JPH10124879A - Disk-shaped recording medium and disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk-shaped recording medium and a disk recording/ reproducing device capable of improving the performance of a data transfer speed and an access speed. SOLUTION: This disk-shaped recording medium has a spiral or concentric groove 3, the groove 3 is divided into plural zones 1, 2 in the radial direction, physical address information and sector boundary information 2a are recorded by wobbling the groove, the wobbling frequency of the physical address information obtained at the time of rotating the medium at a constant angular velocity is constant in the respective zones and is increased in a zone on the outer peripheral side and recording data are arranged on the groove corresponding to the sector boundary information 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recordable disc-shaped recording medium having a large capacity and capable of improving data transfer speed performance and access speed performance, and recording of various data using the disc-shaped recording medium. The present invention relates to a disk recording / reproducing apparatus for performing reproduction.

[0002]

2. Description of the Related Art In recent years, optical disk devices have been used as devices for randomly recording and reproducing a large amount of information. In such an optical disk device, in order to increase the storage capacity, the frequency of the recording data is kept constant, and the relative speed between the optical pickup and the disk is kept constant.
LV system: Constant Linear Velo
(city system), the linear recording density is kept constant at any place on the disk, and a large capacity is realized. This CL
In the V system, the number of sectors per one rotation of the disk differs depending on the radial position, and the storage capacity is large. However, since the number of rotations needs to be changed according to the radial position of the disk, there is a disadvantage that the access time becomes long.

On the other hand, in order to shorten the access time,
Constant angular velocity method (CAV method: Constant Ang) in which the frequency of recording data and the number of rotations of the disk are constant.
(Ultra Velocity method). This CAV
In this method, the access time is short because it is not necessary to change the rotation speed of the disk, but the number of sectors per rotation of the disk is constant regardless of the radial position. It is not suitable for increasing the capacity.

[0004] Therefore, a method of recording / reproducing (ZCAV) by keeping the rotation speed of the disk constant and changing the frequency of the recording data stepwise according to the radial position of the disk.
Method: Zone Constant Angular
Velocity method) has been put to practical use. In this method, the inner circumference to the outer circumference of a disk are divided into a plurality of zones in the radial direction, and the number of sectors per rotation of the disk is constant in each zone. Increase the number. As described above, in the ZCAV system, zoning is performed so that the linear recording density is substantially constant irrespective of the radial position of the disk, thereby improving the storage capacity and shortening the access time.

FIGS. 22 to 24 are schematic views showing a disk configuration based on the ZCAV system. In FIG. 22, the disk 101 is divided into three zones of an area 101a, an area 101b, and an area 101c from the outer periphery of the disk. Each of the areas is composed of a plurality of sectors per rotation of the disk, and the number of sectors per rotation of the disk is the same for each area.

FIG. 23 is an enlarged view of this situation. The area 101a (zone 1) and the area 101b (zone 2) are composed of a plurality of grooves 103, and the grooves 103 indicate physical sector addresses on the disk. Field 102 in which the header 102a shown and the recording data are arranged
02b, a plurality of sectors 102 are arranged in one rotation of the disk, and an area 1 in the same zone
In the area 01a and the area 101b, boundaries of the sectors are radially arranged on the disk surface.

FIG. 24 is an enlarged schematic view of the vicinity of the header. The header 102a is preformed together with the groove in an embossed form called a pit in which the groove is blocked by physical sector address information.

As shown in FIG. 25, the header 102a has a sector mark 104 indicating the start of a sector and a PLL for generating a clock necessary for reproducing a physical sector address.
(Phase Locked Loop), a VFO field 105 for performing phase pull-in, an address mark 106 indicating the start of a physical sector address, an address field 107 being a physical sector address, and error detection for detecting an error in the address field It consists of a field 108.

In a disk recording / reproducing apparatus using a disk based on the ZCAV system, as shown in FIG.
The disc is handled. That is, the disk rotation speed is 25
As shown by the dotted line b, while being constant irrespective of the radial position of the disk (in other words, the linear velocity becomes higher toward the outer periphery),
The data frequency of recording / reproduction related to the data transfer speed is 2
As shown by the solid line 5a, the recording clock and the reproduction clock are generated and used so that they change in the above-mentioned zone unit and the data frequency becomes higher toward the outer periphery of the disk. This makes it possible to perform an access operation at a high speed because there is no need to change the rotational speed of the disk, and to increase the linear recording density in the radial direction by increasing the data frequency as the linear velocity increases in the outer peripheral direction of the disk. Since it can be made substantially constant regardless of the above, the storage capacity can be improved as compared with the CAV method.

[0010]

Heretofore, the above-mentioned various discs have been appropriately selected and used according to their characteristics and intended use. For example, when recording continuous data such as video, the access speed performance is not so desired, but on the other hand, the storage capacity is emphasized and the data transfer speed is desired, so the CLV method is used. In the case of (1), since it is necessary to randomly record and reproduce discrete data, the ZCAV method is used with emphasis on access performance, and discs of these methods have completely different formats. As a manufacturer, it is necessary to cope with a plurality of methods, and the existence of a plurality of types of discs is causing confusion for users.

In the above-described conventional apparatus for recording / reproducing a ZCAV system disk, the access speed is high, but as shown in FIG. 26, the data frequency, that is, the transfer speed of the recording / reproduction data is high on the outer peripheral side of the disk, This is especially important when transferring continuous data such as video at high speed or when using it for backup purposes.
It is disadvantageous in data transfer speed as compared with the V system.

Further, since the disk rotational speed in the ZCAV system is constant, the disk rotational speed on the inner peripheral side is lower than in the ZCLV system in which the disk rotational speed is higher on the inner peripheral side than on the outer peripheral side. This increases the so-called rotation waiting time until the disk reaches a desired sector position within one rotation of the disk, which is disadvantageous in terms of access speed.

On the other hand, if an attempt is made to realize a recording / reproducing apparatus corresponding to a plurality of types of discs according to the purpose, there is a problem that the cost is increased because the formats are different.

In a ZCAV system disk, as shown in FIGS. 23 and 24, sector boundaries, which are the minimum units for recording and reproduction, are arranged radially in the disk radial direction. Are the same number of sectors per one rotation of the disk. this is,
In the case where the radial sector arrangement is not radially aligned, the header 102a preformed in the form of pits has the data field 1 of the groove adjacent in the disk radial direction.
This is because crosstalk is adversely effected on 02b, and therefore, by arranging the headers 102a radially in each zone in each zone,
The data field is always arranged in the groove adjacent to the data field 102b (in other words, the header is not arranged), and the reliability of the data field 102b for recording data is secured. .

However, in order to radially arrange the sectors in the radial direction, the number of sectors having a predetermined physical length and a predetermined physical length must be a positive integer number per rotation. In addition, the recording medium or the recording / reproducing apparatus must be configured with a lower linear recording density than the original recording density performance.

As a specific example, the original recording density performance of a disk or a recording / reproducing apparatus is 0.5 μm per bit.
m, and the number of bits constituting one sector is 20,000 bits, the physical length of one sector is 10 mm.
When assigning to the zone of m, the circumference is about 188.5 mm
/ 10 mm ≒ 18.85 sectors, but as described above, it is necessary to arrange a positive integer number of sectors per rotation.
Eight sectors must be allocated. Therefore, when the number of sectors per rotation is set to 18 and the bit size at a position of a radius of 30 mm is calculated backward, 0.523 μm is obtained.
m, which is about 5% from the performance of 0.5 μm per bit, which is the original recording density performance of the disc or the recording / reproducing apparatus.
In this case, there is a problem that the linear density decreases and the storage capacity decreases.

In the zones, as described above, by arranging the boundaries of the sectors radially in the disk radial direction, it is possible to avoid crosstalk to the data field of the header. As shown in FIG. 24, a state occurs in which a header of a zone adjacent to a data field in each zone is arranged as seen at the boundary between the regions 101a and 101b, and crosstalk occurs between these zones. Each groove at the boundary cannot be used, and there is also a problem that the storage capacity is reduced here.

On the other hand, in the disk shown in FIG. 24, data is recorded on the grooves. To improve the recording density in the disk radial direction, it is necessary to reduce the pitch between the grooves. However, there is a problem that it is difficult to reduce the groove pitch because headers adjacent in the radial direction cause interference.

An object of the present invention is to provide a disk-shaped recording medium and a disk recording / reproducing apparatus which have a large capacity and can improve data transfer speed performance and access speed performance in view of the above problems.

[0020]

According to a first aspect of the present invention, there is provided a disk-shaped recording medium having a spiral or concentric groove, wherein a groove to be followed by a light beam is divided into a plurality of zones in a radial direction. The physical address information and the sector boundary information are recorded by wobbling the groove, and the wobble frequency of the physical address information obtained when rotating at a constant angular velocity is constant within each zone and increases as the zone on the outer periphery increases. It is characterized in that recording data is arranged on a groove or a land corresponding to the boundary information.

[0021] The disk-shaped recording medium according to claim 2 is
The disk-shaped recording medium according to claim 1, wherein the number of sectors per rotation when the sector length is a predetermined length includes a zone that is not a positive integer.

[0022] The disk-shaped recording medium according to claim 3 is
2. The disk-shaped recording medium according to claim 1, wherein the recording data is arranged in a groove at a zone boundary.

According to a fourth aspect of the present invention, there is provided a disk recording / reproducing apparatus for performing recording / reproducing using the disk-shaped recording medium according to any one of the first to third aspects. Rotation control means for rotating by a number, reference clock generation means for generating a reference clock corresponding to a wobble frequency from physical address information, and recording data on a groove or a land of a disc-shaped recording medium based on the reference clock. , And reproduction control means for reproducing recorded data on a groove or a land of a disc-shaped recording medium based on the reference clock.

According to a fifth aspect of the present invention, there is provided a disk recording / reproducing apparatus for performing recording / reproducing using the disk-shaped recording medium according to any one of the first to third aspects, wherein the wobble frequency from the physical address information is changed. Rotation control means for performing rotation so as to be constant in each zone; recording control means for recording recording data on a groove or a land of a disk-shaped recording medium based on a fixed reference clock; and Reproduction control means for reproducing recorded data on a groove or a land of a disk-shaped recording medium.

According to a sixth aspect of the present invention, there is provided a disk recording / reproducing apparatus for performing recording / reproduction using the disk-shaped recording medium according to any one of the first to third aspects. A first rotation control means for rotating by a number, a second rotation control means for performing rotation so that a wobble frequency from physical address information is constant in each zone, and a first rotation control means and a second rotation control means. Rotation control switching control means, reference clock generation means for generating a reference clock corresponding to the wobble frequency from the physical address information, and disk-shaped recording based on the reference clock when the first rotation control means is selected. Recording data is recorded on a groove or a land of the medium, and when the second rotation control means is selected, based on a certain reference clock, Recording control means for recording the recording data on the groove or land of the disk-shaped recording medium; and when the first rotation control means is selected, on the groove or land of the disk-shaped recording medium based on the reference clock. Reproduction control means for reproducing recorded data and reproducing recorded data on a groove or a land of a disk-shaped recording medium based on a fixed reference clock when the second rotation control means is selected. Features.

According to a seventh aspect of the present invention, in the disk recording / reproducing apparatus according to the fourth or sixth aspect, the reference clock generating means is shared by the recording control means and the reproduction control means. It is characterized by having been done.

According to a eighth aspect of the present invention, there is provided the disk recording / reproducing apparatus according to the fourth or sixth aspect, wherein the rotation control means has a different frequency for each zone obtained from the disk-shaped recording medium. And a programmable frequency divider for generating a reference frequency corresponding to the rotation control information.

According to a ninth aspect of the present invention, there is provided the disk recording / reproducing apparatus according to any of the fourth to sixth aspects, wherein the address conversion means converts a given logical address into physical address information of a groove or a land. The address translation means assigns to the given logical address in the continuous ascending order such that the value of the physical address information is sequentially increased in the order of the groove and the land or the land and the groove in each zone. Features.

According to a tenth aspect of the present invention, there is provided the disk recording / reproducing apparatus according to the ninth aspect, wherein:
The above-mentioned address translating means, the order of the groove and land,
It is characterized in that the assignment is performed so as to be switched for each adjacent zone.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 of the disk-shaped recording medium of the present invention will be described below.

FIGS. 1 to 3 are schematic views showing the form of a disk-shaped recording medium according to the present invention. In FIG. 1, the disk 1 is divided into three zones of an area 1a, an area 1b, and an area 1c from the outer periphery of the disk. Each area is composed of a plurality of sectors per disk rotation, and the number of sectors per disk rotation is the same for each area.

FIG. 2 is an enlarged view of this situation. The area 1a (zone 1) and the area 1b (zone 2) are composed of a plurality of grooves 3, and the groove 3 is divided by a sector boundary 2a. A plurality of sectors 2 are arranged in one rotation of the disk, and within each zone, sector 2
Are radially arranged on the disk surface so as to be aligned at the sector boundary 2a. Here, the number of sectors is set to be larger in the zone on the outer peripheral side, and the groove 3 is formed in a spiral or concentric shape.

FIG. 3 is a schematic diagram in which the sector boundary 2a and the vicinity of the zone boundary are further enlarged. The groove 3 is frequency-modulated after physical address information indicating the actual address value of the sector of each groove is subjected to two-phase mark modulation. , Disk 1
Is formed in advance in a form in which the light beam wobbles in the following direction, and forms prerecorded information. As the wobble frequency, an intermediate frequency band between the recording information band and the tracking servo band is assigned, and the wobble center frequency is set to the area 1a, the area 1b, and the area 1c when the disk is rotated at a constant rotation speed. Are set so as to be constant in the sector of the groove in each zone, and to have a higher frequency in the zone on the outer peripheral side of the disk.

FIG. 4 is a schematic diagram showing the allocation of the sector 2. FIG. 4a shows an information sequence constituting prerecorded information obtained by wobbling the groove in the direction in which the light beam of the disk follows. 3b and 3c in FIG. 4 respectively show examples of information sequences constituting sectors to which recording information recorded on the groove 3 is allocated.
In the following description, a case will be described in which a sector to which prerecorded information is assigned and a sector to which recorded information to be recorded on a groove are assigned have a one-to-one correspondence.

The pre-recorded information is as shown in FIG.
A synchronization signal 4 indicating the head of each sector of the prerecorded information;
An address field 5 indicating an actual address value and an error detection field 6 for detecting an error in the address field 5 constitute a sector. This pre-recorded information is continuously formed without interruption as tracking grooves in a form wobbled over the entire surface of the disk. The sector boundary 2a provided for convenience of explanation is
Corresponds to synchronization signal 4.

On the other hand, in the recording information recorded on the groove, a header 7 including a sector address, recording data (for example, about 4 kilobytes), an error detection and correction code, etc. are recorded as shown in FIG. The header 7 is formed not in a pit form but in a groove in the same manner as the information sequence in FIG. 25. As described above, the sector address is added to each sector by the header 7 as the recording information, so that the reliability of the sector address recognition can be improved as compared with a mode using only the address field 5 of the physical address information. Further, as shown in 3c of FIG. 4, it is also possible to use only a data field 9 in which recording data and an error detection / correction code are recorded without using a header as recording information. In this case, the header part is deleted. As a result, the data utilization rate can be increased, and the storage capacity can be further increased. It should be noted that the wobble frequency of the groove forming the pre-recorded information and the frequency (meaning of data rate) of the recorded information recorded in the groove always have a fixed relationship. That is, it means that the physical address information is allocated as the sector address to the sector 2 and a predetermined amount of recording data is arranged in this sector.

With this disc, it is possible to access a desired disc area by recognizing the physical address information even in an unrecorded area where no record information is recorded, using pre-recorded physical address information. 5 and FIG. 6 can be recorded and reproduced.

FIG. 5 shows a disc according to the present invention,
In the case of operating in the V method, the disk rotation speed is constant irrespective of the disk radial position as shown by 5b (dotted line), and the center frequency of the wobble frequency of the pre-recorded information including the physical address information is 5a ( As shown by a solid line), it is constant in each zone and becomes higher toward the outer periphery of the disk. Therefore, the frequency of the recording information can be increased in a predetermined relationship in accordance with the wobble frequency of the pre-recorded information in the zone on the outer peripheral side. Is performed, and the ZCAV operation in which the speed of the recorded information changes depending on the radial position of the disk is realized.

On the other hand, FIG. 6 shows a method of performing recording and reproduction on a disk according to the present invention by setting the relative speed between the optical pickup and the disk constant and switching the number of rotations stepwise according to the radial position of the disk (ZCLV method: Zoned
Constant Linear Velocit
In this method, the disk is rotated so that the center frequency 6a (solid line) of the wobble frequency of the pre-recorded information becomes a predetermined value in any zone. As a result, the CAV operation is performed at a constant rotation speed in the zone of the disk rotation speed 6b (broken line), and the rotation control by the ZCLV method is realized in which the rotation speed is lower in the zone on the outer peripheral side. Here, the fact that the wobble frequency of the pre-recorded information is constant means that the frequency of the recorded information is also constant.
Recording and reproduction are performed in a mode in which the number of sectors per rotation is large, and the operation of the ZCLV in which the speed of the recording information is constant even when the disk radial position changes is realized.

In this way, the ZC shown in FIG.
The operation according to the AV system and the operation according to the ZCLV system as shown in FIG. 6 can be realized using a common disc.

Further, in the above-mentioned disc form, since a pit-shaped header which adversely affects adjacent grooves due to crosstalk is not used, crosstalk from an adjacent zone in a groove at a zone boundary does not occur. Therefore, it is possible to arrange the recording information also for the groove at the zone boundary, so that the use efficiency of the groove can be made higher.

FIG. 9 illustrates another embodiment of the disc-shaped recording medium according to the first embodiment.
In this example, the side walls on both sides of the groove are wobbled and the recording information is arranged on the groove. On the other hand, only the side wall on one side is wobbled, and the arrangement of the recording information is on the groove 3a and sandwiched between the grooves. Recording is also performed on the land 3b, so-called land / groove recording can be realized.

Specifically, only the side wall on one side of the groove 3 is frequency-modulated after the physical address information is subjected to two-phase mark modulation as in the case of FIG. 3, and wobbled in the direction in which the light beam of the disk 1 follows. In advance, and constitutes prerecorded information. Therefore, the groove 3a
And the corresponding land 3b are common pre-recorded information, so that the obtained address values are also the same. As for the sector boundary 2a, both the groove 3a and the land 3b are radially aligned in the disk radial direction in each zone. As the wobble frequency, an intermediate frequency band between the recording information band and the tracking servo band is assigned, and the center frequency wobbled is equal to the area 1 when the disk is rotated at a constant rotation speed.
a, constant in each zone of the region 1b and the region 1c,
In addition, the frequency is set to be higher in the zone on the outer peripheral side of the disk.

With this configuration, in addition to the effects of the configuration described with reference to FIG. 3, the track density, which is the recording density in the disk radial direction, can be increased, and the capacity can be further increased. is there.

(Embodiment 2) Embodiment 2 of the disk-shaped recording medium of the present invention will be described below.

In the disk of the present invention, the area 1a, the area 1
b, the area is divided into three zones 1c. Each area is composed of a plurality of sectors per disk rotation, and the number of sectors per disk rotation is the same for each area.

FIG. 7 is an enlarged view of this situation. The area 1a (zone 1) and the area 1b (zone 2) are composed of a plurality of grooves 13. While being arranged in rotation,
In each zone and between the zones, the sectors 12 are arranged so that the sector boundaries 12a of the sectors 12 are not aligned in each groove, that is, are not radial on the disk surface. That is, when the physical length of a sector is a predetermined length, the disk 1
The number of sectors per revolution does not become a positive integer, so that the sector boundaries 12a adjacent in the disk radial direction do not match. this is,
This is made possible by not using a conventional pit-shaped header that adversely affects adjacent grooves due to crosstalk. Compared with the conventional case, the original linear recording density performance is obtained at a position with a disk radius of 30 mm, for example. This means that 18.85 sectors can be arranged.
Here, the number of sectors is set to be larger in the outer zone,
The groove is formed spirally or concentrically.

FIG. 8 is a schematic diagram in which the sector boundary 12a and the vicinity of the zone boundary are further enlarged. The groove 13 is frequency-modulated after physical address information indicating the actual address value of the sector of each groove is subjected to two-phase mark modulation. Is preformed in such a form that the light beam of the disk 1 wobbles in the following direction, and forms prerecorded information. As the wobble frequency, an intermediate frequency band between the recording information band and the tracking servo band is assigned, and the wobble center frequency is set to the area 1a, the area 1b, and the area 1c when the disk is rotated at a constant rotation speed. Are set so as to be constant in the sector of the groove in each zone, and to have a higher frequency in the zone on the outer peripheral side of the disk. Here, as described above, the sector boundaries 12a do not always coincide between adjacent grooves even in the same zone. The allocation of the sectors 12 can be performed in the same manner as in FIG.

With this disc, it is possible to access a desired disc area by recognizing the physical address information even in an unrecorded area where no record information is recorded, using pre-recorded physical address information. The operation by the ZCAV method described in FIG. 5 and the operation by the ZCLV method described in FIG. 6 can be realized using a common disk, and the number of sectors per one rotation of the disk does not need to be a positive integer. Accordingly, the recording medium and the disk recording / reproducing apparatus have a form in which the linear recording density performance can be sufficiently obtained, and a disk-shaped recording medium with high data use efficiency can be realized.

FIG. 10 illustrates another embodiment of the disc-shaped recording medium according to the second embodiment. In FIG. 8, the side walls on both sides of the groove are wobbled and the recording information is arranged on the groove. On the other hand, only the side wall of one side of the groove is wobbled, and the arrangement of the recorded information is on the groove 13a and on the land 1 between the grooves.
This is a form in which recording is also performed on 3b, so-called land / groove recording can be realized.

More specifically, only one side wall of the groove 13 is frequency-modulated after two-phase mark modulation of the physical address information in the same manner as in FIG.
Is formed in advance in a form in which the light beam wobbles in the following direction, and forms prerecorded information. Therefore, since the pre-recorded information is common to the groove 13a and the corresponding land 13b, the obtained address value is also the same. The sector boundary 12a has a form in which a groove 13a and a land 13b to which a common pre-recorded address is assigned in each zone are radially aligned in the disk radial direction. It is not radially radial between lands. As the wobble frequency, an intermediate frequency band between the recording information band and the tracking servo band is assigned, and the wobble center frequency is set to the area 1a, the area 1b, and the area 1c when the disk is rotated at a constant rotation speed. In each zone, the frequency is set to be constant, and to be higher in the zone on the outer peripheral side of the disk.

With this configuration, in addition to the effects of the configuration described with reference to FIG. 8, the track density, which is the recording density in the disk radial direction, can be increased, and the capacity can be further increased. It is.

(Embodiment 3) The following will describe Embodiment 3 of the disk recording / reproducing apparatus of the present invention.

FIG. 11 shows Embodiment 1 or Embodiment 2.
A disk recording medium of the ZCAV system that applies the disk-shaped recording medium of the mode described in (1) to a magneto-optical disk and records and reproduces the recorded information using this disk is described. FIG. 2 is a configuration diagram showing a spin motor 20 for supporting and rotating the magneto-optical disk 1 and emitting a laser based on a drive signal from a laser drive circuit 21 to a desired position on the rotating magneto-optical disk 1 An optical head 22 that irradiates a laser beam to the laser beam, detects reflected light from the magneto-optical disk 1 during reproduction, and irradiates a laser beam with a higher intensity than during reproduction during recording, and detection from the optical head 22 An RF amplifier 23 that amplifies the signal to generate a signal for each purpose such as a reproduction data signal, a wobble signal, and a servo error signal; A magnetic head 32 for applying a magnetic field to 1
A rotation control circuit 26 for controlling the rotation speed of the spin motor 20 to be constant; a focusing and tracking control of the optical head 22 based on a servo error signal from the RF amplifier 23 and an instruction from the controller 35; A servo control circuit 24 for performing feed control;
A wobble detection circuit 25 for detecting a wobble signal from a tracking error signal from the amplifier 23, and a wobble signal from the wobble detection circuit 25 is demodulated and decoded to enable detection of a light beam position on the magneto-optical disk 1. An address detection circuit 27 for obtaining physical address information;
3, a host interface 34 for sending and receiving recording / reproducing instructions and recording / reproducing data from a higher-level device, and error detection / correction information added to the recording data from the host interface 34 to generate data necessary for recording. Further, a recording data processing circuit 30 that modulates the data into a format suitable for recording according to a recording clock from the clock generation circuit 29, and a magnetic field for generating a magnetic field corresponding to the recording data from the recording data processing circuit 30. A magnetic head driving circuit 31 for driving a head 32; a reproduced data processing circuit 28 for demodulating a reproduced data signal from the RF amplifier 23 and sending data obtained by correcting an error in the reproduced data to a host interface 34; And a controller 35 for controlling each section of the playback apparatus. These sections are connected as shown in the figure. It has been.

FIG. 12 is a block diagram showing the details of the laser drive circuit 21. The F / V converter 21a for converting the frequency of the wobble signal extracted by the wobble detection circuit 25 into a voltage and the F / V converter Power control circuit 21 for controlling the emission power of the laser based on the converted voltage
b.

FIG. 13 is a block diagram showing the details of the clock generation circuit 29. The first comparison is carried out to compare the phase of the wobble signal extracted by the wobble detection circuit 25 with the frequency-divided signal from the first frequency-dividing circuit 29d. A phase comparison circuit 29a, a first LPF 29b for cutting high-frequency components of the phase difference signal from the first phase comparison circuit 29a, and a first V for generating a recording reference clock based on the phase difference signal from the first LPF 29b.
A recording reference clock generation unit including an FO 29c, a first frequency dividing circuit 29d for dividing the frequency of the first VFO 29c to a frequency corresponding to the wobble signal, and a wobble signal extracted by the wobble detection circuit 25 and a second Circuit 2
9h, a second phase comparison circuit 29e for comparing the phases of the frequency-divided signals from 9h, a second LPF 29f for cutting high-frequency components of the phase difference signal from the second phase comparison circuit 29e, and a second LPF.
A second VFO 29g for generating a reference clock for recording based on the phase difference signal from F29f, and a second VFO 29g for dividing the frequency of the second VFO 29g to a frequency corresponding to the wobble signal.
And a reproduction reference clock generation unit composed of a frequency dividing circuit 29h. Here, the recording reference clock generation unit and the reproduction reference clock generation unit are PLL
(Phase Locked Loop), and the frequency division ratio set by the first frequency dividing circuit 29d is given by the ratio between the frequency required for the recording reference clock and the wobble signal frequency, and set by the second frequency dividing circuit 29h. The frequency division ratio is given by the ratio between the frequency required for the reproduction reference clock and the wobble signal frequency. For example, the wobble signal frequency in the first zone of the magneto-optical disk 1 at a predetermined rotation speed is 50
KHz, a recording reference clock corresponding thereto (usually an integer multiple of the channel bit frequency of the recording data is selected) is 23.2 MHz, and a reproduction reference clock (normally the channel bit frequency of the reproduction data is selected) is 11.6 MHz.
z, the frequency division ratio in the first frequency dividing circuit is 1/4
64 is set, and the frequency division ratio in the second frequency dividing circuit is set to 1/232. The clock generation circuit 29 generates a recording reference clock and a reproduction reference clock that always have a fixed frequency ratio corresponding to the frequency of the wobble signal. In this embodiment, the case where the frequency of the recording reference clock and the frequency of the reproduction reference clock are different is described. However, when the frequency is the same, simplification can be achieved by sharing the components of the PLL.

On the other hand, the magneto-optical disk 1 is used in the first embodiment.
Or, because it has the form described in Embodiment 2,
In this embodiment in which the disk rotation speed is controlled to be constant,
The frequency of the wobble signal changes corresponding to each zone on the magneto-optical disk 1, and the wobble frequency becomes higher in the zone on the outer peripheral side of the disk. Therefore, the laser drive circuit 21
, The laser emission power corresponding to each zone is controlled in accordance with the wobble frequency, while the clock generation circuit 29 also controls the laser emission power in accordance with the wobble frequency.
A reference clock for recording and reproduction corresponding to each zone is generated.

The recording / reproducing operation in the above-mentioned disk recording / reproducing apparatus will be described below.

First, the recording operation will be described with reference to FIG. FIG. 14 is a flowchart showing a recording operation flow in the disk recording / reproducing apparatus. When a recording instruction is given from the host device through the terminal 33, the controller 3
5 recognizes the recording instruction via the host interface 34, and the processing for the recording operation is started (s1). s2
The controller 35 calculates the physical sector address value Pa from the recording start designated sector address instructed by the host device.
Is set, and the designated number of recording sectors is set as WS. Next, at s3, the controller 35 performs an access operation to a track including the sector position where recording is to be performed. With respect to this access operation, the controller 35 recognizes the current address value sequentially obtained from the address detection circuit 27 and controls a feed motor (not shown) and the optical head 22 via the servo control circuit 24 to control the light to a desired position. Beam movement is performed. When the light beam is moved to a desired position, the wobble detection circuit 2
5, a wobble signal in the groove or land where the light beam is currently tracing is extracted. Based on the frequency of the wobble signal, a wobble signal required at a disk radial position corresponding to the current light beam position, in other words, a wobble signal is extracted. The reproduction and recording laser powers matching the linear velocity between the disks are set by the laser drive circuit 21 (strictly, the set reproduction power is used during the address search period until the start of recording, and the recording power described later is used). The recording power set at this time is used), and a recording reference clock that matches the zone of the disk radial position corresponding to the current light beam position is generated by the clock generation circuit 29. Then, s
At 4, it is determined whether or not the current address value obtained by the address detection circuit 27 matches Pa, and if it does, it reaches s5 and recording in sector units is started. Here, as the recording data of the sector indicated by 3c in FIG. 4, the recording data input from the host device via the host interface 34 from the host device by the recording data processing circuit 30 via the host interface 34 has a predetermined sector size, for example, every 4096 bytes. Data generation is performed by performing generation and addition of an error detection and correction code or the like separately. These generated data strings are sent to the magnetic head drive circuit 31 as modulated data for one sector based on the recording reference clock from the clock generation circuit 29, and the magnetic head 32 outputs a modulated magnetic field corresponding to the sector data. Is applied, and a light beam having a recording intensity based on the wobble frequency from the wobble detection circuit 25 is irradiated from the optical head 22 to record data in a desired sector. s
When the recording of one sector is completed in 5, the recording sector number WS is updated in s6, and in s7, it is determined whether or not the WS is "0". The end of the operation is determined. Here, if the recording is completed, the process reaches s8 to end the recording process. If the recording is not completed, the process returns to s5. Thereafter, by repeating the above operation, the data corresponding to the number of sectors specified by the higher-level device is read. The recording is performed.

Next, the reproducing operation will be described with reference to FIG. FIG. 15 is a flowchart showing a reproducing operation flow in the disk recording / reproducing apparatus. When a reproduction instruction is given from the host device through the terminal 33, the controller 3
5 recognizes the reproduction instruction via the host interface 34, and the processing for the reproduction operation is started (s20). s
At 21, the controller 35 sets the physical sector address value Pa from the reproduction start designation address instructed by the host device, and sets the instructed number of reproduction sectors as RS. Next, at s22, the controller 35 performs an access operation to a track including Pa which is a sector position to be reproduced. When the light beam is moved to a desired position, a wobble signal in the groove or land where the light beam is currently tracing is extracted from the wobble detection circuit 25, and based on the frequency of the wobble signal, the wobble signal is moved to the current light beam position. The reproducing laser power required at the corresponding disk radial position, in other words, the reproducing laser power corresponding to the linear velocity between the light beam and the disk is set by the laser drive circuit 21, and the zone at the disk radial position corresponding to the current light beam position is set. Are generated by the clock generation circuit 29. Then, in s23, it is determined whether or not the current reproduction address obtained from the address detection circuit 27 matches Pa, and if it does, the process reaches s24 and reproduction of the desired sector is performed. Specifically, based on the reproduction reference clock from the clock generation circuit 29, the reproduction data processing circuit 28 decodes the data field accompanied by the error correction processing, and the host interface 3
4 to the host device via the terminal 33. s24
When the reproduction of one sector is completed, the values of the reproduction sector address Pa and the number of reproduction sectors RS are updated in s25,
At s26, it is determined whether or not the reproduction process for the specified number of sectors has been completed. If the process has been completed, the process reaches s27. If the process has not been completed, the process returns to s23, and the above-described processing is repeated.

As described above, in the present disk recording / reproducing apparatus, the logical address of the recording / reproducing specified by the host device is converted into the physical address information on the corresponding disk, and the disk is rotated at a constant rotational speed. The recording and reproduction are performed based on a wobble signal extracted at a different frequency for each zone. For this reason, ZCA
The V-system can perform a high-speed access operation to a desired position without changing the number of revolutions while securing a large capacity, and is adapted to each zone based on a wobble signal preformed on the disk by the ZCAV system. Recording and reproduction can be performed. Since the wobble signal is extracted at a different frequency for each zone in the present embodiment in which the number of rotations is constant, a clock generation circuit serving as a reference for recording and reproduction is provided for each zone as in the related art. Since there is no need to obtain the light beam corresponding to the area on the disk where the light beam is actually being traced, generation of the recording / reproducing clock can be realized with a simple configuration. Also, regarding the control of the recording and / or reproducing light beam power, which is necessary because the linear velocity changes in accordance with the radial position of the disc,
It can be realized with a simple configuration as described above.

Next, another disk recording and reproducing apparatus according to the third embodiment will be described. In the following description, the same members as those described above are denoted by the same reference numerals.

FIG. 16 shows the first embodiment or the second embodiment.
A disk recording / reproducing apparatus of the ZCLV system in which the disk-shaped recording medium of the mode described in (1) is applied to a magneto-optical disk and recording / reproducing of the recording information is performed using the disk. FIG. 2 is a configuration diagram of a spin motor 20 for supporting and rotating the magneto-optical disk 1 and emitting a laser beam based on a drive signal from a laser drive circuit 41, thereby forming a desired laser beam on the rotating magneto-optical disk 1. A position is irradiated with a laser beam, and at the time of reproduction, reflected light from the magneto-optical disk 1 is detected,
At the time of recording, an optical head 22 that irradiates a laser beam with a higher intensity than at the time of reproduction, and amplifies a detection signal from the optical head 22 to generate a purpose-specific signal such as a reproduced data signal, a wobble signal, and a servo error signal. RF amplifier 23,
A magnetic head 32 for applying a magnetic field to the magneto-optical disk 1 during recording, and a rotation control circuit 4 for controlling the rotation speed of the spin motor 20 so that the magneto-optical disk 1 rotates at a substantially constant linear velocity.
A servo control circuit 24 for performing focusing and tracking control of the optical head 22 and feed control of a feed motor (not shown) based on a servo error signal from the RF amplifier 23 and an instruction from the controller 45;
3, a wobble detection circuit 43 for detecting a wobble signal from the tracking error signal from the tracking error signal 3; and an address for detecting the position of the light beam on the magneto-optical disk 1 by demodulating and decoding the wobble signal from the wobble detection circuit 43. An address detection circuit 27 for obtaining information; a host interface 34 for transmitting / receiving recording / reproduction instructions from a higher-level device via a terminal 33; and transmitting / receiving recording / reproduction data; and adding error detection / correction information and the like to the recording data from the host interface 34. A recording data processing circuit 30 for generating data necessary for recording, and further modulating these data into a format suitable for recording in accordance with a recording clock from a clock generation circuit 44; A magnetic head drive circuit 31 for driving a magnetic head 32 for generating a magnetic field corresponding to A reproduction data processing circuit 28 demodulates a reproduction data signal from the RF amplifier 23 and sends data obtained by performing error correction of the reproduction data to a host interface 34, and a controller 45 that controls each unit of the disk recording / reproducing apparatus. , These parts are connected as shown in the figure.

The rotation control based on the substantially constant linear velocity of the disk will be described. The rotation control circuit 42 compares the internally held rotation reference clock of a constant frequency with the wobble signal detected and supplied by the wobble detection circuit 43. And
It is configured to control the spin motor 20 to have the same frequency and phase.

Therefore, since the rotation is controlled so that the linear velocity of the disk becomes substantially constant in the above configuration, the frequency of the recording / reproducing information is constant irrespective of the zone of the disk. Since the power may be constant, the clock generation circuit 44 generates a preset recording reference clock and a reproduction reference clock, and the laser drive circuit 41 also has an optimum recording power and reproduction power at the corresponding linear velocity. Is given irrespective of the zone on the disk.

The recording / reproducing operation in the disk recording / reproducing apparatus is realized by the same flow as described above.
Although the explanation is omitted, the difference is that the linear velocity is almost constant,
That is, the number of revolutions changes in units of zones, the linear velocity does not change much, and the frequency of recording and reproduction information is constant. As described above, in the disk recording / reproducing apparatus of the present invention, the logical address of recording / reproduction specified by the host device is converted into the corresponding physical address on the disk, and the disk is rotated so that the wobble signal has a predetermined value. The rotation is controlled so that the linear velocity is substantially constant, and recording and reproduction are performed at a constant frequency regardless of the zone. For this reason, the ZCLV system can record and reproduce the recording information at a high transfer rate regardless of the radial position of the zone by rotating the disk so that a large capacity is secured and the linear velocity becomes substantially constant. . Here, since the wobble signal is pre-formed so that the wobble frequency is constant by changing the rotation speed for each zone, it is necessary to use a rotation sensor such as a rotary encoder as a conventional rotation detection signal. However, since the light beam is obtained as a rotation detection signal corresponding to the area on the disk where the light beam is actually being traced, rotation control with a substantially constant linear velocity can be realized with a simple configuration.

(Embodiment 4) Embodiment 4 of the disk recording / reproducing apparatus of the present invention will be described below. The disk recording / reproducing device in the present embodiment
It has a first rotation control mode (ZCAV system) for driving the magneto-optical disk 1 at a constant rotation speed and a second rotation control mode (ZCLV system) for driving the magneto-optical disk 1 at a constant linear velocity.

FIG. 17 shows Embodiment 1 or Embodiment 2.
Configuration of a disk recording / reproducing apparatus that applies the disk-shaped recording medium of the mode described in (i.e., a mode in which header information is not used for recording information) to a magneto-optical disk, and performs recording / reproduction of recording information using this disk A spin motor 20 for supporting and rotating the magneto-optical disk 1 and emitting a laser beam based on a drive signal from a laser drive circuit 21 to place the laser at a desired position on the rotating magneto-optical disk 1 An optical head 22 for irradiating a beam, detecting reflected light from the magneto-optical disk 1 at the time of reproduction, and irradiating a laser beam with a higher intensity than at the time of reproduction at the time of recording; An RF amplifier 23 that amplifies and generates a signal for each purpose such as a reproduced data signal, a wobble signal, and a servo error signal; A magnetic head 32 to be applied, a rotation control circuit 52 for controlling the rotation speed of the spin motor 20 so that the magneto-optical disk 1 rotates at a desired rotation speed based on an instruction from the controller 53, and a servo error signal from the RF amplifier 23. Control circuit 2 for performing focusing and tracking control of the optical head 22 and feed control of a feed motor (not shown) based on instructions from the controller 53 and the controller 53
4, a wobble detection circuit 51 for detecting a wobble signal from a tracking error signal from the RF amplifier 23, and detection of a light beam position on the magneto-optical disk 1 by demodulating and decoding the wobble signal from the wobble detection circuit 51. An address detection circuit 27 that obtains address information that enables
A host interface 34 for transmitting / receiving recording / reproducing instructions and recording / reproducing data from a host device via a terminal 33; and generating data necessary for recording by adding error detection / correction information and the like to the recording data from the host interface 34. A recording data processing circuit 30 for modulating the data in a format suitable for recording in accordance with a recording clock from a clock generation circuit 29; and a magnetic field for generating a magnetic field corresponding to the recording data from the recording data processing circuit 30. Magnetic head 32
Head Drive Circuit 31 for Driving, and RF Amplifier 23
A reproduction data processing circuit 28 for demodulating a reproduction data signal from the controller and sending error-corrected data to the reproduction data to a host interface 34; and a controller 53 for controlling each part of the disc recording / reproducing apparatus. Are connected as shown in the figure.

FIG. 18 is a block diagram showing the details of the rotation control circuit 52. A reference oscillator 52a for generating a clock signal at a predetermined frequency, and a clock signal from the reference oscillator 52a in accordance with frequency division information given from the controller 53. , And outputs a rotation reference clock corresponding to a wobble frequency at a desired disk rotation speed, a wobble signal extracted by the wobble detection circuit 51 and a rotation reference clock from the programmable frequency division circuit 52b. , And a LPF 52d that cuts high frequency components of the rotation error signal from the phase comparison circuit 52c to generate a rotation error signal,
Spin motor 2 using rotation error signal from PF 52d
And a drive circuit 52e for driving 0 to rotate.

The flow of the recording / reproducing operation in the disk recording / reproducing apparatus is realized by the same flow as that of the third embodiment, and the description is omitted, but different points will be described below.

The present disk recording / reproducing apparatus has a plurality of disk rotation control modes, a first rotation control mode in which the disk rotation speed is constant, and a linear velocity in which the linear velocity is substantially constant.
That is, it has a second rotation control mode in which the number of rotations changes in units of zones. In FIG. 18, the mode switching is performed by frequency division information provided by the controller 53 to the rotation control circuit 52. Specifically, in the first rotation control mode, the programmable frequency dividing circuit 52b
Is given a different value corresponding to the zone on the disc, and a smaller value is given toward the outer periphery of the disc. As a result, the output of the programmable frequency dividing circuit 52b is generated as a rotation reference clock having a higher frequency in the zone on the outer periphery of the disk, and the disk is rotated so that the wobble signal extracted from the wobble detection circuit 51 matches this rotation reference clock. As a result, rotation control at a constant disk rotation speed independent of the zone is realized.
In the second rotation control mode, the controller 5
The frequency division information given from 3 is a constant value irrespective of the zone on the disk. Therefore, rotation control is different for each zone on the disk, and rotation control with a substantially constant linear velocity is realized.

On the other hand, the laser drive circuit 21 and the clock generation circuit 29 are different from the third embodiment in the rotation control mode.
A configuration similar to that described above can be used. That is, since the laser drive circuit 21 controls the laser emission power corresponding to the change in the wobble frequency, the power corresponding to each zone on the magneto-optical disk 1 in the first rotation control mode is the same as in the third embodiment. The control is performed, and the wobble frequency is constant in the second rotation control mode. Accordingly, the laser emission power is constant regardless of the zone, and the operation corresponding to the rotation mode is performed by a common circuit. Becomes possible. Further, since the clock generation circuit 29 generates the recording reference clock and the reproduction reference clock corresponding to the change in the wobble frequency, in the recording and reproduction operations in the first rotation control mode, the same as in the third embodiment, A recording reference clock and a reproduction reference clock corresponding to each zone on the disk 1 are generated, and the wobble frequency is constant in the second rotation control mode. The recording reference clock and the reproduction reference clock are generated, and the operation corresponding to the rotation mode can be performed by the common circuit.

As described above, in this disk recording / reproducing apparatus,
In the first rotation control mode in which the logical address of recording / playback specified by the host device is converted into a corresponding physical address on the disk and the disk has a plurality of rotation control modes, and the disk is rotated at a constant rotation speed, Recording and reproduction are performed based on a wobble signal extracted at a different frequency for each zone, while recording is performed based on a wobble signal extracted at a constant frequency in a second rotation control mode in which the disk is rotated at a substantially constant linear velocity. And playback. For this reason, the ZCAV system is used as the first rotation control mode, and a high-speed access operation to a desired position can be performed without changing the number of revolutions while securing large capacity, and the disk is preformed on the disk by the ZCAV system. Recording and reproduction suitable for each zone can be performed based on the wobble signal. Here, the wobble signal is
In the first rotation control mode, the frequency is extracted at a different frequency for each zone, so that there is no need to provide a clock generation circuit serving as a reference for recording and reproduction for each zone as in the related art.
Since the light beam is actually obtained corresponding to the traced area on the disk, the generation of the recording / reproducing clock can be realized with a simple configuration. In addition, the control of the recording and / or reproducing light beam power, which is necessary because the linear velocity changes in accordance with the radial position of the disk, can be realized with the above simple configuration. Further, by securing a large capacity as the ZCLV method as the second rotation control mode and rotating the disk so that the linear velocity becomes substantially constant, recording and reproduction of recording information at a high transfer rate can be performed regardless of the radial position of the zone. I can do it. Here, since the wobble signal is pre-formed so that the wobble frequency is constant by changing the rotation speed for each zone, it is necessary to use a rotation sensor such as a rotary encoder as a conventional rotation detection signal. Since the light beam is obtained as a rotation detection signal corresponding to the area on the disk where the light beam is actually being traced, rotation control with a substantially constant linear velocity can be realized with a simple configuration.

(Embodiment 5) Embodiment 5 of the disk recording / reproducing apparatus of the present invention will be described below.

The disk recording / reproducing apparatus according to this embodiment is the magneto-optical disk 1 of the embodiment shown in FIG. 9 or FIG. Land where information was formed /
In the following description, a case will be described in which the apparatus shown in FIG. 11 of the third embodiment is implemented using the disk described with reference to FIG.

The magneto-optical disk 1 is divided into an area 1a, an area 1b, and an area 1c from the outer peripheral side as shown in FIG. 1, and the area 1a has physical address information as shown in FIG. It is composed of a set of a groove 13a and a land 13b. The region 1b is constituted by a set of a groove 13c and a land 13d (not shown), and the region 1c is constituted by a groove 13e and a land 13f (not shown). Here, the physical address information has the same value in adjacent lands / grooves, and also has a physical address value that sequentially increases from the outer circumference of the disk toward the inner circumference.

On the other hand, the logical address given by the higher-level device is converted by the controller 35 into a corresponding physical address, that is, a physical address preformed in a wobble form in the present embodiment, and an access operation is performed using this physical address. And a recording / reproducing operation is performed.

FIG. 19 is a diagram for explaining the conversion relationship between the logical address and the physical address performed by the controller 35 in the disk recording / reproducing apparatus according to the present embodiment, and shows the radial position of the disk (that is, from the outer side to the inner side). This means that the physical address having a value that increases by the corresponding value corresponds to the logical address value 19a specified by the host device. That is, the magneto-optical disk 1
Is assigned to the smallest group of logical addresses, and the land 13b of the same zone is assigned as a subsequent logical address group. A groove 13c, a land 13d, a groove 13e, and a land 13f are similarly allocated as a subsequent logical address group.

By allocating logical addresses in this manner, in the ZCAV system, a continuous logical address space is allocated to a groove and a land for zones having the same data transfer speed, so that the logical address value is small. It is convenient that the data transfer speed can be improved in the area.

When the user newly starts using the disk, the logical address value is used from the lower side. However, since the entire disk is rarely used up, the data transfer speed becomes faster as the user starts using the disk. User convenience can be improved. Further, in the ZCLV system, it is necessary to change the disk rotation speed for each zone. However, by allocating logical addresses as described above, particularly in a recording / reproducing operation using a continuous logical address space such as video information, the disk rotation speed is increased. Since there is an effect of reducing an access operation across zones involving a change in the number, the average transfer speed can be made higher.

FIG. 20 is a diagram for explaining the conversion relationship between the logical address and the physical address performed by the controller 35 according to another embodiment, and the radial position of the disk (ie, increasing from the outer circumference toward the inner circumference). This means that a physical address having a value corresponds to the logical address value 20a specified by the host device.

That is, the groove 13a in the area 1a of the magneto-optical disk 1 is assigned to the smallest logical address group, and the land 13b of the same zone is assigned as the subsequent logical address group. The land 13 d and the groove 13 are further followed as logical address groups.
c, a groove 13e, and a land 13f are allocated.

In other words, by alternately allocating grooves and lands with respect to the order to the logical address space allocated for each zone, switching from groove to land or continuous recording operation or reproduction operation across zones is performed. The switching from the land to the groove can be omitted, and the time required for the switching can be shortened.

(Embodiment 6) Embodiment 6 of the disk recording / reproducing apparatus of the present invention will be described below. The disk recording / reproducing device in the present embodiment
Among the magneto-optical disks described in the first or second embodiment, the disk shown in FIG. 9 or FIG. 10, that is, a land / groove recording disk on which prerecorded information is formed by the ZCAV method is used. In the following description, a case will be described in which the disc described in FIG. 10 is used in the apparatus in FIG. 16 according to the third embodiment.

As shown in FIG. 1, the magneto-optical disk 1
The area is divided into an area 1a, an area 1b, and an area 1c from the outer peripheral side. Further, as shown in FIG. 10, the area 1a is configured by a set of a groove 13a having physical address information and a land 13b. The region 1b includes a set of grooves 13c and lands 13d (not shown), and a region 1c.
Are each constituted by a set of grooves 13e and lands 13f (not shown). Here, the physical address information has the same value in adjacent lands / grooves, and also has a physical address value that sequentially increases from the inner circumference to the outer circumference.

On the other hand, the logical address given by the higher-level device is converted by the controller 45 into a corresponding physical address, that is, a physical address pre-formed in the form of a wobble in the present embodiment. Recording and reproduction are performed.

FIG. 21 is a diagram for explaining the conversion relationship between the logical address and the physical address performed by the controller 45 of the disk recording / reproducing apparatus of the present embodiment, and shows the radial position of the disk (that is, from the inner circumference to the outer circumference). This means that the physical address having a value that increases with the corresponding physical address corresponds to the logical address value 21a specified by the host device. That is, the groove 13e in the area 1c of the magneto-optical disk 1 is assigned to the smallest logical address group, and the land 13f in the same zone is assigned as the subsequent logical address group. Then, as a subsequent logical address group, the groove 13c, land 13d, groove 13a, land 1
3b is assigned.

By assigning logical addresses in this manner, in the ZCLV system, a continuous logical address space that does not require a change in the number of revolutions, in other words, a continuous recording area that does not require a change in the number of revolutions, is enlarged. In addition to the above, the region where the logical address value is smaller has a higher disk rotation speed, so that the rotation waiting time becomes shorter, and the access time can be shortened, which is convenient.

This is because, when a user newly starts using a disk, the logical address value is used from the lower side, but since the entire disk is rarely used up, the access time becomes shorter as the user starts using the disk. User convenience can be improved.

[0090]

According to the disk-shaped recording medium of the first aspect, when continuous data such as video is recorded, ZCL is used.
The V method enables recording and reproduction with a high data transfer rate, and the ZCAV method enables high-performance recording and reproduction operations for computers, and these methods can be performed using a common disk. Therefore, user convenience is improved. Also,
As a manufacturer of discs, there is no need to deal with a plurality of discs, and discs that can be used for various purposes can be collectively manufactured, which can contribute to cost reduction. Further, since the present disk-shaped recording medium does not have a header portion by pits, it is easy to reduce the track pitch, and the storage capacity can be increased.

According to the disk-shaped recording medium of the second aspect, in addition to the above-mentioned effects, it is possible to sufficiently draw out the linear recording density performance of the disk-shaped recording medium and the disk recording / reproducing apparatus, and to increase the disk storage capacity. It can be further increased.

According to the disk-shaped recording medium of the third aspect, the data use efficiency can be improved and the disk storage capacity can be increased.

According to the disk recording / reproducing apparatus of the fourth aspect, in the case of a computer application, an apparatus capable of performing a recording / reproducing operation with high access performance by the ZCAV system can be realized at a low cost. Since the recording medium can perform recording and reproduction even in an apparatus using the ZCLV method, complete compatibility is realized between apparatuses using different rotation control methods.

Here, in the ZCAV system,
Since a reference clock for recording / reproduction is generated in correspondence with a wobble frequency extracted at a different frequency for each zone, there is no need to provide a clock generation circuit serving as a reference for recording / reproduction for each zone as in the related art. Since the light beam is actually obtained corresponding to the traced area on the disk, the generation of the reference clock for recording and reproduction can be realized with a simple configuration. Further, the control of the light beam power for recording or reproduction, which is necessary because the linear velocity changes according to the radial position of the disk, can be realized with a simple configuration based on the wobble frequency.

According to the disk recording / reproducing apparatus according to the fifth aspect, an apparatus capable of performing recording / reproducing at a high data transfer rate by the ZCLV method can be realized at low cost in an application for recording continuous data such as video. Since the disk-shaped recording medium recorded by the device can be recorded and reproduced even by a device using the ZCAV system, complete compatibility is realized between devices having different rotation control systems.

Here, in the apparatus of the ZCLV system,
Since rotation control is performed by changing the rotation speed so that the wobble frequency is constant in each zone, it is not necessary to use a rotation sensor such as a rotary encoder as a rotation detection signal as in the past, and the light beam actually traces. Since a wobble signal for rotation control corresponding to the area on the disk is obtained, rotation control at a constant linear velocity can be realized with a simple configuration.

According to the disk recording / reproducing apparatus of the sixth aspect, when one kind of disk-shaped recording medium is used to record continuous data such as video, high-speed recording / reproducing can be performed by the ZCLV method. At the same time, in the case of a computer application, a recording and reproducing operation with high access performance can be performed by the ZCAV method, and the user can select and execute each of these methods according to the purpose of use, thereby improving convenience.

According to the disk recording / reproducing apparatus of the present invention, a reference clock for recording or reproduction is generated from a wobble signal extracted from a disk-shaped recording medium, so that a reference clock generating circuit can be used in the ZCAV system and the ZCLV system. Can be shared, which can contribute to cost reduction.

According to the disk recording / reproducing apparatus of the present invention, the rotation control information can be obtained from the disk even in the ZCAV system. It can be simplified without using it. Further, in a disk recording / reproducing apparatus that selectively uses the ZCAV method and the ZCLV method, the rotation control means can be shared and can be simplified.

According to the disk recording / reproducing apparatus of the ninth aspect, by using a disk in which the value of the physical address information sequentially increases from the outer peripheral side to the inner peripheral side of the disk, the data transfer in the ZCAV system is performed. A continuous logical address space is allocated to the groove and the land for the zone with the same speed, and the data transfer speed can be improved in an area with a smaller logical address value. become,
This is to improve user convenience. Also, ZC
In the LV system, in particular, in a recording / reproducing operation using a continuous logical address space of video information or the like, an access operation over a zone involving a change in the disk rotation speed can be reduced, and the average transfer speed can be further increased. be able to.

Further, by using a disk in which the value of the physical address information sequentially increases from the disk inner circumference toward the outer circumference, in the ZCLV method, the disk is used from the inner circumference where the rotation waiting time is short. , The access time becomes shorter as the user starts to use, and the convenience for the user can be improved.

According to the disk recording / reproducing apparatus of the tenth aspect, it is possible to omit the switching from the groove to the land or the switching from the land to the groove for the recording / reproducing operation across the zones, The time required for switching can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an area form of a disc-shaped recording medium according to Embodiments 1 and 2 of the present invention.

FIG. 2 is an enlarged schematic diagram showing an area form of a disk-shaped recording medium according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing a further enlarged area form of the disc-shaped recording medium according to the first embodiment of the present invention.

FIG. 4 is a data configuration diagram showing a sector configuration of a disk-shaped recording medium according to Embodiments 1 and 2 of the present invention.

FIG. 5 is a characteristic diagram of a disk rotation speed and a wobble frequency in zone units at the time of recording and reproduction when the disk-shaped recording medium according to the first and second embodiments of the present invention is used in the ZCAV system.

FIG. 6 is a characteristic diagram of a disk rotation speed and a wobble frequency in zone units at the time of recording and reproduction when the disk-shaped recording medium according to the first and second embodiments of the present invention is used in the ZCLV method.

FIG. 7 is an enlarged schematic diagram showing an area form of a disk-shaped recording medium according to a second embodiment of the present invention.

FIG. 8 is a schematic diagram showing a further enlarged area form of a disk-shaped recording medium according to Embodiment 2 of the present invention.

FIG. 9 is a schematic diagram showing, in an enlarged manner, a region form of another embodiment of the disc-shaped recording medium according to the first embodiment of the present invention.

FIG. 10 is a schematic diagram showing a region form of another embodiment of the disc-shaped recording medium according to the second embodiment of the present invention in an enlarged manner.

FIG. 11 is a configuration diagram showing a disk recording / reproducing apparatus according to Embodiment 3 of the present invention.

FIG. 12 is a configuration diagram showing a laser drive circuit of a disk recording / reproducing apparatus according to Embodiments 3 and 4 of the present invention.

FIG. 13 is a configuration diagram showing a clock generation circuit of a disk recording / reproducing apparatus according to Embodiments 3 and 4 of the present invention.

FIG. 14 is a flowchart illustrating a recording operation flow of a disk recording / reproducing apparatus according to Embodiments 3 and 4 of the present invention.

FIG. 15 is a flowchart illustrating a reproducing operation flow of the disk recording / reproducing apparatus according to Embodiments 3 and 4 of the present invention.

FIG. 16 is a configuration diagram showing another disk recording / reproducing apparatus according to Embodiment 3 of the present invention.

FIG. 17 is a configuration diagram showing a disk recording / reproducing apparatus according to Embodiment 4 of the present invention.

FIG. 18 is a configuration diagram showing a rotation control circuit of a disk recording / reproducing apparatus according to Embodiment 4 of the present invention.

FIG. 19 is a diagram for explaining assignment of logical addresses to physical addresses of a disk recording / reproducing apparatus according to Embodiment 5 of the present invention.

FIG. 20 is a diagram for explaining another embodiment of assigning a logical address to a physical address of the disk recording / reproducing apparatus according to the fifth embodiment of the present invention.

FIG. 21 is a diagram for explaining assignment of logical addresses to physical addresses of a disk recording / reproducing device according to a sixth embodiment of the present invention.

FIG. 22 is a schematic diagram showing a ZCAV type disk form in the related art.

FIG. 23 is an enlarged schematic view showing a disk form according to a conventional technique.

FIG. 24 is a schematic diagram further enlarging the vicinity of a header in a disk form according to a conventional technique.

FIG. 25 is a data configuration diagram showing a sector configuration in a conventional disk format.

FIG. 26 is a data frequency characteristic diagram in zone units at the time of recording / reproducing using a disk form according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 magneto-optical disk 2, 12 sector 2a, 12a sector boundary 3, 13, 3a, 13a groove 13b land 20 spin motor 21, 41 laser drive circuit 22 optical head 23 RF amplifier 24 servo control circuit 25, 43, 51 wobble detection circuit 26, 42, 52 Rotation control circuit 27 Address detection circuit 28 Reproduction data processing circuit 29, 44 Clock generation circuit 30 Recording data processing circuit 31 Magnetic head drive circuit 32 Magnetic head 33 Terminal 34 Host interface 35, 45, 53 Controller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/12 G11B 20/12

Claims (10)

[Claims] 1. A groove having a spiral or concentric groove, a groove to be followed by a light beam is divided into a plurality of zones in a radial direction, and physical address information and sector boundary information are recorded by wobbling the groove. The wobble frequency of the physical address information obtained when rotating at a constant angular velocity is constant in each zone and increases toward the outer peripheral zone, and recording data is arranged on a groove or a land according to sector boundary information. A disk-shaped recording medium characterized by being processed. 2. The disk-shaped recording medium according to claim 1, wherein the number of sectors per revolution when the sector length is a predetermined length includes a zone that is not a positive integer. 3. The disk-shaped recording medium according to claim 1, wherein recording data is arranged in a groove at a zone boundary. 4. A disk recording / reproducing apparatus for performing recording / reproducing using the disk-shaped recording medium according to claim 1, wherein a rotation control means for rotating the disk-shaped recording medium at a constant rotation speed; Reference clock generating means for generating a reference clock corresponding to a wobble frequency from physical address information; recording control means for recording recording data on a groove or a land of a disk-shaped recording medium based on the reference clock; A reproduction control means for reproducing recorded data on a groove or a land of a disk-shaped recording medium based on a clock. 5. A disk recording / reproducing apparatus for performing recording / reproducing using the disk-shaped recording medium according to claim 1, wherein the wobble frequency from the physical address information is rotated so as to be constant in each zone. Rotation control means for performing recording, recording control means for recording recording data on a groove or a land of a disk-shaped recording medium based on a fixed reference clock, and on a groove or land of a disk-shaped recording medium based on a fixed reference clock And a reproduction control means for reproducing the recorded data. 6. A disk recording / reproducing apparatus for performing recording / reproducing using the disk-shaped recording medium according to claim 1, wherein a first rotation control means for rotating the disk-shaped recording medium at a constant rotational speed. A second rotation control means for rotating the wobble frequency from the physical address information so as to be constant in each zone; a rotation control switching control means for switching between the first rotation control means and the second rotation control means; Reference clock generating means for generating a reference clock corresponding to the wobble frequency from the information; and when the first rotation control means is selected, recording data on a groove or a land of a disc-shaped recording medium based on the reference clock. Is recorded, and when the second rotation control means is selected, on the groove of the disk-shaped recording medium or on the basis of a constant reference clock. Recording control means for recording the recording data on the land; and when the first rotation control means is selected, reproducing the recording data on the groove or the land of the disk-shaped recording medium based on the reference clock, and A disk recording / reproducing apparatus comprising: a reproducing control unit that reproduces recorded data on a groove or a land of a disk-shaped recording medium based on a fixed reference clock when the rotation control unit is selected. 7. The disk recording / reproducing apparatus according to claim 4, wherein the reference clock generating means is shared by the recording control means and the reproduction control means. 8. The apparatus according to claim 4, wherein said rotation control means includes a programmable frequency dividing means for generating a reference frequency corresponding to rotation control information having a different frequency for each zone obtained from the disk-shaped recording medium. Or claim 6
A disc recording / reproducing apparatus according to claim 1. 9. An address conversion means for converting a given logical address into physical address information of a groove or a land, wherein said address conversion means converts a given logical address in a continuous ascending order into a groove for each zone, 7. The disk recording / reproducing apparatus according to claim 4, wherein the values are assigned so that the value of the physical address information is sequentially increased in the order of lands or the order of lands and grooves. 10. The disk recording / reproducing apparatus according to claim 9, wherein the address conversion means assigns the order of the groove and the land so that the order is changed for each adjacent zone.