JP2002025069A - Recording medium, recorder and reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the capacity of a test area and to record test patterns taking crosstalks into consideration. SOLUTION: The test areas consisting of at least four tracks are formed by each of zones in such a manner that the test patterns may be recorded in grooves G1 and the crosstalk patterns in adjacent lands L1 and L2 and that the test patterns may be recorded in the lands L2 and the crosstalk patterns in the adjacent grooves G1 and G2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a recording medium, a recording device, and a reproducing device.

[0002]

2. Description of the Related Art In a disk drive device, for example, adjustment of a focus bias or reproduction at the time of reproduction is performed so that recording and reproduction can be performed on a loaded disk-shaped recording medium in a stable state. The laser power can be adjusted. Such adjustment is performed as a calibration process based on, for example, a test pattern recorded in a predetermined area of the disc.

[0003]

Recently, it has been practiced to increase the recording capacity of a disk by reducing the track pitch and increasing the recording density. Therefore, the above adjustment needs to be performed in consideration of signal leakage (crosstalk) from an adjacent track.
In particular, when a recording area is formed by a land track and a groove track, it is necessary to adjust the land track and the groove track.

[0004] Therefore, it is desired to perform the adjustment in consideration of the crosstalk after reducing the amount of the recording area used for the above adjustment.

[0005]

In view of such circumstances, the present invention provides a recording medium in which a recording area is formed by groove tracks and land tracks, and the recording area is divided into zones. A first area on which a predetermined pattern can be recorded, the first area being composed of the groove track and land tracks adjacent to both sides of the groove track, and a land area adjacent to both sides of the land track and the land track of the first area. The recording medium is provided with a test area including a groove area to be recorded and a second area in which the predetermined pattern can be recorded.

In addition, a recording area is formed by the groove track and the land track, and the recording area is divided into zones, and each zone includes a groove track and land tracks adjacent to both sides of the groove track. When a recording medium including one area and a second area including a land track of the first area and a groove track adjacent to both sides of the land track is loaded, the second area is provided for each zone. The recording apparatus is provided with recording control means capable of recording a predetermined pattern in one area and the second area.

In addition, a recording area is formed by the groove track and the land track, and the recording area is divided into zones, and a test area in which a test pattern for performing a calibration is recorded is formed for each zone. Means for accessing the test area in which a test pattern corresponding to the calibration to be executed is recorded when the recording medium is loaded, and recording in the test area accessed by the access means. The playback apparatus is provided with an execution control unit capable of causing the calibration to be executed based on the test pattern.

According to the present invention, the capacity of the test area can be minimized, and a test pattern can be recorded in consideration of crosstalk. Further, the calibration corresponding to the crosstalk can be performed by the test pattern recorded in this manner.

[0009]

Embodiments of the present invention will be described below in the following order. 1. 1. MSR method 2. Disk configuration 3. Disk drive device configuration Test area 5. Calibration

[0010] 1. MSR Method First, a method for reproducing a magneto-optical disk based on the MSR method will be described with reference to FIG. Magnetic super-resolution reproduction method (magnetic super-resolution: MSR: Magnetically induced Sup
er Resolution) is a technology that can read recorded information in an area smaller than a laser spot using magnetic films having different temperature characteristics. That is, with respect to a medium (MSR medium) having a recording area in which magnetic films having different temperature characteristics have a two-layer structure, high-density recorded information is read without reducing the laser spot diameter. be able to.

An MSR (magnetic super-resolution) reproducing method will be described with reference to FIG. FIG. 15A shows a recording track Dt on which a recording mark M is formed and a laser spot SP irradiated thereon, and FIG. 15B shows a part of a cross section of the magneto-optical disk. To obtain the MSR effect, see FIG.
As shown in (b), the magneto-optical disk is a layer having different magnetic properties depending on the temperature.
It is necessary to have a reproduction layer. The reproduction layer is a layer that functions as a mask that covers the recording mark M from the laser spot SP during reproduction. The recording layer is a layer that holds a recording signal, that is, information as a recording mark M, as the direction of magnetization. The intermediate layer is a layer that controls the coupling between the reproducing layer and the recording layer.

At the time of reproduction, by applying a magnetic field from the outside, the magnetization direction of the reproduction layer is made uniform, thereby masking the recording layer (front mask). Here, when heat is applied to the disk by the laser spot SP, a portion of the laser spot SP near the intermediate temperature of the heat distribution,
The magnetization information of the recording layer, that is, the magnetization direction of the recording mark M is transferred to the reproduction layer. By observing the direction of the magnetization transferred to the reproducing layer, it is possible to read the recording mark M recorded at high density even with the laser spot SP having a large spot diameter. In a portion where the heat distribution due to the laser spot SP is at a high temperature, the reproducing layer and the recording layer are magnetically isolated, and the reproducing layer masks the recording layer by an external magnetic field (rear mask). The use of such an MSR technique enables, for example, twice or more high-density recording / reproduction even if the beam spot diameter is the same as that of the related art. For example, recording on a magneto-optical disk such as the disk 90 of the present embodiment is possible. The capacity can be greatly increased.

2. 1. Disk Configuration FIG. 1 is a view for explaining the structure of a plurality of zones divided in the radial direction on the disk shown in FIG.
The center portion of the disc 90 is a so-called clamping area and a clearance area.
In the area from 7.00 mm to 62.50 mm, a zone format is defined as shown in FIG.

That is, the lead-in zone when viewed from the outer peripheral side,
An outer control truck SFP zone, an outer manufacturer zone, a user zone, an inner manufacturer zone, an inner control truck SFP zone, a transition zone, a PEP zone, and a reflective zone.

A zone in which a user records and reproduces various data as main data is a user zone. As shown in the figure, this user zone is divided into zones # 0 to # 23.
A so-called zone CAV method is adopted, which is divided into four zones and performs recording and reproduction with a different clock for each zone, thereby minimizing the recording density on the inner and outer circumferences of the disk. In zones # 0 to # 23 formed in the user zone, a buffer area is formed first, and then a data area in which user data is recorded is formed. For example, a first buffer area, a test area, and a second buffer area are formed following a spare area provided for replacement of a data area.

The outer control track SFP zone and the inner control track SFP zone are preformat areas in which system information and recording information are recorded in advance. The outer manufacturer zone and the inner manufacturer zone are zones including a guard band, a test zone for a manufacturer, and a test zone for a drive.

The PEP zone is a zone formed so that only information reading can be performed in a state where the tracking state is not restricted. For example, a pit mark is formed in a radial direction to form a bar code in a circumferential direction. A reflection pattern in the shape of a circle is formed. And in this PEP zone, P
Disk information serving as one of the management information is recorded as EP data.

The radial position range in which the zones from the lead-in zone to the reflective zone shown in FIG. 1 are arranged is as shown in FIG.

The disc of this embodiment adopts a land / groove recording method, that is, as schematically shown in FIG. 3, a groove G formed on the disc is used.
In addition, the land L is also handled as a recording track. Therefore, as shown, a recording mark M as information to be recorded is formed on the groove G and the land L. In the present embodiment, by providing at least four tracks (two grooves, two lands) for each zone, a pattern for performing calibration corresponding to crosstalk is recorded for both the land track and the groove track. And the capacity of the test area can be made as small as possible.

3. FIG. 4 is a block diagram of a disk drive device corresponding to the disk 90 described above. The inserted disk 90 is chucked with respect to the spindle motor 1 by a loading mechanism (not shown). And disk 90
Is rotated by the spindle motor 1 during data recording / reproduction.

The optical head 2 irradiates the disk 90 with a laser beam at the time of recording / reproducing.
It is a part for reading the reflected light information from the camera. For this purpose, the optical head 2 is equipped with a laser diode 5 as a laser output unit, an optical system 6 such as a polarization beam splitter, an objective lens 3 as a laser emission site, a photodetector 7 for detecting reflected light, and the like. Further, an RF matrix amplifier 8 for performing various arithmetic processing on information from the photodetector 7 to obtain necessary signals is also mounted.

Although detailed description is omitted, in the sector format of the disk 90, the header information of the sector by the emboss pit is a sum signal R +. Also,
A signal reproduced by, for example, the MSR method from an area which is a recording / reproducing area in which data can be recorded / reproduced as a magneto-optical area is a difference signal R-.

The objective lens 3 is held by a biaxial mechanism 4 so as to be displaceable in the radial direction of the disk 90 and in the direction of coming into contact with and away from the disk 90. The entire optical head 2 is moved by the slide mechanism 9 in the radial direction of the disk 90. It is possible to move to. The status of the optical head 2 moved by the slide mechanism 9 is detected by the servo processor 25. Although the actual mechanism is not shown, the servo processor 25 is attached to a fixed portion (the inner peripheral side of the medium) of the optical head 2 in the movable range of the optical head 2 on the spindle motor 1 side. On the other hand, a linear scale is attached to the movable part of the optical head 2 in parallel with the servo processor 25. As a result, when the optical head 2 is moved, the phases from the A phase and the B phase of the servo processor 25 are mutually 90 degrees.
A rectangular wave shifted by a degree is output. Such a detection signal is supplied to the servo processor 26.

The power and emission timing of the laser output from the laser diode 5 are controlled by the laser power controller 1.
Controlled by 0.

A bias magnet 11 is disposed at a position facing the optical head 2 with the disk 90 interposed therebetween.
The bias magnet 11 performs an operation of applying a bias magnetic field to the disk 90 when recording / erasing data.

From the reflected light information read from the photodetector 7, a signal required by the RF matrix amplifier 8 is extracted. That is, information used for various operation controls such as a reproduction RF signal and a servo operation to be actual reproduction data is extracted. The reproduced RF signal is amplified,
Equalizing processing, binarization processing, and the like are performed, and digital data forms of “1” and “0” corresponding to recording pits are obtained. In this case, for example, a Viterbi decoding method is used. The read data DTR is supplied to the encoder / decoder 1
5 is supplied.

The system controller 16 is formed of a microcomputer, which controls the operation of the entire recording / reproducing apparatus and serves as a portion for transmitting / receiving recording / reproducing data to / from the host computer via the interface unit 17. Further, the system controller 16 can execute a process related to retry control when an address mark described later cannot be detected. Read data D from RF processing unit 14
TR is decoded in a functional block serving as a decoder in the encoder / decoder section 15, and data is reproduced. The reproduced data is EC
The data is sent to the host computer via the C unit 18, the buffer controller 19, and the interface unit 17. EC
The C section 18 extracts an error correction added to the reproduction data, performs an error correction process, and determines an error of the reproduction data. When the determination result becomes “OK”, the data is accumulated in the buffer memory 20 by the buffer controller 19, and when the predetermined data unit is accumulated, the data is read out by the buffer controller 19 and output to the interface unit 17. You. The PLL circuit 30
A required clock is generated based on the read data DTR output from the processing unit 14 and supplied to the encoder / decoder unit 15. Therefore, the encoder / decoder unit 15 performs a decoding process and the like based on the clock from the PLL circuit 30. The jitter amount detection unit 31 can determine the amount of jitter based on the clock and the phase error signal from the PLL circuit 30 and the like.

When data transmitted from the host computer via the interface unit 17 is recorded on the disk 90, signal processing is performed along a path reverse to the above-described reproduction operation. That is, the recording data input via the interface unit 17 is accumulated in the buffer memory 20 by the buffer controller 19, and is supplied to the ECC unit 18 when a predetermined unit of data is accumulated. Then, the recording data to which the error correction code has been added in the ECC unit 18 is subjected to an encoding process in a functional block as an encoder in the encoder / decoder unit 15 and is encoded into the recording data DTW according to the recording format of the disk 90. . Then, the recording data DTW is supplied to the laser power controller 10.

As described above, at the time of recording, an external magnetic field for recording is generated by the bias magnet 11, but the laser irradiation by the optical head 2 causes the data "1" to be recorded.
It is turned on / off according to “0”. That is, the laser power controller 10 controls the light emitting operation of the laser diode 5 on / off according to the pulse as the recording data DTW, so that the magnetic field pit recording based on the recording data DTW is performed.

When such a recording / reproducing operation is performed, it is necessary to properly control the laser irradiation position, spot diameter, laser power, the rotation speed of the spindle motor 1, and the like. Therefore, various servo systems are configured.

As signals used for the operation of the servo system, RF
In the matrix amplifier 8, the tracking error signal TE and the focus error signal F are obtained from the output of the photodetector 7.
E, slide error signal SLE, light amount signal (sum signal) I
SUM and the like are extracted. These signals are supplied to the servo processor 26.

The servo processor 26 outputs these signals,
Various servo drive signals (a focus drive signal, a focus drive signal, an access command, an access command, a start / stop command of the spindle motor 2, etc.) from the system controller 16.
A tracking drive signal, a slide drive signal, and a spindle drive signal are generated, and focus servo, tracking servo, slide servo, and spindle servo are executed.

The focus servo is an operation for controlling the laser beam output from the optical head 2 so as to focus on the recording surface of the disk 90 rotated by the spindle motor 1. In order to obtain the focus error signal FE, a four-divided detector is prepared in the photo detector 7, and focus error information is extracted by a so-called astigmatism method. That is, when the respective areas of the four-divided detector are A, B, C, and D, and the detectors that form a diagonal pair are A, D, and B, C, the RF matrix amplifier 8 calculates (A + D)-(B + C) And the result is used as the focus error signal FE. Note that R
In the F matrix amplifier 8, the calculation of A + B + C + D is also performed, and this becomes a sum signal ISUM which is information corresponding to the light amount.

The servo processor 26 performs a phase compensation process or the like on the focus error signal FE to generate a focus drive signal, and supplies the focus drive signal to the focus driver 22. The focus driver 22 applies power to the focus coil of the two-axis mechanism 3 according to the focus drive signal, whereby the objective lens 3
It is driven in the direction of coming and going. The movement of the objective lens 3 is controlled so that the focus error signal FE always becomes zero so that the focused state of the laser light is maintained.

Ideally, the point at which the focus error signal becomes zero and the point at which information can be reproduced most efficiently from the disk 90 (that is, the reproduction R
The points at which the amplitude of the F signal is maximum) should be the same, but in fact, these points deviate. The deviation is called a focus bias, and the servo system is configured to add a bias voltage corresponding to the focus bias to the focus error signal FE, so that the focus state becomes a point at which the amplitude of the reproduction RF signal becomes maximum. It is controlled to converge.

In order to realize such focus control, the objective lens 3 must be located at a position within the focus pull-in range. As is already known, the focus pull-in range is a range in which the focus error signal FE changes linearly. If the focus error range is not within this range, it is possible to correctly control the zero cross point of the focus error signal FE as an appropriate focus position. Can not. Therefore, at the time of start-up for executing the recording / reproducing operation, the focus search operation is performed. In this focus search operation, power is applied to the focus coil so that the objective lens is forcibly moved within the movable range.
Then, for example, when it is detected from the above-mentioned sum signal ISUM or the like that it is within the focus pull-in range, the focus servo is turned on.

The tracking servo is an operation for controlling the laser beam output from the optical head 2 to follow the track (groove) of the disk 90 rotated by the spindle motor 1. In order to obtain the tracking error signal TE, if the laser irradiation is of a three-spot type, a detector for side spots (E, F) is prepared in the photodetector 7 and the RF matrix amplifier 8 calculates EF. And the result is used as a tracking error signal TE.

The servo processor 26 generates a tracking drive signal by performing a phase compensation process or the like on the tracking error signal TE and supplies it to the tracking driver 23. The tracking driver 23 applies electric power to the tracking coil of the two-axis mechanism 3 according to the tracking drive signal, whereby the objective lens 3 is driven in the radial direction of the disk 90. The movement of the objective lens 3 is controlled so that the tracking error signal TE always becomes zero, so that the tracking state of the laser beam is maintained.

As in the case of the focus, the point where the tracking error signal TE becomes zero and the point where the information can be reproduced most efficiently from the disk 90 are deviated.
This deviation is called a tracking bias. Then, by configuring the servo system so as to add a bias voltage corresponding to the optimum tracking bias to the tracking error signal TE, the tracking state becomes equal to the reproduction R.
The control is performed so that the amplitude of the F signal converges to a point where the amplitude becomes maximum.

Next, the slide servo is a control in the disk radial direction similar to the tracking servo, but the laser output from the optical head 2 is moved by moving the entire optical head 2 within a range that cannot be followed by the tracking servo. This is an operation of irradiating a predetermined position of the disk 90 with light.

The slide error signal SLE is a signal corresponding to the deviation of the objective lens 3 from the center position in the track direction detected by the midpoint sensor in the optical head 2, and the servo processor 26 generates such a slide error signal. A slide drive signal in a direction in which SLE becomes zero is supplied to the slide driver 21. The slide driver 21 responds to such a slide drive signal and operates the slide mechanism 9.
To move the entire optical head 2. Of course, in a track jump operation such as an access operation, a slide drive signal is generated from the servo processor 26 in response to an instruction from the system controller 16, and the slide mechanism 9 is driven. The movement of the optical head 2 by the slide mechanism 9 is detected by the linear encoder 25 as described above and supplied to the servo processor 26.
That is, the 90-degree-shifted rectangular waves as the A-phase and the B-phase are supplied to the servo processor 26, and the servo processor 26 determines the amount of movement of the optical head 2 by checking the wave number and phase relationship of each rectangular wave. And the moving direction can be recognized. Further, by performing the slide drive control based on the same recognition, the optical head 2 can be moved to a desired position (for example, a position on the inner peripheral side of the disk).

The servo processor 26 also controls the rotation of the spindle motor 1. Spindle motor 1
Is driven by the spindle driver 12. The servo processor 26 outputs a spindle start / stop signal SPSB to the spindle driver 12 in response to a spindle start command from the system controller 16.

The spindle driver 12 starts the rotation of the spindle motor 1 in response to the spindle start / stop signal SPSB, and outputs a spindle lock signal SPLK to the servo processor 26 when the spindle motor 1 reaches a predetermined number of revolutions. Based on the spindle lock signal SPLK, the servo processor 26 and the system controller 16 can detect that the spindle motor 1 has actually reached the predetermined rotation speed after the spindle start command.

When receiving a spindle stop command from the system controller 15, the servo processor 26 outputs to the spindle driver 12 a spindle start / stop signal SPSB whose polarity is inverted from that at the start. The spindle driver 12 generates brake power (back electromotive force) for the spindle motor 1 in response to the spindle start / stop signal SPSB having a different polarity, and stops the spindle motor 1.

Further, the operation of the servo processor 26 includes controlling the laser output level to a constant level for the laser power controller 10 and controlling the laser output level based on an instruction (at the time of recording / reproduction) from the system controller 16. High level / low level switching is performed. Further, the servo processor 26 outputs a drive signal to the bias magnet driver 24 to generate the above-described erasing bias magnetic field and recording bias magnetic field in the bias magnet 11 during recording / erasing.

The memory 32 is configured as a work memory, and can store, for example, a jitter amount when performing power calibration of read power, an amplitude value when performing calibration of focus bias, and the like. . The temperature measuring unit 33 is capable of measuring, for example, the temperature near the surface of the disk 90 inside the housing of the disk drive device. In FIG. 4, the temperature information is shown near the system controller 16 for the sake of convenience. It is supplied.

4. Test Area FIGS. 5A and 5B show four tracks (grooves G1, G2,
FIG. 3 is a schematic diagram illustrating a part of a test area formed by lands L1 and L2) and an example of an adjustment pattern recorded in the test area. As shown in FIG. 5A, for example, when a test pattern is recorded on the track in the groove G1, a pattern for crosstalk is recorded on the lands L1 and L2 which are adjacent tracks. To do it. That is, the groove G1, land L1, and land L2 on which recording is performed in FIG. 5A are the first areas of the test area. In the state where the recording pattern is recorded in this manner, the laser head scans the groove G1 with the optical head 2 so that the test pattern can be read.
Crosstalk can be measured by a crosstalk pattern of the land L1 and the land L2. Thus, an adjustment result corresponding to the groove G can be obtained.

Also, as shown in FIG.
For example, when the track test pattern is recorded on the land L2, the groove G which is the adjacent track is recorded.
1. A pattern for crosstalk is recorded in the groove G2. That is, the land L2, the groove G1, and the groove G2 on which recording is performed in FIG.
Is the second area of the test area. Then, in a state where the recording pattern is recorded, the laser head scans the land L2 with the optical head 2 so that the test pattern can be read.
Crosstalk can be measured by a crosstalk pattern formed by the grooves G1 and G2. Thereby, an adjustment result corresponding to the land L can be obtained.

As described above, in this embodiment, the test area is formed by, for example, four tracks. However, for example, since the disk 90 is rewritable, as shown in FIG. After the pattern is recorded and the adjustment corresponding to the groove is performed, the data is rewritten, and the rewriting is performed as shown in FIG. 5B to perform the adjustment corresponding to the land. it can. Further, as shown in FIGS. 5 (a) and 5 (b), a crosstalk pattern is recorded on the land L1 and the groove G2 in any case. The groove G1 and the land L2 are sufficient.

FIG. 6 shows an example of calibrating the laser power at the time of reproduction, for example, as a test pattern. FIG. 6A shows a pattern for calibrating the laser power corresponding to the groove. 6
(B) shows a pattern for calibrating the laser power corresponding to the land. As shown in the figure, "2T", "2T", and "4T" are recorded as test patterns recorded on the groove G1 or the land L2, and "6T" is recorded as a crosstalk pattern.

The test patterns "2T" and "2T"
The reason why "4T" is adopted is that, when this pattern is reproduced, the laser power when the jitter is optimized is almost the same as the laser power when the bit error rate is optimized. It is said that it is possible.
When reading is performed while changing the laser power (hereinafter, referred to as sweep) when executing the calibration, the rate of change becomes optimal compared to other patterns.

For example, when the rate of change is too small, the laser power is "x", the jitter is "y", and the constant "a" is obtained when "y = ax ² + b" obtained by quadratic approximation. Becomes too small, and it is difficult to read the optimum laser power. Conversely, if the rate of change is too large, it may be difficult to arrive at a solution. Therefore, inconvenience occurs in "2T" and "3T" having a small change rate or "6T" having a large change rate. For these reasons, test patterns “2T”, “2T”, “4
T "is preferred.

As a crosstalk pattern, "6
The reason why "T" is adopted is that the amplitude of the reproduced signal when this pattern is reproduced is large. Therefore.
When the laser power is swept, for example, when the spot diameter becomes large due to the defocus of the laser beam or the like, the leakage becomes large, so that the crosstalk pattern is optimized. Since the frequency characteristic is low in the peripheral portion of the spot diameter, for example, “2T”
Short marks such as "3T" are not suitable as crosstalk patterns because there is almost no leakage.

FIG. 7 shows an example in which, for example, calibration of a focus bias is performed as a test pattern. FIG. 7A shows a pattern in which calibration of a focus bias corresponding to a groove is performed.
FIG. 7B shows a pattern for calibrating the focus bias corresponding to the land. As shown, the test pattern recorded on the groove G1 or the land L2 is “3T”, and the crosstalk pattern is “6T” as in the example shown in FIG.
T "is recorded.

For example, the reason why "3T" is adopted as a test pattern is that when this "3T" pattern is read out and data is decoded by, for example, a Viterbi decoding method, a stable and consistent value is obtained. It is said that it can be. In addition, for example, when the reproduction power is not optimized, if the focus bias is calibrated using a long mark such as “6T”, the signal level tends to be saturated.

The pattern to be recorded in the test area has been described with reference to FIGS. 6 and 7. As described with reference to FIG. 1, in this embodiment, the user zone is divided into 24 zones. Therefore, 24 test areas are formed corresponding to the user zones. Therefore, for example, each pattern as shown in FIGS.
Recording can be made at a required radius position as needed, and various adjustments can be made. Further, as described above, since the test area of the disk 90 can be formed by, for example, four tracks, various adjustments can be performed with a minimum necessary capacity consumption.

5. Calibration FIG. 8 is a flowchart illustrating an example of processing steps in a case where calibration is performed in a disk drive device with a disk loaded.
When it is determined that the disk 90 is loaded in the disk drive device (S001), a calibration process is executed (S002). This calibration processing includes, for example, calibration of focus bias (S0021) as shown in the flowchart of FIG.
Calibration of read power (S0022), M
O gain calibration is performed (S0023). In this figure, steps S0021, S002
2 and S0023, three types of calibration are performed. However, in the calibration processing S002, for example, write power calibration or identification information of a sector which is a data recording unit may be used. Various adjustments and the like for optimizing the reading are performed. When these calibrations are completed, as shown in FIG. 8, the state shifts to a state where normal operations, that is, processing such as recording and reproduction can be executed (S003). When the process shifts to the normal process in this way, it is determined whether or not the temperature near the disk surface of the disk 90 has become equal to or higher than the temperature specified in the disk drive device (S004). Then, when it is determined that the temperature has become equal to or higher than the specified temperature, calibration is performed (S002).

FIG. 10 is a flowchart for explaining an example of the processing steps executed by the system controller 16 when the focus bias is calibrated (S0021). When the calibration of the focus bias is started, for example, a seek is performed to a test area which is the closest to the current position of the optical head 2 (S101). Then, the focus bias value is swept from [current value−20%] to [current value + 20%] (S
102), the maximum amplitude of the difference signal is obtained (S10).
3). For example, in FIG. 11, when the vertical axis direction is the amplitude and the horizontal axis direction is the focus bias value, the maximum amplitude value P is obtained by sweeping the focus bias value. And the maximum amplitude P
Determines whether the value is within a predetermined range defined by the disk drive device (S104). If it is determined that the value is within the predetermined range, the focus when the acquired maximum amplitude value P is obtained is determined. The bias value is set as an optimal focus bias value (S105). When it is determined that the acquired amplitude maximum value P is not within the predetermined range, the count value (i) of the retry counter is counted up (S106), and the count value (i) is further defined in the disk drive. It is determined whether or not the number is greater than the number n of retries (S10).
7). When it is determined that the count value (i) is smaller than the number of retries n, the process returns to step S101,
The maximum amplitude value P is obtained again. If it is determined that the count value (i) is larger than the number n of retries, the process proceeds to error processing (S108).

Although the processing steps shown in this figure do not show a step of recording a test pattern in the test area, for example, if no test pattern is recorded in the test area, the test pattern is recorded after the step S101. To write. In this case, for example, a processing step for either a land track or a groove track is shown. Therefore, for example, when the calibration shown in FIG. 10 is performed on the land track, the test pattern corresponding to the groove is recorded next, and the calibration is performed on the groove track in the same process. That is, the set values for the land track and the groove track are obtained in one calibration.

FIG. 12 is a flow chart for explaining an example of processing steps executed by the system controller 16 when calibrating the read power (S0022). When the calibration of the read power is started, first, for example, a seek is performed on a test area formed on the outer peripheral side of the disk 90 (S201).
Then, the read power is changed from [current value−30%] to [current + 3
0%] (S202), and the minimum jitter value is obtained (S203). For example, in FIG. 13, when the vertical axis direction is the jitter and the horizontal axis direction is the read power value, the minimum jitter value B is determined by sweeping the read power value. Hereinafter, the minimum value of the jitter on the outer peripheral side is referred to as “B1”. Then, it is determined whether the minimum jitter value B1 is within a predetermined range defined in the disk drive device (S20).
4) If it is determined that it is within the predetermined range, the read power when the minimum jitter value B is detected is set as the optimum read power on the outer peripheral side (S205). When it is determined that the obtained minimum jitter value B1 is not within the predetermined range,
The count value (i1) of the retry counter is counted up (S206), and it is further determined whether or not the count value (i1) is larger than the number n of retries specified in the disk drive device (S20).
7). If it is determined that the count value (i1) is smaller than the number n of retries, the process returns to step S201, and the outermost optimum read power is calculated again. If it is determined that the count value (i1) is larger than the number n of retries, the process proceeds to error processing (S
208).

After finding the optimum read power on the outer peripheral side,
For example, a seek is performed on a test area formed on the inner peripheral side of the disk 90 (S209). Then, step S2
09 to step S216, step S20
From step 2, the optimum read power on the inner peripheral side is obtained in the same manner as in step S208. That is, a seek is performed on the test area formed on the outer peripheral side of the disk 90 (S2).
09), the read power is changed from [current value -30%] to [current +3].
0%] (S210), and the minimum jitter value B2 on the inner circumference side is acquired (S211). Then, it is determined whether or not the minimum jitter value B2 is within a predetermined range defined in the disk drive device (S212). When it is determined that the minimum jitter value B2 is within the predetermined range, the minimum jitter value B2 is determined. The read power when detected is set as the optimum read power on the inner peripheral side (S213). Then, the two read power values obtained on the outer circumference side and the inner circumference side are linearly approximated to obtain an optimum read power value corresponding to the radial position of the disk 90 (S214). As shown in FIG. 14, for example, as shown in FIG. 14, when the read power is set in the vertical axis direction and the disc radius is set in the horizontal axis direction, the minimum value B1
And the read power corresponding to the minimum jitter value B2 on the outer peripheral side are linearly approximated.

If it is determined in step S212 that the minimum jitter value B2 is not within the predetermined range, the count value (i2) of the retry counter is counted up (S215), and further, the count value (i2) is set to the value of the disk. It is determined whether the number is greater than the number of retries n specified in the drive device (S216). If it is determined that the count value (i2) is smaller than the number n of retries, the process returns to step S209, and the optimum read power on the inner peripheral side is obtained again. If it is determined that the count value (i2) is larger than the number n of retries, the process proceeds to error processing (S21).
7).

Even when the calibration of the read power is executed as shown in the flowchart of FIG. 12, if the test pattern is not recorded in the test area as in the case described above, step S2 is executed.
After 01, the test pattern is written. Then, calibration is performed for the land track and the groove track.

FIG. 14 shows the gain (M
9 is a flowchart illustrating an example of processing steps executed by the system controller 16 when performing calibration (S0023) of O gain). When the calibration of the MO gain is started, first, for example, a seek is performed on a test area formed on the outer peripheral side of the disk 90 to read out a test pattern (S30).
1) The gain of the amplitude of the read signal is adjusted (S302). Then, it is determined whether or not the read amplitude has reached a predetermined value defined in the disk drive device (S303). If it is determined that the read amplitude has reached the predetermined value, the value is set to the optimum gain on the outer peripheral side. (S304). If it is determined that the amplitude of the read signal has not reached the predetermined value, the count value (i1) of the retry counter is counted up (S305).
Further, it is determined whether or not the count value (i1) is larger than the number n of retries specified in the disk drive device (S306). If it is determined that the count value (i1) is smaller than the number n of retries, the process returns to step S301, and the optimum MO gain on the outer peripheral side is calculated again. In addition, the count value (i
If 1) is determined to be greater than the number of retries n,
The process proceeds to error processing (S307).

After obtaining the optimum MO gain on the outer circumference side, seeking is performed on a test area formed on the inner circumference side of the disk 90, for example (S308), and the gain adjustment of the amplitude of the read signal is performed (S309). ). Then, it is determined whether or not the amplitude of the read signal has reached a predetermined value defined in the disk drive device (S31).
0), when it is determined that the predetermined value has been reached, the value is set as the optimum gain on the inner circumference side (S311). And
The two gains obtained on the outer circumference side and the inner circumference side are linearly approximated to obtain an optimum gain corresponding to the radial position of the disk 90 (S312).

Incidentally, even when the calibration of the gain from the disk 90 is executed as shown in the flow chart of FIG. 14, when the test pattern is not recorded in the test area as in the case described above,
After step S301, a test pattern is written. Then, calibration is performed for the land track and the groove track.

[0067]

As described above, according to the present invention, as a test area for performing various calibrations on a recording medium, each zone includes a groove track and a land track adjacent to the groove track. A first area in which the first pattern can be recorded, and a second area in which a land track of the first area and a groove track adjacent to the land track are provided, and the predetermined pattern can be recorded. When the recording medium is loaded in the disk drive, calibration can be performed in consideration of crosstalk, and the capacity of the test area can be minimized.

Further, the recording apparatus can record a predetermined pattern for calibrating, for example, focus bias and read power in the test area, for example. For example, by recording this test pattern when the recording medium is shipped, the calibration can be efficiently performed when the recording medium is used after the shipment, for example. Further, the predetermined pattern can be recorded every time the calibration is performed, and the first or second test pattern can be recorded as a series of operations for performing the calibration. In addition, since different types of test patterns can be recorded for each zone, it is possible to select and record a test area that is optimal for the calibration to be performed.

Further, when performing the calibration, the test pattern corresponding to the calibration to be executed is recorded, for example, by moving to an arbitrary test area closest to the current position of the reading means. Since it is good, access efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a zone configuration of a disk according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a zone layout of a disk according to an embodiment.

FIG. 3 is an explanatory diagram of a land / groove recording method for a disk according to the embodiment;

FIG. 4 is a block diagram illustrating a configuration example of a disk drive device according to the present embodiment.

FIG. 5 is a diagram illustrating a configuration example of a test area.

FIG. 6 is an explanatory diagram of a pattern used for focus bias calibration.

FIG. 7 is an explanatory diagram of a pattern used for read power calibration.

FIG. 8 is a flowchart illustrating an example of a process transition for executing calibration.

FIG. 9 is a flowchart illustrating a transition of calibration to be performed.

FIG. 10 is a flowchart illustrating an example of focus bias calibration.

FIG. 11 is a diagram illustrating a relationship between a focus bias value and a difference signal amplitude.

FIG. 12 is a flowchart illustrating an example of read power calibration.

FIG. 13 is a diagram illustrating the relationship between jitter and read power.

FIG. 14 is a diagram illustrating a relationship between a disk radius and read power.

FIG. 15 is a flowchart illustrating an example of MO gain calibration.

FIG. 16 is an explanatory diagram of an MSR reproducing operation.

[Explanation of symbols]

Reference Signs List 1 spindle motor, 2 optical head, 3 objective lens, 4 axis mechanism, 5 laser diode, 7 photo detector, 8 RF matrix amplifier, 9 slide mechanism, 10 laser power controller, 11 bias magnet, 12 spindle driver, 14 RF processing unit , 15 encoder / decoder section, 16 system controller, 18 servo processor, 21 slide driver, 22 focus driver, 23 tracking driver, 24 bias magnet driver,
25 linear encoder, 31 jitter detector, 90 disc

Continued on front page F-term (reference) 5D029 JB18 JB42 JB50 PA08 WA27 5D044 BC06 CC04 DE03 DE12 DE45 DE99 GK18 5D090 AA01 BB10 CC01 CC14 CC18 DD01 EE03 EE20 FF05 GG10 JJ01 5D118 AA13 AA14 AA11 CA02 BB10

Claims (5)

[Claims] 1. A recording medium in which a recording area is formed by a groove track and a land track, and wherein the recording area is divided for each zone, wherein, for each zone, a land adjacent to both sides of the groove track and the groove track. A first area on which a predetermined pattern can be recorded, and a land track of the first area and groove tracks adjacent to both sides of the land track, and the predetermined pattern can be recorded. A recording medium comprising a test area comprising a second area that can be formed. 2. A recording area is formed by a groove track and a land track, and the recording area is divided into zones. Each zone includes a land track adjacent to the groove track and both sides of the groove track. When a recording medium having one area and a second area composed of a land track of the first area and a groove track adjacent to both sides of the land track is loaded, A recording apparatus comprising: recording control means for recording a predetermined pattern in one area and the second area. 3. The recording control means records a pattern for measuring crosstalk with an adjacent track on a land track of the first area, and records a pattern on a groove track of the second area with an adjacent track. 3. The recording apparatus according to claim 2, wherein a pattern for measuring crosstalk is recorded. 4. The recording apparatus according to claim 3, wherein the predetermined pattern is a pattern for adjusting a focus bias or a pattern for adjusting a laser power for reproduction. 5. A recording area is formed by a groove track and a land track, and the recording area is divided into zones, and a test area for recording a test pattern for performing calibration for each zone is formed. Means for accessing the test area in which a test pattern corresponding to the calibration to be performed is recorded when the recording medium is loaded, and recording in the test area accessed by the access means. An execution control unit that can execute calibration based on the test pattern being executed.