JP2001057029A - Data recording and reproducing device and data recording and reproducing method, recording medium and formating method for the recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an efficient prepit format for an MSR magneto-optical disk and to reduce the number of PLL circuits in a disk player and to improve a transient characteristic. SOLUTION: In recording media including a prepit recording area and an MO recording area, data modulation systems are selected so that a recording and a reproducing are possible by using channel bit clocks having the same frequency and also the recording density in the MO area is higher than that in the prepit area. The recording density in the MO area becomes higher than that in the prepit area by making the MO area to be the area of a super-high resolution system. For example, the recording and the reproducing can be performed in both areas with channel bit clocks having the same frequency by respectively adopting an EFM pulse modulation system with respect to the prepit area and a (1, 7) RLL modulation system with respect to the MO area. Since the recording and the reproducing can be performed only by changing over data without needing it to change over PLL circuits between the areas and, thus, a load in the cost is small. Moreover, since it is not needed to lower the recording density in the prepit area to the half that in the MO area, an efficient prepit format is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk drive of the type which records and / or reproduces data by irradiating a reproducing beam onto a magneto-optical disk surface on which data is recorded and detecting reflected light. In particular, data is recorded and / or recorded on a "magnetic super-resolution (MSR) disk medium" which realizes data reproduction beyond the optical limit resolution determined by the wavelength of the reproduction beam light and the numerical aperture NA of the objective lens. Also, the present invention relates to a magneto-optical disk drive of a type capable of reproducing.

More specifically, the present invention relates to a pre-pit region in which a signal mark is formed by pits and recording / reproducing is performed based on the intensity of reflected light from a pit of a reproducing beam, and a signal mark is formed and reproduced by a difference in magnetization direction. The present invention relates to a magneto-optical disk drive that performs data recording and / or reproduction on a magnetic super-resolution disk of a type in which an MO area for recording and reproduction coexists using the polarization action generated in reflected light of a beam.

[0003]

2. Description of the Related Art Various information processing systems including a general-purpose computer are equipped with an external storage device for storing large-scale applications and large-capacity data in a nonvolatile manner. There are various types of external storage devices, such as a disk type that holds data on a rotary disk and a tape type that holds data on a rewound tape. Among them, the disk type external storage device is excellent in that it can be randomly accessed.

[0004] One example of the external storage device is a hard disk device (HDD), and the other examples are an optical disk device and a floppy (registered trademark) disk device (FDD). The former HDD is a storage device of a type in which a magnetic disk as a recording medium is integrally mounted in a disk drive. Due to advances in magnetic head technology, signal processing technology, and the like, HDD capacity has been remarkably increased (for example, 1
From around 990 to the present, the areal recording density has been increasing at an annual rate of about 60%.) Further, since high-speed data transfer is possible, the HDD is mainly used for storing a system installation program such as an OS and an application, and for local storage of a document file and the like.

On the other hand, the latter optical disk device and FD
D is portable because the optical disk or FD as a medium can be freely attached to and detached from a recording / reproducing apparatus. For this reason, this type of external storage device is used for storing and moving large amounts of data. In particular, since an optical disk has a large storage capacity, a large amount of data such as AV (Audio Visual) data can be collectively managed on a single disk, and can be shared by a plurality of users.

Conventionally, the resolution of an optical disc is limited by an optical cut-off determined by the wavelength of a laser beam used as a reproduction beam and its irradiation optical system (more specifically, the numerical aperture NA of an objective lens). It was supposed to be. This is based on the mechanism that when two or more information signal marks exist in one reproduction beam spot, the reproduction signals of the marks interfere with each other, so that 0 or 1 cannot be determined. To further increase the resolution,
Although it is necessary to shorten the laser wavelength of the reproducing optical system and increase the numerical aperture NA of the objective lens, there are problems such as waveform interference caused by an optical diffraction limit.

However, recently, a magnetic super-resolution (Magnetic Su
Research and development on "per Resolution (MSR)" type disk media has been active, and various reports and proposals have been made.

[0008] The MSR type disk has a reproducing layer and a recording layer, and is configured to read data written in the recording layer by a magneto-optical effect while changing the magnetization state of the reproducing layer. Is used.
For example, FAD (FrontAperture Det)
section), RAD (Rear Aperture)
Detection) and CAD (Center)
Aperture Detection).

Data reproduction from these MSR disks is realized by utilizing the temperature distribution on the disk surface within the reproduction beam spot. For example, in FAD, a signal is detected by reading out phase pits in a low-temperature area of a low-temperature area (crystal state) and a high-temperature area (liquid phase) existing in the beam spot. A signal is detected by reading out the phase pits in the area.

[0010] The CAD utilizes the fact that the irradiation with the reproducing beam spot causes the region where the temperature exceeds a predetermined threshold temperature to be in a perpendicular magnetization state and a center aperture is formed. That is, the reproducing layer and the recording layer are magnetostatically coupled, and only the magnetization direction of the reproducing layer in the center aperture determined by the state of the leakage magnetic field generated from the recording layer is detected, thereby realizing super-resolution reproduction. It is.

The recording area of a medium such as a magneto-optical disk includes a recording area on the disk, that is, an address recording area for storing address information, in addition to a user recording area used for recording a program or data designated by a user. And

In the former user recording area, data is recorded and reproduced using a magneto-optical effect. That is, a signal mark is formed due to the difference in the magnetization direction, and the polarization effect generated in the reflected light of the reproduction beam is used (hereinafter, the user recording area is also referred to as “MO area”). On the other hand, in the latter address recording area, signal marks are formed by embossed pre-pits,
Data is reproduced by the light reflection action, that is, the intensity of the reflected light according to the unevenness formed by the pits (hereinafter, the address recording area is also referred to as “pre-pit area”).

Conventionally, in both the address recording area and the user recording area, the reproduction beam spot as the optical limit is the resolution limit, and the recording densities of both are the same.

However, in the case of the magneto-optical disk of the MSR system, a gap occurs in the recording density between the user recording area and the address recording area. User recording area is RAD
(Rear Aperture Detection)
And CAD (Center Aperture Dete
c.), it is possible to perform recording and reproduction beyond the recording density determined by the optical limit size of the reproduction beam spot (described above). On the other hand, in the address recording area, the recording data is expressed by the concave and convex shapes formed by the pits. Therefore, the resolution is limited by the size of the reproducing beam spot, and the recording density remains low.

The operation of the pickup section of the disk drive for reading the reflected light of the reproduction beam from the magneto-optical disk is as follows.
Synchronization is achieved by a predetermined frequency provided by a clock signal called a "channel bit clock". As described above, when the recording densities of the address recording area and the user recording area are different, the cycle of the reading operation in each area, that is, the frequency of the channel bit clock may be changed.

The predetermined frequency of the clock signal is usually PL
By L (Phase Lock Loop) circuit,
It is obtained by multiplying the frequency of the initial oscillation clock. If the recording density of the address recording area is reduced to an integral multiple of the recording density of the user recording area, there is no need to switch the PLL circuit, which is convenient.

However, in this case, the recording density of the address recording area must be reduced to at most half the recording density of the user recording area, and the efficiency of data recording / reproducing as a whole of the disk medium is reduced. not good.

As an alternative technique, it is conceivable to increase the data recording / reproducing efficiency of the address recording area by setting the ratio of the recording densities of the address recording area and the user recording area to a simple integer ratio.

However, according to this alternative technique,
In the recovery of the clock at the time of data reproduction, the PLL internal circuit (for example, VC
It is necessary to switch O (voltage control oscillation circuit), N value, or the loop itself. Therefore, not only does the apparatus cost increase, but there remains a problem in the characteristics such as the timing switching circuit and the transitional pull-in of the timing PLL. Remains.

[0020]

SUMMARY OF THE INVENTION An object of the present invention is to take into consideration the technical problems as described above. A signal mark is formed by pits, and recording / reproducing is performed by the intensity of reflected light of the reproducing beam from the pits. And a MO super-resolution disc in which a signal mark is formed due to a difference in magnetization direction and an MO area in which recording and reproduction are performed by utilizing a polarization effect generated in reflected light of a reproduction beam. An object of the present invention is to provide an excellent data recording and / or reproducing apparatus and a data recording and / or reproducing method capable of realizing a suitable data recording and / or reproducing operation.

A further object of the present invention is to improve the data recording efficiency of the entire disk without increasing the apparatus cost for a magneto-optical disk of the type in which the pre-pit area and the MO area coexist. An object of the present invention is to provide an excellent data recording and / or reproducing apparatus and a data recording and / or reproducing method.

A further object of the present invention is to provide a magneto-optical disk of a type in which a pre-pit area and an MO area coexist without reducing the recording density of the pre-pit area more than necessary without increasing the apparatus cost. An object of the present invention is to provide an excellent data recording and / or reproducing apparatus and a data recording and / or reproducing method.

[0023]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and a first aspect of the present invention is a first aspect in which data is recorded at a first recording density.
A data recording / reproducing apparatus or method for recording and / or reproducing data on / from a recording medium including a recording area for recording data and a second recording area for recording data at a second recording density, In order to record and / or reproduce data in both the first and second recording areas using a channel bit clock of a frequency,
A data recording / reproducing apparatus or method, wherein a second recording density lower than the first recording density is selected.

According to a second aspect of the present invention, a first recording area in which data is recorded according to a first modulation scheme and a second recording area in which data is recorded according to a second modulation scheme. Record data on the recording media containing the
Or a data recording / reproducing apparatus or method for reproducing,
Data can be recorded and / or reproduced from both the first and second recording areas by using a channel bit clock of the same frequency, and the recording density in the second recording area is higher than the recording density in the first recording area. A data recording / reproducing apparatus or method, wherein each of the first and second modulation methods is selected so that the recording density in the recording area is higher.

According to a third aspect of the present invention, a first recording area in which data is recorded according to a first modulation scheme and a second recording area in which data is recorded according to a second modulation scheme. Record data on the recording media containing the
Or a data recording / reproducing apparatus or method for reproducing,
Data can be recorded and / or reproduced in both the first and second recording areas by using a channel bit clock of the same frequency, and a minimum signal inversion section of a signal mark in the first recording area Wherein each of the first and second modulation schemes is selected so that the first modulation scheme is larger than the minimum signal inversion section of the signal mark in the second recording area. is there.

According to a fourth aspect of the present invention, a first recording area in which data is recorded at a first recording density and a second recording area in which data is recorded at a second recording density. A recording medium including the first recording medium so that data can be recorded and / or reproduced from both the first and second recording areas using a channel bit clock having the same frequency. Second lower than density
The recording medium is characterized in that the recording density is selected.

According to a fifth aspect of the present invention, a first recording area in which data is recorded by a first modulation scheme and a second recording area in which data is recorded by a second modulation scheme. A recording medium including the first recording area, wherein data can be recorded and / or reproduced from both the first and second recording areas using a channel bit clock having the same frequency. Recording media wherein each of the first and second modulation methods is selected such that the recording density in the second recording area is higher than the recording density in.

According to a sixth aspect of the present invention, a first recording area in which data is recorded according to a first modulation scheme and a second recording area in which data is recorded according to a second modulation scheme. A recording medium including the first recording area, wherein data can be recorded and / or reproduced from both the first and second recording areas using a channel bit clock having the same frequency. That the first and second modulation schemes are selected such that the minimum signal inversion section of the signal mark in the second recording area is larger than the minimum signal inversion section of the signal mark in the second recording area. This is a recording medium that is characterized.

According to a seventh aspect of the present invention, there is provided a format method for a recording medium including first and second recording areas having different recording densities. EFM (Eight to Fourtee
nModulation) plus method or (2,
7) RLL (Run Length Limited)
In addition to applying the method, a (1, 7) RLL (Run Length Limit) is applied to the second recording area.
ed) A recording medium characterized in that a recording and / or reproducing operation using a channel bit clock of the same frequency is enabled for the first and second recording areas by applying the method. Format method.

According to an eighth aspect of the present invention, there is provided a method for formatting a recording medium including first and second recording areas having different recording densities. A method of modulating an 8-bit code into a 16-bit code is applied, and a method of modulating a 2-bit code into a 3-bit code is applied to the second recording area. This is a format method for a recording medium, wherein a recording and / or reproducing operation using a channel bit clock of the same frequency is enabled for two recording areas.

For example, the first recording area is a pre-pit area for recording / reproducing data by an optical effect.
Also, the second recording area is an MO (Magneto Optical) for performing data recording / reproduction by a magneto-optical effect.
al) area. Also, the MO area is a RAD (Rea)
r Aperture Detection) and CAD
(Center Aperture Detection
n) and other magnetic super-resolution (MSR: Magnetic S)
An upper resolution method can be adopted, and in such a case, the second recording area can be configured to have a higher recording density than the first recording area.

For example, EFM is used as the first modulation method.
(Eight to Fourteen Modula
) plus method or (2, 7) RLL (Ru
nLength Limited) system and (1,7) RLL (Ru) as the second modulation system.
By employing the (n Length Limited) method, data can be reproduced from both the first and second recording areas having different recording densities by using the channel clock of the same frequency. EFM (Ei
ght to Fourteen Modulatio
n) The plus modulation method is a method of modulating an 8-bit code into a 16-bit code, and (1,7) R
The LL (Run Length Limited) modulation method is a method of modulating a 2-bit code into a 3-bit code. When each of the above modulation methods is adopted, the first
Minimum signal inversion section (=
3) is larger than the minimum signal inversion section (= 2) of the signal mark in the second recording area.

The notation (d, k) RLL means the RLL system in which the minimum run is d and the maximum run is k. In this case, the minimum signal inversion section is d + 1, and the maximum signal inversion section is k + 1. Become.

According to each aspect of the present invention, a data recording and / or reproducing operation is performed by applying a channel bit clock of the same frequency to the first and second recording areas having different recording densities. It can be carried out.

As described above, the first recording area is, for example, a pre-pit area in which a signal mark is expressed by pit unevenness, and the second recording area is an MO in which the signal mark is expressed by a change in the amount of reflected light due to magnetization. (Magnet
o Optical) region. By employing the magnetic super-resolution method for the MO region, the recording density can be improved beyond the optical limit. However, even in this case, even if the recording density of the pre-pit area as the first recording area is not reduced to half of that of the MO area, both recordings are performed using the same frequency channel bit clock. Data recording and / or reproduction can be performed on the area.

The fact that the channel bit clock is the same means that the recording and / or reproducing operation for both the pre-pit area and the MO area is realized only by switching the data and without switching the PLL circuit. Means you can do it.

Therefore, according to the present invention, the number of PLL circuits can be reduced, the transient characteristics can be improved, and an efficient preformat of a magneto-optical disk can be realized.

Still other objects, features and advantages of the present invention are:
It will become apparent from the following more detailed description based on the embodiments of the present invention and the accompanying drawings.

[0039]

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

FIG. 1 schematically shows the hardware configuration of a magneto-optical disk recording / reproducing apparatus 1 used in the embodiment of the present invention. This playback device 1 is a RAD (Rear
Aperture Detection) and CAD
(Center Aperture Detection
n) and other magnetic super-resolution (MSR: Magnetic S)
Recording on a magneto-optical disk of the upper resolution type (that is, writing of information signal marks)
Operation and a reproduction (that is, reading of an information signal mark) operation. This type of recording / reproducing apparatus 1 is, for example, a SCSI (Small Computer).
A general-purpose computer or the like (workstation or personal computer: hereinafter, according to a standard interface such as a System Interface)
Externally connected to a “host”). Hereinafter, each unit will be described with reference to FIG.

This magneto-optical disk recording / reproducing apparatus 1 comprises:
While rotating the magneto-optical disk 100 as a storage medium along the disk circumferential direction by the spin motor 11,
By scanning the pickup unit 12 in the radial direction of the disc, a predetermined position on the surface of the disc 100 is accessed to perform data recording and / or reproducing operation.

The magneto-optical disk 100 has a configuration including a recording space on the disk, that is, an address recording area for storing address information, in addition to a user recording area used for recording a program or data designated by a user. Has become.

In the former user recording area, data is recorded and reproduced by utilizing the magneto-optical effect. That is, a signal mark is formed due to the difference in the magnetization direction, and the polarization effect generated in the reflected light of the reproduction beam is used (hereinafter, the user recording area is also referred to as “MO area”). On the other hand, in the latter address recording area, signal marks are formed by embossed pre-pits,
Data is reproduced by the light reflection action, that is, the intensity of the reflected light according to the unevenness formed by the pits (hereinafter, the address recording area is also referred to as “pre-pit area”).

In the pre-pit area, the recording data is expressed by the unevenness formed by the pits. Therefore, the resolution is limited by the optical limit, and the recording density remains low.
On the other hand, the MO area is a RAD (Rear Aper
Cure Detection and CAD (Cente
By employing a magnetic super-resolution method such as r Aperture Detection, recording / reproduction can be performed beyond the recording density determined by the optical limit size of the reproduction beam spot (described above). That is, the recording density differs on the disc 100 as a recording medium.
It should be appreciated that two recording areas coexist.

The pickup unit 12 is, for example, a laser
Light source of recording / reproducing beam such as diode (LD), optical components such as collimator lens, objective lens, deflection beam splitter, cylindrical lens, and four-segment photodetector (all not shown in FIG. 1) It consists of.

The laser power control circuit 21 controls the driving of the LD drive circuit 22 in accordance with an instruction from the control unit 20. The LD drive circuit 21 includes the pickup unit 1
A drive current is supplied to the second laser diode to realize a reproducing and / or recording operation on the surface of the disk 100.

The pickup section 12 is mounted on a support (not shown), and the support is driven by a thread motor (not shown) or the like to position the disk 100 in the radial direction. The servo circuit 15 outputs a servo signal to the thread motor and the spin motor 11 to synchronously control the relative radial and diametric displacement of the pickup unit 12 with respect to the surface of the disk 100, Positioning, that is, access to a predetermined address on the disk 100 is realized.

When data is reproduced from the disk 100 in the disk recording / reproducing apparatus 1, each control signal from the servo circuit 15 controls the pickup unit 12.
Accesses a specified physical address on the disk 100, irradiates a reproduction beam, and detects reflected light from the disk 100. To be more specific, a four-segment photo
The detector receives the reflected light, performs photoelectric conversion, and supplies a voltage signal corresponding to the intensity of the reflected light to the RF circuit 14.

The RF circuit 14 reproduces an RF signal based on a signal output from the detection signal operation circuit 13 and corresponding to reflected light.
A signal, a tracking error signal, and a focus error signal are generated.

The tracking error signal and the focus
The error signal is supplied to the servo circuit 15. The servo circuit 15 generates a tracking servo signal and a focus servo signal based on these error signals,
These are supplied to the pickup unit 12. The pickup unit 12 performs feedback control in accordance with these servo signals so that an accurate position on a track is irradiated with a reproduction beam with a good spot diameter.

The reproduced RF signal generated by the RF circuit 14 is supplied to each of the data demodulation circuit 16, the address demodulation circuit 18, and the laser power control circuit 21.

The data demodulation circuit 16 digitally demodulates the reproduced RF signal by a predetermined demodulation method according to whether the signal is in the pre-pit area or the MO area, and the subsequent ECC demodulation circuit 17 performs the ECC (Error) addition to the data. C
After performing an error correction according to an orientation code (error correction code), the reproduction digital data is supplied to the host interface 30.

The host interface 30 is interconnected with an external device positioned as a “host” according to a predetermined interface protocol. The host interface 30 includes an input / output register for holding reproduction data and / or recording data, a host command, and a state in the recording / reproduction device 1.

The address demodulation circuit 16 is provided for reproducing RF signals.
The address portion in the signal is digitally demodulated, error-corrected by ECC, and then supplied to the control unit 20 as an address.

The laser power control circuit 21 generates a reproduction power error signal based on the reproduction RF signal, and the pickup unit 12 irradiates an optimum reproduction beam to maintain the reproduction power at an appropriate value. LD drive circuit 2
2 is controlled. The details of the laser power control circuit 21 are described in Japanese Patent Application No. Hei.
No. 185,242.

The control section 20 is a control circuit for controlling the overall operation of the magneto-optical disk reproducing apparatus 1 as a whole, and a ROM (Read) which permanently stores micro codes and predetermined data defining processing operations. Only
Memory) and a RAM (Random Access Memory) for temporarily storing work data.
y) (not shown). Control unit 20
Can interpret the host command received via the host interface 30 and control the operation inside the disc recording / reproducing apparatus 1. For example, in response to the reception of a reproduction command or a recording command for the disk 100, a command is issued to the servo circuit 15 or the laser power control circuit 21 to execute a reproducing operation or a recording operation.

ECC addition circuit 25, data modulation circuit 2
6 and a magnet drive circuit 27 are channels for data recording. The ECC adding circuit 25 adds an EC to the write data received via the host interface 30.
C is added. Further, the data modulation circuit 26 digitally modulates the write data to which the ECC has been added according to a predetermined modulation method depending on whether the data is a pre-pit area or an MO area. The magnet driving circuit 27 drives the external magnetic field generating coil 28 according to the modulation data,
Generate a magnetic field corresponding to the data stream.

The data recording and reproducing operations in the disk recording / reproducing apparatus 1 are synchronized by a channel bit clock having a predetermined frequency. The channel bit clock is supplied by multiplying an oscillation frequency generated by an oscillator (not shown) in a PLL circuit (not shown).

In the present embodiment, EFM (Eight to Right) is used as a data modulation / demodulation method for the pre-pit area.
Fourteen Modulation) plus
System or (2,7) RLL (Run Length L
(1,7) RLL (Run) as a data modulation / demodulation method for the MO area.
(Length Limited) method.

EFM (Eight to Fourte)
en Modulation) plus modulation method is 8
This is a method of modulating a bit code into a 16-bit code, and a (1, 7) RLL (Run Length).
The (Limited) modulation method is a method of modulating a 2-bit code into a 3-bit code. In this case, the minimum signal inversion section of the signal mark in the pre-pit area (=
3) is larger than the minimum signal inversion section (= 2) of the signal mark in the MO area. (However, (d, k)
The notation RLL means the RLL system in which the minimum run is d and the maximum run is k. In this case, the minimum signal inversion section is d + 1 and the maximum signal inversion section is k + 1. )

By the combination of the modulation methods, both the pre-pit area and the MO area having different recording densities are
It should be understood that data recovery can be performed using the same frequency channel bit clock.

FIG. 2 shows a disk 100 according to this embodiment.
Modulation signals in the pre-pit area and the MO area, and P
5 is a chart showing an operation of an LL signal.

As described above, the modulation signal in the MO area is a (1,7) RLL code, and the modulation signal in the pre-pit area is an EFM plus code. However, EFM pl
Instead of the us code, a (2,7) RLL code may be used.

The minimum signal inversion section of the (1, 7) RLL modulation method is 2. On the other hand, since the minimum signal inversion section of the EFM plus modulation method is 3, the ratio between the two minimum signal inversion sections is 3: 2 = 1.5: 1.

The (1,7) RLL modulation method is 2 → 3
Because of the conversion, the ratio of the bit length to the original data is 3T / 2 = 1.5. In contrast, EFM pl
Since the us modulation method is 8 → 16 conversion, the ratio of the bit length to the original data is 16T / 8 = 2. Therefore, the ratio between the two is 2: 1.5 ≒ 1.33: 1.

With this ratio, the normal recording and / or reproducing operation for the pre-pit area is performed,
It is sufficiently possible to perform recording and / or reproduction on the O region without error by the principle of MSR-CAD.

Therefore, according to the present embodiment, for the pre-pit area and the MO area having different recording densities,
Data recording and / or reproducing operation can be performed by applying a channel bit clock of the same frequency.
The fact that the channel bit clock is the same means that, in other words, it is only necessary to switch the data without switching the PLL circuit.

The recording density of the pre-pit area is set to MO
It is possible to record and / or reproduce data in both recording areas using the same frequency channel bit clock without reducing the area to half.

Therefore, according to this embodiment, the number of PLL circuits can be reduced, the transient characteristics can be improved, and an efficient preformat of a magneto-optical disk can be realized.

[Supplement] The present invention has been described in detail with reference to the specific embodiments. However, it is obvious that those skilled in the art can modify or substitute the embodiment without departing from the spirit of the present invention. That is, the present invention has been disclosed by way of example, and should not be construed as limiting. In order to determine the gist of the present invention, the claims described at the beginning should be considered.

[0071]

As described above in detail, according to the present invention,
For a magneto-optical disk of the type in which the pre-pit area and the MO area coexist, without increasing the device cost,
An excellent data recording and / or reproducing apparatus and a data recording and / or reproducing method capable of improving the data recording efficiency of the entire disc can be provided.

Further, according to the present invention, for a magneto-optical disk of a type in which a pre-pit area and an MO area coexist, the data recording efficiency of the entire disk can be improved without increasing the apparatus cost. An excellent data recording and / or reproducing apparatus and a data recording and / or reproducing method can be provided.

Further, according to the present invention, for a magneto-optical disk of the type in which the pre-pit area and the MO area coexist, the recording density of the pre-pit area does not need to be reduced more than necessary without increasing the apparatus cost. An excellent data recording and / or reproducing apparatus and a data recording and / or reproducing method can be provided.

According to the present invention, an efficient preformat for a magneto-optical disk can be realized. As a result, it is not necessary to lower the recording density of the pre-pit area by half compared to the MO area. In addition, since a channel bit clock having the same frequency can be used in both storage areas, only the data needs to be switched, and there is no need to switch hardware such as a PLL circuit or change the design.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a hardware configuration of a magneto-optical disk recording / reproducing apparatus 1 provided for implementing the present invention.

FIG. 2 is a chart showing an operation of a modulation signal and a PLL signal in a pre-pit area and an MO area of the disk 100 in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk recording / reproducing apparatus 11 ... Spin motor, 12 ... Pickup part 14 ... RF circuit, 15 ... Servo circuit 16 ... Data demodulation circuit, 17 ... ECC decoding circuit 18 ... Address demodulation circuit, 19 ... Address ECC decoding Circuit 20 Control part 21 Laser power control circuit 22 LD drive circuit 25 ECC addition circuit 26 Data modulation circuit 27 Magnet drive circuit 28 External coil generating coil 30 Host interface 100 Light Magnetic disk

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 11/105 501 G11B 11/105 501E 516 516F 521 521G 13/00 13/00 20/14 341 20/14 341Z 351 351A

Claims (25)

[Claims] 1. A method for recording data on a recording medium including a first recording area on which data is recorded at a first recording density and a second recording area on which data is recorded at a second recording density. A data recording / reproducing apparatus for recording and / or reproducing data, wherein data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock having the same frequency. A data recording / reproducing apparatus, wherein a second recording density lower than the first recording density is selected. 2. A method for recording data on a recording medium including a first recording area in which data is recorded by a first modulation method and a second recording area in which data is recorded by a second modulation method. A data recording / reproducing apparatus for recording and / or reproducing data, wherein data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock having the same frequency, and And selecting each of the first and second modulation methods so that the recording density in the second recording area is higher than the recording density in the first recording area. Playback device. 3. A method for recording data on a recording medium including a first recording area in which data is recorded by a first modulation method and a second recording area in which data is recorded by a second modulation method. A data recording / reproducing apparatus for recording and / or reproducing data, wherein data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock having the same frequency, and Each of the first and second modulation schemes is set such that the minimum signal inversion section of the signal mark in the first recording area is larger than the minimum signal inversion section of the signal mark in the second recording area. A data recording / reproducing apparatus characterized by selecting. 4. The method according to claim 1, wherein the first modulation scheme is EFM (Eight).
to Fourteen Modulation)
plus system or (2,7) RLL (Run Leng)
th Limited) method, and the second modulation method is a (1,7) RLL (Run Length L).
4. The data recording / reproducing apparatus according to claim 2, wherein the data recording / reproducing apparatus is of an (imposed) type. 5. A method according to claim 1, wherein said first modulation method modulates an 8-bit code into a 16-bit code, and said second modulation method modulates a 2-bit code into a 3-bit code. 4. The method according to claim 2, wherein
A data recording / reproducing apparatus according to any one of the above. 6. The first recording area is a pre-pit area for recording / reproducing data by an optical effect, and the second recording area is a pre-pit area.
4. The data recording / reproducing apparatus according to claim 1, wherein the recording area is an MO (Magneto Optical) area for recording / reproducing data by a magneto-optical effect. 7. The MO (Magneto Optica)
The data recording / reproducing apparatus according to claim 6, wherein 1) the area is a recording area employing a magnetic super-resolution method. 8. A method for recording data on a recording medium including a first recording area on which data is recorded at a first recording density and a second recording area on which data is recorded at a second recording density. A data recording / reproducing method for recording and / or reproducing data, wherein data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock having the same frequency. Data recording / reproducing method, wherein a second recording density lower than the first recording density is selected. 9. Data is recorded on a recording medium including a first recording area in which data is recorded by a first modulation method and a second recording area in which data is recorded by a second modulation method. A data recording / reproducing method for recording and / or reproducing, wherein data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock having the same frequency, and And selecting each of the first and second modulation methods so that the recording density in the second recording area is higher than the recording density in the first recording area. Playback method. 10. Data is recorded on a recording medium including a first recording area in which data is recorded by a first modulation method and a second recording area in which data is recorded by a second modulation method. A data recording / reproducing method for recording and / or reproducing, wherein data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock having the same frequency, and Each of the first and second modulation schemes is set such that the minimum signal inversion section of the signal mark in the first recording area is larger than the minimum signal inversion section of the signal mark in the second recording area. A data recording / reproducing method characterized by selecting. 11. The method according to claim 1, wherein the first modulation method is EFM (Eight).
t to Fourteen Modulation)
plus method or (2,7) RLL (Run Len
gth Limited), and the second modulation scheme is a (1, 7) RLL (Run Length).
(Limited) system.
Or the data recording / reproducing method according to any one of the above items 10. 12. The first modulation system modulates an 8-bit code into a 16-bit code, and the second modulation system modulates a 2-bit code into a 3-bit code. 11. The data recording / reproducing method according to claim 9, wherein: 13. The first recording area is a pre-pit area for recording and reproducing data by an optical effect, and the second recording area is a magneto optical (MO) for recording and reproducing data by a magneto-optical effect. The data recording / reproducing method according to claim 8, wherein the data recording / reproducing method is an area. 14. The MO (Magneto Optic).
14. The data recording / reproducing method according to claim 13, wherein the al) area is a recording area employing a magnetic super-resolution method. 15. A recording medium including a first recording area in which data is recorded at a first recording density and a second recording area in which data is recorded at a second recording density. A second recording density lower than the first recording density such that data can be recorded and / or reproduced from both the first and second recording areas using a channel bit clock of a frequency; A recording medium, wherein is selected. 16. A recording medium including a first recording area on which data is recorded by a first modulation method and a second recording area on which data is recorded by a second modulation method, wherein Data can be recorded and / or reproduced from both the first and second recording areas using a channel bit clock having a frequency, and the recording density in the second recording area is higher than the recording density in the first recording area. A recording medium, wherein each of the first and second modulation methods is selected such that a recording density in a recording area is higher. 17. A recording medium including a first recording area in which data is recorded by a first modulation method and a second recording area in which data is recorded by a second modulation method, wherein Data can be recorded and / or reproduced in both the first and second recording areas using a channel bit clock of a frequency, and a minimum signal inversion section of a signal mark in the first recording area can be recorded. The recording medium according to claim 1, wherein each of the first and second modulation methods is selected such that the length is larger than a minimum signal inversion section of the signal mark in the second recording area. 18. The method of claim 1, wherein the first modulation method is EFM (Eight).
t to Fourteen Modulation)
plus method or (2,7) RLL (Run Len
gth Limited), and the second modulation scheme is a (1, 7) RLL (Run Length).
2. A limited (Limited) method.
18. The recording medium according to any one of 6 and 17. 19. The method according to claim 1, wherein the first modulation method modulates an 8-bit code into a 16-bit code, and the second modulation method modulates a 2-bit code into a 3-bit code. The recording medium according to claim 16, wherein: 20. The first recording area is a pre-pit area for recording / reproducing data by an optical effect, and the second recording area is a MO (Magneto Optical) for recording / reproducing data by a magneto-optical effect. 18. The recording medium according to claim 15, wherein the recording medium is an area. 21. The MO (Magneto Optical)
21. The recording medium according to claim 20, wherein the al) area is a recording area employing a magnetic super-resolution method. 22. A format method for a recording medium including first and second recording areas having different recording densities, wherein an EFM (Eight to Right) is applied to the first recording area.
FourteenModulation) plus
System or (2,7) RLL (Run Length L
(Limited) method and a (1, 7) RLL (Run Length) for the second recording area.
h Limited) method, wherein a recording and / or reproducing operation using a channel bit clock of the same frequency is enabled for the first and second recording areas. Formatting method for 23. A format method for a recording medium including first and second recording areas having different recording densities, wherein an 8-bit code is converted to a 16-bit code for the first recording area. And a 2-bit code for the second recording area.
A recording medium characterized in that a recording and / or reproducing operation using a channel bit clock of the same frequency can be performed on the first and second recording areas by applying a method of modulating a code. Formatting method for 24. The first recording area is a pre-pit area for recording / reproducing data by an optical effect, and the second recording area is a MO (Magneto Optical) for recording / reproducing data by a magneto-optical effect. The format method for a recording medium according to claim 22, wherein the format method is an area. 25. The MO (Magneto Optical)
25. The method according to claim 24, wherein the al) area is a recording area employing a magnetic super-resolution method.