JPH0935359A - Magneto-optical recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an error in recording/reproducing by passing through a recording track adjacent to a header area of an adjacent zone with a track jump. SOLUTION: A magneto-optical recorder is provided with an optical head irradiating a luminous flux on a signal recording layer on a magneto-optical disk 9. This time, this optical head ends the write-in of the recording data into a final sector Zn ,m-1 , L of an m-1-th recording track Zn ,m-1 , of one zone Zn . Then, the head track jumps to a second sector Zn+1 ,2 ,2 of the next zone Zn+1 to continue the write-in of the recording data. Respective first sectors Zn+1 ,1 ,1 , Zn+1 ,2 ,1 of the recording tracks Zn+1 ,1 and Z.n+1 ,2 are used for the track jump. In such a manner, the write-in of the recording data is performed continuously without being affected by the rotational latency of the magneto- optical disk 9 ranging between plural zones Zn , Zn+1 ,...Zn .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a magneto-optical recording apparatus for recording an information signal by applying an external magnetic field to a magneto-optical recording medium and irradiating a condensed light beam.

[0002]

2. Description of the Related Art Conventionally, a so-called magneto-optical recording medium having a signal recording layer made of a magnetic material has been proposed. Then, as this magneto-optical recording medium, a magneto-optical disk constituted by having the above-mentioned signal recording layer on a disk-shaped substrate has been proposed.

In this magneto-optical recording medium, a light beam focused on a predetermined area on the signal recording layer is irradiated to heat the area to a temperature higher than the so-called Curie temperature of the material forming the signal recording layer. By applying an external magnetic field, the magnetization direction of the signal recording layer is made to follow the external magnetic field in the cooling process, and the recording data is recorded.

A method of recording the recording data by making the light flux be a constant light output light emission or a pulsed light emission and the external magnetic field being a modulation magnetic field modulated according to the recording data is called a magnetic field modulation method. ing. A method of recording the recording data by using the external magnetic field as a magnetic field of a constant intensity and the light flux as a light flux whose optical output is modulated according to the recording data is called an optical modulation method.

A magneto-optical recording device has been proposed which records and reproduces information signals using the magneto-optical disk as a recording medium.

In this magneto-optical recording apparatus, a rotating operation mechanism for holding and rotating the center portion of the magneto-optical disk and rotating it, an optical head (optical pickup device) for irradiating the magneto-optical recording medium with a light beam, And a magnetic head for applying an external magnetic field to the magneto-optical recording medium.

By the way, in the above-mentioned magneto-optical recording apparatus, it is required to increase the recording density of the recording data on the magneto-optical disk. In order to increase the recording data density, the magneto-optical disk has a narrow track,
That is, the space between adjacent recording tracks (track pitch) is being narrowed.

For example, in the above magneto-optical recording device,
When the wavelength λ of the light flux is 690 nm and the numerical aperture NA of the objective lens of the optical head is 0.55, the track pitch can be 0.9 μm.

Further, in the magneto-optical recording apparatus, CAV () is considered in view of the ease of moving the recording signal reading position on the magneto-optical disk in the radial direction of the magneto-optical disk (so-called seek operation). Con
tinous Angular Velocity)
Rotation, i.e., constant angular velocity rotation, is desirable. On the other hand, in order to increase the density of the recording signal on the magneto-optical disk, it is better to keep the linear density of the recording data constant.

Therefore, there has been proposed a zone system (zone-CA) in which recording and reproduction are performed while keeping the linear density of recorded data constant while performing CAV rotation (zone-CA).
V, M-CAV). In this zone system, as shown in FIG. 1, the signal recording area of the magneto-optical disk has a plurality of (N) zones Z ₁ , Z ₂ , depending on the distance from the center of the magneto-optical disk 9. Z ₃ ... Z _n , Z _{n + 1} , Z
It is divided into _{n + 2} , Z _{n + 3} ... Z _N. That is, each zone Z ₁ , Z ₂ , Z ₃ ... Z _n , Z _{n + 1} , Z _{n + 2} , Z _{n + 3}
... Z _N are arranged in a concentric pattern in the radial direction of the magneto-optical disk 9.

In this zone system, as shown in FIGS.
, Each of the zones Z ₁ , Z ₂ , Z ₃ ... Z _n ,
The recording data recorded on the recording track in Z _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N has an address area (address area) (header (Head).
er)) 23 and data area (data area) 2
4 are composed of a plurality of sectors.

The address area 23 is an area in which a signal is written in advance by pre-pits formed by means such as injection molding when the magneto-optical disk 9 is formed. The data area 24 is an area where the user of the magneto-optical disk 9 writes an information signal by using the magneto-optical recording device.

The zones Z ₁ , Z ₂ , Z ₃ ...
In Z _n , Z _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N , since the linear densities of the recorded data to be recorded are equal to each other, the address area 23 has the same area as shown in FIG. , Is formed at a position transitioned in the circumferential direction of the magneto-optical disk 9 with respect to the address area 23 of the adjacent zone.

[0014]

In the zone type magneto-optical recording apparatus as described above, a signal is previously written in the address area 23 by the prepits. This pre-pit is very large as compared with the magneto-optical data written in the data area 24.

The zones Z ₁ , Z ₂ , Z ₃ ...
In Z _n , Z _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N , the address area 23 transitions in the circumferential direction of the magneto-optical disk 9 with respect to the address areas 23 of the adjacent zones. It is formed at the position.

Therefore, the zones Z ₁ , Z ₂ , Z ₃
· · Z _n, in _{Z n + 1, Z n +} 2, Z n + 3 ··· Z N,
A signal written in the address area 23 of the adjacent zone may leak into the data area 24, and an error may occur when writing / reading the recording data to / from the data area 24.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and adopts CAV (constant angular velocity) rotation and constant linear density of recorded data in a magneto-optical disk by using a zone system. Also, the present invention provides a magneto-optical recording device in which a signal written by a pre-pit in an address area of an adjacent zone is prevented from leaking into a data area and recording and reproduction of recording data in the data area can be favorably performed. The problem is to solve the problem.

[0018]

A magneto-optical recording apparatus according to the present invention is an apparatus for writing recording data on a recording track of a disk-shaped magneto-optical recording medium.

The disc-shaped magneto-optical recording medium has a signal recording region formed on the disc-shaped substrate, and the signal recording region is divided into a plurality of zones according to the distance from the center of the disc-shaped substrate. It is a thing. In each of these zones,
Recording data is recorded on a plurality of recording tracks at a constant linear density, and an address area is provided for each sector of the recording data recorded on the recording tracks.

The magneto-optical recording apparatus according to the present invention has data writing means for writing recording data on the recording track. When writing the recording data to the recording track in the one zone, the data writing means avoids the recording track adjacent to the address area in the other zone adjacent to the one zone, and The recording data is written in the other recording track.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

A magneto-optical recording apparatus according to the present invention is an apparatus for writing recording data on a magneto-optical disk which is a disk-shaped magneto-optical recording medium by adopting a so-called zone system.

The magneto-optical disk is irradiated with a light beam focused on a predetermined area on the signal recording layer to heat the area to a temperature higher than the so-called Curie temperature of the material forming the signal recording layer, and By applying an external magnetic field,
The recording medium is capable of recording data by causing the magnetization direction of the signal recording layer to follow the external magnetic field in the cooling process.

A method of writing the recording data by modulating the intensity of the external magnetic field according to the recording data is called a magnetic field modulation method. The intensity of the light flux is modulated according to the recording data to write the recording data. The method of performing is called an optical modulation method. In the following embodiments, the magnetic field modulation method is used, but the magneto-optical recording apparatus according to the present invention can also use the optical modulation method.

The zone system adopted in this magneto-optical recording apparatus, as shown in FIG. 1, sets the signal recording area of the magneto-optical disk 9 in accordance with the distance from the center of the magneto-optical disk 9. , Multiple zones Z ₁ , Z ₂ , Z ₃
· · · Z _n, is divided into _{Z n + 1, Z n +} 2, Z n + 3 ··· Z N,
Each zone Z ₁ , Z ₂ , Z ₃ ... Z _n , Z _{n + 1} , Z _{n + 2} , Z _{n +
In 3} ... Z _N , recording data having a constant linear density is written. Each of the above zones Z ₁ , Z ₂ , Z ₃ ...
Z _n , Z _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N are arranged concentrically in the radial direction of the magneto-optical disk 9.

Each of the zones Z ₁ , Z ₂ , Z ₃ ... Z _n , Z
_The recording data recorded on the recording track at _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N is as shown in FIG. 1 and FIG.
Address area (address area)
REA) (header) 23 and a data area (data area) 24, and is composed of a plurality of sectors.

The address area 23 has a sector mark (SM) used for sector detection, as shown in FIG.
25, data (VFO1) 26 used for pulling in by a PLL circuit described later, first address mark (AM1) 27 used for address detection, first address (Address)
s1) 28, data (VFO2) 29 used for pulling in by the PLL circuit, second address mark (AM2) 30 used for address detection, and second address (Ad
It is composed of the dress 2) 31.

The address area 23 is an area in which a signal is written in advance by means of pre-pits formed by means such as injection molding when the magneto-optical disk 9 is produced. The data area 24 is an area where the user of the magneto-optical disk 9 writes an information signal by using the magneto-optical recording device.

Each zone Z ₁ , Z ₂ , Z ₃ ... Z _n , Z
_{In n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N , since the linear densities of the recording data to be recorded are equal to each other, the address area 23 is formed in the adjacent zones as shown in FIG. It is formed at a position transitioned in the circumferential direction of the magneto-optical disk 9 with respect to the address area 23.

Each of the zones Z ₁ , Z ₂ , Z ₃ ... Z _n , Z
Each of _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N has m recording tracks formed therein. In the following description, zone Z
_{The n-} th m-th recording track will be referred to as a recording track Z _{n, m} . Similarly, the s-th sector of the m-th recording track in the zone Z _n is designated as sector Z _{n, m, s} . These recording tracks are formed between the groove formed on the magneto-optical disk 9 and the groove. The groove serves as a thermal barrier for adjacent recording tracks.

In this embodiment, the recording data recorded on the magneto-optical disk by the magneto-optical recording device is the non-inverted section length limiting code, so-called RLL.
(Run Length Limited) code, for example, EFM (Eight to Four).
NRZ, like the een Modulation code
I (Non Return to Zero Inve
This is data in which the minimum reversal interval (shortest mark length) and the maximum reversal interval (longest mark length) are restricted because the upper and lower limits of the number of consecutive "0" are restricted. In the magneto-optical recording apparatus according to the present invention, the recording data recorded on the magneto-optical disk does not have to be the non-inverted section length limiting code.

As shown in FIG. 2, this magneto-optical recording apparatus has a rotary operation mechanism 7 for rotating the magneto-optical disk 9 while holding the central portion of the magneto-optical disk 9. The magneto-optical recording apparatus has an optical block unit (Optical Block) 1 serving as a data writing unit.

The optical block section 1 has a magnetic head 8 for applying a magnetic field to the signal recording layer of the magneto-optical disk 9 which is rotated by the rotation operation mechanism 7.

The magnetic head 8 is controlled by a magnetic head driver (Mag driver) 6 to generate a magnetic field. This magnetic field generating means is a magnetic field (Magnetic F) modulated according to the non-inverted section length limiting code when writing the recording data to the magneto-optical disk 9.
field) is applied to the signal recording layer of the magneto-optical disk 9.

The optical block unit 1 also has an optical head 2 for irradiating the light beam focused on the signal recording layer of the magneto-optical disk 9 which is rotationally operated by the rotational operation mechanism 7. The optical head 2 has a laser diode as a light source and a condenser lens.

The emission wavelength λ of the laser diode is 690 nm, for example. The numerical aperture NA of the objective lens of the condenser lens is, for example, 0.55. In this case, the diameter of the beam spot formed by condensing the light flux in the optical head 2 is λ / NA = 0.69 (μ
From m) /0.55≈1.2 μm, it becomes about 1.2 μm.

The optical head 2 controls the light emission of the laser diode by a laser driver (LD driver) 4. The optical head 2 irradiates a region of the signal recording layer of the magneto-optical disk 9 to which the external magnetic field is applied with the light flux emitted by the laser diode after being condensed by the condenser lens. At the time of writing the recording data to the magneto-optical disk 9, the area on the signal recording layer irradiated with the light beam condensed by the condenser lens is higher than the so-called Curie temperature of the material forming the signal recording layer. Be heated.

The optical head 2 also has a photodetector for receiving the light flux reflected by the signal recording layer of the magneto-optical disk 9 of the light flux applied to the magneto-optical disk 9.
This photodetector sends a photodetection current to an IV (current-voltage) converter 3.

The optical head 2 is driven by a biaxial actuator slider (2 axis Slide) 5.
Biaxial directions of an optical axis direction (focusing direction) of the condenser lens and a direction (tracking direction) orthogonal to the optical axis and a recording track on the magneto-optical disk 9, and further,
The movement of the magneto-optical disk 9 is controlled in the radial direction.

The pre-pit signal (PRF) output from the IV converter 3, that is, the address area 2
The signal read by the gain controller (G.
C. ) 10 through a waveform shaper (Pulse det)
Waveform shaping is performed at 11. The waveform-shaped pre-pit signal (PRF) is a PLL (Phase Lock).
ed Loop) circuit 12, VCO (voltage controlled oscillator)
13 and an R / W (modulation (encoding) demodulation (decoding)) circuit 17.

The above PLL circuit 12 and VCO circuit 13
Performs clock reproduction based on the pre-pit signal (PRF) and sends it to the control circuit (CPU) 14. R / above
The W circuit 17 performs address reproduction based on the prepit signal (PRF) and sends it to the control circuit 14.

The magneto-optical read signal (MO) output from the IV converter 3 is passed through a gain controller (GC) 15 and then a waveform shaper (Pulse d).
et) 16, and the waveform is shaped. The waveform-shaped magneto-optical read signal is sent to the R / W circuit 17. The R / W circuit 17 decodes the magneto-optical read signal and transfers it to the control circuit 14.

The R / W circuit 17 encodes the data transferred by the control circuit 14, and based on this data, a PPD (Programmable Ph).
control circuit 18 is controlled. This PPD
The circuit 18 includes the R / W circuit 17 and the control circuit 14.
Under the control of the magnetic head driver 6 and the laser driver 4 to write the recording data on the magneto-optical disk 9, the magnetic field generated by the magnetic head 8 and the laser diode of the optical head 2 emits light. Control the phase.

Further, the fapc signal output from the IV converter 3 is ALPC (laser output control (Aut).
o Laser Power Control
r)) is sent to the circuit 19. This ALPC circuit 19 is
Based on the fapc signal and the control by the control circuit 14, the light emission output of the laser diode corresponds to writing of recording data to the magneto-optical disk 9 or reading of recording data from the magneto-optical disk 9. Control to output.

Then, a focus error signal (focus error) output from the IV converter 3,
The pull-in signal (pull in) and the tracking error signal (trk error) are transmitted to the servo (Serv).
o) sent to the circuit 20. The servo circuit 20 controls the biaxial actuator slider 5 based on the error signals and the control of the control circuit 14 so that the light beam is focused by the optical head 2 on a predetermined recording track. To

The control circuit 14 is connected to the controller 21 and SCSI (Small) via the controller 21.
Computer System Interfac
e) Host (HOS) connected via bus (BUS)
T) Data transfer is performed with the circuit 22. The host circuit 22 receives an input signal from an operation unit (not shown), supplies a signal for instructing writing or reading of recording data to the control circuit 14 via the controller 21, and also to the magneto-optical disk 9. The recording data to be written is supplied. The controller 21 also encodes and decodes an error correction code (ECC).

In the magneto-optical recording apparatus configured as described above, when the host circuit 22 gives an instruction to write the recording data to the magneto-optical disk 9, the controller 21 writes the recording data. The servo circuit 20 is controlled by designating the sector for performing the error correction, the error correction code is encoded with respect to the recorded data, and the encoded error correction code is transferred to the R / W circuit 17. Under the control of the controller 21, the servo circuit 20 moves the magnetic head 8 and the optical head 2 to a position corresponding to a designated sector.

In this magneto-optical recording device,
The R / W circuit 17 modulates the recording data into the non-inverted section length limiting code (RLL code). In addition, the above R
The / W circuit 17 is synchronized with the system clock and
The D circuit 18 is controlled to control the magnetic field generated by the magnetic head 8 and the phase of the light flux emitted by the laser diode, and the write data is written to the magneto-optical disk 9 by the magnetic field and the light flux.

In this magneto-optical recording apparatus, when the linear density of the recording data on the magneto-optical disk 9 is 0.4 (μm / bit), the 1-channel bit length of the recording data is 0. 2 (μm / channel bit length). Since the beam spot diameter by the optical head 2 was about 1.2 μm, one channel bit length corresponds to about 1/6 of the beam spot diameter.

The laser diode is the PP
Controlled by the D circuit 18, pulse light emission is performed once per 2 channel bits or 3 channel bits. In this laser diode, the recording clock is 50 MHz, the pulse width of light emission is, for example, 10 nsec,
The peak light output is about 15 mW. The pulsed light emission of the laser diode is emitted when the magnetic field generated by the magnetic head 8 has a sufficiently strong magnetic field upward or downward from the recording saturation magnetic field.

On the recording track of the magneto-optical disk 9, after the pulse emission of the laser diode, marks are formed in the mark forming period which is the cooling process of the signal recording layer. This mark is formed on the recording track. The mark formed on the groove does not affect the read signal when reading the recorded data. In addition, since the channel bit length is shorter than the beam spot diameter on the recording track, a clean mark having a large radius of curvature of the edge of the mark is formed.

In this magneto-optical recording device,
As shown in FIGS. 3 and 4, the optical block unit 1 includes
When the recording data is written to the first recording track Z _{n, 1 to} the m- _th recording track Z _{n, m} which are the recording tracks in any one zone Z _n , it is adjacent to this one zone Z _n . Avoiding the first and m- _th recording tracks Z _{n, 1} , Z _{n, m} adjacent to the address area 23 in the other zones Z _n-1 , Z _{n + 1} , other zones in the one zone Z _n are avoided. Of the second recording track, that is, the second recording track Z _{n, 2 to the} (m−1) th recording track Z _{n, (m−1)} .

In this magneto-optical recording apparatus, as for the first zone Z _1, there is no zone adjacent to the first recording track Z _1,1 side.
_The recording data is written over the _{1,1 to} (m-1) th recording track Z _{1, (m-1)} . Similarly, as for the final zone Z _{N, since} there is no adjacent zone on _{the m-th} recording track Z _{N, m} side, the second recording track Z _{N, 2 to} the m-th recording track Z _{N, The} recording data is written over _m .

Further, in this magneto-optical recording device,
The writing of the recording data in each zone Z _n except the first zone Z ₁ is started with the second sector Z _n, 2,2 of the second recording track Z _{n , 2} as a start sector.

That is, as shown in FIG. 3, the optical head 2 has the last sector Z _{n, (m-} of the (m-1) th recording track Z _{n, (m-1)} in one zone Z _{n. 1), When} the writing of the recording data to _L is completed, the track jumps to the second sector Z _{n + 1,2,2} of the second recording track Z _{n + 1,2} of the next zone Z _{n + 1} . Then, the writing of the record data is continued. Each of the first sectors Z _{n + 1,1,1} and Z _{n + 1,2} of the first recording track Z _{n + 1,1} and the second recording track Z _{n + 1,2} of this zone Z _{n + 1} . _{, 1}
Is used for track jumps. In this way, a plurality of zones Z ₁ , Z ₂ , Z ₃ ... Z _n , Z _{n + 1} ,
The magneto-optical disk 9 extends between Z _{n + 2} , Z _{n + 3} ... Z _N.
It is possible to write the recorded data continuously without being affected by the latency of rotation of the.

In this magneto-optical recording apparatus, when the host circuit 22 gives an instruction to read the recording data from the magneto-optical disk 9, the controller 21 selects a sector for reading the recording data. The servo circuit 20 is designated and controlled. The servo circuit 2
Under the control of the controller 21, 0 operates to move the magnetic head 8 and the optical head 2 to a position corresponding to the designated sector.

Then, the R / W circuit 17 binarizes the data read from the magneto-optical disk 9 and transfers it to the controller 21. The controller 21
Decodes the error correction code for the read recording data and transfers it to the host circuit 22.

[0058] In this magneto-optical recording device, as shown in FIGS. 3 and 4, the optical block 1, when reading the recorded data from any one zone Z _n, this one zone Z _n Of the first and mth recording tracks Z _{n, 1} and Z _{n, m} adjacent to the address area 23 in the other zones Z _n-1 and Z _{n + 1} adjacent to the first zone Z _n. The recording data is read from the other recording track, that is, the second recording track Z _{n, 2 to the} (m−1) th recording track Z _{n, (m−1)} .

In this magneto-optical recording apparatus, as for the first zone Z _1, there is no zone adjacent to the first recording track Z _1,1 side.
_The recording data is read over the _{1,1 to} (m-1) th recording track Z _{1, (m-1)} . Similarly, as for the final zone Z _{N, since} there is no adjacent zone on _{the m-th} recording track Z _{N, m} side, the second recording track Z _{N, 2 to} the m-th recording track Z _{N, The} recorded data is read over _m .

Further, in this magneto-optical recording device,
First zone Z₁Each zone except Z_nRecorded data in
Reading the second recording track Z_{n, 2}Second sector of
Z_{n, 2 , 2}Will be started as a start sector
I have.

That is, as shown in FIG. 3, the optical head 2 has the last sector Z _{n, (m-} of the (m-1) th recording track Z _{n, (m-1)} in one zone Z _{n. 1), When} the reading of the recording data from _L is completed, the track jumps to the second sector Z _{n + 1,2,2} of the second recording track Z _{n + 1,2} of the next zone Z _{n + 1} . To continue reading the recorded data. The first recording tracks Z _{n + 1,1} of the zone Z _{n + 1} and the first sectors Z _{n + 1,1,1} and Z of the second recording tracks Z _{n + 1,2.
n + 1,2,1} are used for track jumps. In this way, a plurality of zones Z ₁ , Z ₂ , Z ₃ ... Z _n ,
It is possible to continuously read the recorded data over the areas Z _{n + 1} , Z _{n + 2} , Z _{n + 3} ... Z _N without being affected by the rotation latency of the magneto-optical disk 9.

[0062]

As described above, the data writing means of the magneto-optical recording apparatus according to the present invention, when writing the recording data to the recording track within one zone of the disk-shaped magneto-optical recording medium, The recording data is written to the other recording track in the one zone while avoiding the recording track adjacent to the address area in the other zone adjacent to the zone.

That is, according to the present invention, while the CAV (constant angular velocity) rotation and the constant linear density of the recording data are adopted in the magneto-optical disk by using the zone system, the data is written by the pre-pit in the address area of the adjacent zone. It is possible to provide a magneto-optical recording device which prevents a signal from leaking into a data area and enables good recording and reproduction of recording data in the data area.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing the configuration of a magneto-optical recording medium in which an information signal is recorded in a magneto-optical recording device according to the present invention.

FIG. 2 is a plan view schematically showing a structure of a sector in the magneto-optical recording medium.

FIG. 3 is a plan view schematically showing a recording operation of an information signal on the magneto-optical recording medium in the magneto-optical recording device.

FIG. 4 is a plan view schematically showing the structure of a recording track in the magneto-optical recording medium.

FIG. 5 is a block diagram showing a configuration of the magneto-optical recording device.

[Explanation of reference numerals] 2 optical head 4 laser driver (LD driver) 6 magnetic head driver (Mag driver) 8 magnetic head 9 magneto-optical disk 17 R / W circuit 23 address area Z ₁ , Z ₂ , Z ₃ ... Z _n , Z _{n + 1} , Z _{n + 2} , Z _{n + 3} ...
Z _N zone

Claims (1)

[Claims] 1. A signal recording area formed on a disk-shaped substrate, the signal recording area being divided into a plurality of zones according to the distance from the center of the disk-shaped substrate, and a plurality of recording tracks in each zone. Data writing for writing recording data on the recording track of a disk-shaped magneto-optical recording medium on which recording data is recorded at a constant linear density and an address area is provided for each sector of the recording data recorded on the recording track When the recording data is written in the recording track in one zone, the data writing means avoids a recording track adjacent to an address area in another zone adjacent to this one zone, A magneto-optical recording device configured to write the recording data to another recording track in the one zone.