickup 62, the optical pickup 64 is used to reproduce the data. By recording the same or different data in the inner recording area 60A, the pick-up 62 can record and reproduce data from the magneto-optical disk 60 at the same time by using one recording and reproducing device.

Further, as a fifth recording method, in addition to the fourth recording method, data is recorded in a necessary number of areas with respect to a predetermined number of areas in which no data is recorded, and the data is already reproduced. There is a method of sequentially erasing the recorded area or the area in which data with a low reproduction request is recorded. According to this recording method, it is possible to increase the number of areas in which data with a high reproduction request is recorded, and therefore it is not necessary to prepare a separate disk-shaped recording medium, and the data reading speed is increased. be able to. Further, it is possible to reduce the number of areas in which data with a low reproduction request is recorded, and thus it is possible to effectively utilize the capacity of the entire recording area.

By the way, in the case of a disk-shaped recording medium in which data is previously recorded by molding such as a compact disk, reproduction may be performed by using a reproducing device equipped with a plurality of optical pickups. .

(6) Other Embodiments In the first to third embodiments, the case where the number of the optical pickups as the data reading means is arranged four for each magneto-optical disk has been described. However, the present invention is not limited to this, and may be two, three, five or more in addition to four. That is, a plurality of optical pickups may be arranged according to the number of divided recording areas in the magneto-optical disk.

In the first to third embodiments, the case where the magneto-optical disk is used as the disk-shaped recording medium has been described, but the present invention is not limited to this, and the hard disk (HD), compact disk (CD), CD-ROM
(Read Only Memory), CD-I (Interactive), C
Various disk-shaped recording media such as D-WO (Write Once) and EB (electronic book) may be used.

Further, in the second and third embodiments, the case where the recording area of the magneto-optical disk is divided into two areas, that is, the inner recording area and the outer recording area has been described. The recording area of the magnetic disk may be divided into three or more predetermined areas, and the recording areas may be provided on both sides of the magneto-optical disk. In this case, it is necessary to arrange a plurality of optical pickups in each area.

Further, in the first and third embodiments, 2
I described the case where two magneto-optical disks were installed side by side.
The present invention is not limited to this, and two magneto-optical disks may be arranged in a two-layer structure. Further, three or more magneto-optical disks may be provided in parallel or stacked.

[0061]

As described above, according to the present invention, a disk-shaped recording having a recording area divided into a plurality of areas which do not overlap each other, and the same data is recorded in each of the divided areas. By disposing a plurality of data reading means in each area of the disk-shaped recording medium, even if a read error occurs in one of the plurality of data reading means. Other data reading means can be applied for backup, thus reading data at high speed and improving reliability in data reading.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the configuration of an optical disc recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration of an optical block according to the present invention.

FIG. 3 is a plan view showing an arrangement state of optical pickups with respect to the magneto-optical disk according to the first embodiment.

FIG. 4 is a plan view showing an arrangement state of optical pickups with respect to the magneto-optical disk according to the first embodiment.

FIG. 5 is a plan view showing an arrangement state of optical pickups on a magneto-optical disk according to a second embodiment.

FIG. 6 is a plan view showing an arrangement state of optical pickups on a magneto-optical disk according to a third embodiment.

FIG. 7 is a schematic diagram for explaining data combination in the third embodiment.

FIG. 8 is a perspective view showing a configuration of a removable magneto-optical disk.

9A and 9B are a plan view and a side view showing an embodiment of a data recording method.

FIG. 10 is a partial cross-sectional view showing the configuration of a conventional optical disc.

FIG. 11 is a block diagram showing a configuration of a conventional optical pickup.

FIG. 12 is a partial cross-sectional view showing the structure of a conventional hard disk.

FIG. 13 is a block diagram showing a configuration of a conventional magnetic head.

[Explanation of symbols]

30 ... Optical disc recording / reproducing device, 32, 60, 70,
91, 92 ... Magneto-optical disk, 32A ... Recording area,
32B ... Read-out area, 33 ... Cartridge, 35 ...
… Optical block, 37,95 …… Spindle motor, 3
8, 50-57, 61-64, 71-78 ... Optical pickup, 39, 96, 97 ... U-shaped member, 40, 9
8, 99 ... Guide shaft, 43 ... Recording conversion circuit, 44,
80-83 ... Reproduction conversion circuit, 60A, 70A ... inner recording area, 60B, 70B ... outer recording area.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 7/007 9464-5D G11B 7/007 11/10 581 9296-5D 11/10 581D 586 9296-5D 586E 20 / 12 9295-5D 20/12

Claims (12)

[Claims] 1. A disk-shaped recording medium having a recording area divided into a plurality of areas which do not overlap with each other, and the same data is recorded in each of the divided areas, and a disk-shaped recording medium. A reproducing apparatus having a plurality of data reading means arranged in a plurality for each of the areas and having one or a plurality of demodulating means for demodulating each of the data read by the data reading means. A disk device system characterized in that 2. The disk device system according to claim 1, wherein each of the data reading means moves to at least one or more of the plurality of areas. 3. The disk device system according to claim 1, wherein one or a plurality of the reproducing devices are provided corresponding to a plurality of the disk-shaped recording media. 4. The disk device system according to claim 1, wherein at least one disk-shaped recording medium is housed in a cartridge which is detachable from the reproducing device. 5. A disk-shaped recording medium having a recording area divided into a plurality of areas which do not overlap with each other, and different data is recorded a plurality of times in each of the divided areas, and the disk-shaped recording medium. A plurality of data reading means arranged for each of the areas, and one data reading means for each of the plurality of data reading means arranged for each of the areas. And a reproducing apparatus having one or a plurality of demodulating means for demodulating the one series of data after combining the read data so as to form one series of data that is temporally continuous over all the areas. A disk device system that features 6. The disk device system according to claim 5, wherein each of the data reading means moves to at least one or more of the plurality of areas. 7. The disk device system according to claim 5, wherein one or a plurality of the reproducing devices are provided corresponding to a plurality of the disk-shaped recording media. 8. The disk device system according to claim 5, wherein at least one disk-shaped recording medium is housed in a cartridge which is detachable from the reproducing device. 9. A disk-shaped recording medium having a recording area divided into a plurality of areas which do not overlap with each other, and the same data is recorded in each of the divided areas. A disk device, comprising: a plurality of read data read means, and one or a plurality of demodulation means for demodulating the respective data read by the respective data read means. 10. The disk device according to claim 9, wherein each of the data reading means moves to at least one or more of the plurality of areas. 11. A disk-shaped recording medium having a recording area divided into a plurality of areas which do not overlap with each other, and different data being recorded a plurality of times in each of the divided areas. A plurality of the data reading means arranged and a plurality of the data reading means arranged in each of the areas, the data read out by the one data reading means for each of the areas, A disk device, comprising: one or a plurality of demodulation means for demodulating the one series of data after being combined so as to form one series of data continuous in time. 12. The disk device according to claim 11, wherein each of the data reading means moves to at least one or more of the plurality of areas.