A method for accurately recording high resolution on high density tracks

Abstract

The application discloses a method for accurately performing high-resolution recording on a high-density track, S11: obtaining to-be-recorded data in a multi-ary form; S12: extracting a plurality of combination models; S13: recording the plurality of combination models on an optical disc to obtain first distortion data; S14: performing a recording compensation operation based on the first distortion data to obtain a plurality of mark correction amounts; S21: for each combination model, using a corresponding mark correction amount to perform compensation to obtain compensation data; and S22: based on a segmented laser control strategy, recording the compensation data on the optical disc in high resolution. The application obtains distortion data that may occur during actual recording in advance, performs a recording compensation operation based on the distortion data to obtain mark correction amounts, so that during the formal recording stage, when a corresponding combination model is recorded, the combination model is compensated using a mark correction amount corresponding to the combination model, and the compensation data is recorded using a segmented laser control strategy, so that heat interference between adjacent data bits is avoided, and the output data during playing is consistent with the actually recorded data, and distortion does not exist.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical storage technology, in particular to a method for accurately recording high resolution on high-density tracks. BACKGROUND

[0002] The conventional optical storage recording technology is a technology that converts digital signals into analog signals, then etches the surface of the optical disc by laser beam, and records information by etching small pits on the surface of the optical disc. Since the data to be recorded is usually converted into binary form, these pits represent "1" in binary data, and the blank space represents "0".

[0003] In order to meet the technical development trend of expanding storage capacity and storage density, high resolution recording can be used in the prior art, that is, in the cell frame as the recording unit length (i.e. one data bit), the amplitude of each data bit of the data to be recorded is adjusted to a degree that can perform high resolution recording, so as to improve the data storage capacity by increasing the line density. Unlike the binary recording mode in the past, which only optimizes the length of "1" data and "0" data before and after "1" data, in high resolution recording, the amplitude of the data to be recorded represents different recording information, and the data to be recorded is recorded continuously without gaps. When recording large amplitude data to be recorded, it may exceed its own data bit. At this time, there is no space between the data to be recorded, so when the data to be recorded reaches a certain degree, the data to be recorded will overlap and cannot be distinguished, resulting in ISI symbol interference, which leads to a high bit error rate during playback. SUMMARY

[0004] The present application provides a method for accurately recording high resolution on high-density tracks to overcome the technical problem of high bit error rate during playback caused by the ISI symbol interference problem in high resolution recording.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present application is:

[0006] A method for accurately recording high resolution on high-density tracks, the specific steps comprising:

[0007] S1: Preparation stage before recording

[0008] S11: Obtain the data to be recorded in a multi-ary form;

[0009] S12: Construct a data extraction frame, take the first data bit of the data to be recorded as the starting position of the data extraction frame, and make the data extraction frame move one data bit each time, so as to extract a plurality of combination models;

[0010] S13: record a plurality of combination models on the optical disc to obtain first distortion data;

[0011] S14: perform a recording compensation operation based on the first distortion data to obtain a plurality of mark correction amounts;

[0012] S2: formal recording stage

[0013] S21: for each combination model, a corresponding mark correction amount is used to perform compensation to obtain compensation data;

[0014] S22: based on a segmented laser control strategy, record the compensation data on the optical disc at high resolution.

[0015] Further, in S14, the process of performing a recording compensation operation based on the first distortion data to obtain a plurality of mark correction amounts is as follows:

[0016] The recording compensation operation using five-symbol interference is used to process the first distortion data to obtain the mark correction amount, including:

[0017] 1) input the first distortion data into a Volterra filter to perform convolution operation, and adjust the first distortion data according to a signal adjustment strategy to finally obtain second distortion data;

[0018] The signal adjustment strategy is to obtain the convolution signal output by the Volterra filter;

[0019] record the amplitude difference between the convolution signal and each data bit of the combination model, and sequentially determine whether each amplitude difference meets the set threshold value, if yes, the first distortion data is the second distortion data, otherwise adjust the amplitude of each data bit in the combination adjustment first distortion data until the amplitude difference between the convolution signal and each data bit of the combination model meets the set threshold value;

[0020] 2) establish an Lv. correction amount data table, and calculate the deviation amount, i.e. Lv. correction amount, between the corresponding data bits of the first distortion data and the second distortion data, and sequentially store the deviation amount in the Lv. correction amount data table according to the data bit serial number;

[0021] 3) calculate the overlapping area between adjacent data in the first distortion data, and after photoelectric conversion according to the overlapping area, obtain the overlapping recording signal of the data bit where the overlapping area is located, i.e. OLP recording signal;

[0022] 4) add the Lv. correction amount in the Lv. correction amount data table and the overlapping recording signal according to the data bit serial number to obtain the actual level of each data bit;

[0023] 5) calculating the amplitude difference between the actual level of each data bit and the data bit in the first distorted data, to obtain the corresponding mark correction of each data bit.

[0024] Further, in S21, for each combined model, the corresponding mark correction is used for compensation, and the process of obtaining the compensation data is:

[0025] The mark correction is superimposed on the to-be-recorded data with the intermediate sequence number in the data bit of the corresponding combined model, so as to obtain the compensation data.

[0026] Further, in the process of high-resolution recording compensation data on the optical disc based on the segmented laser control strategy, the complete recording process of one data bit on the optical disc is divided into three stages, namely:

[0027] Preheating stage, recording stage and cooling stage;

[0028] In the preheating stage, based on the compensation data and according to the preheating strategy, the laser power value Ps for increasing the temperature of the recording film of the optical disc and the laser pulse time Ts for increasing the temperature of the recording film of the optical disc are determined; and the preheating laser pulse operation is performed on the data bit according to the determined Ps and Ts;

[0029] In the recording stage, based on the compensation data and according to the recording strategy, the peak power Pw and the pulse time Ttop of the peak power for recording, and the maintenance power Pm and the pulse time Tm of the maintenance power for recording are determined; and the recording laser pulse operation is performed on the preheated data bit according to the determined Pw, Ttop, Pm and Tm, so as to realize high-resolution recording of the compensation data on the optical disc;

[0030] In the cooling stage, the minimum controllable power Pc for reducing the temperature of the recording film of the optical disc and the cooling laser pulse time Tc are set; and the cooling laser pulse operation is performed on the recorded data bit according to the set Pc and Tc.

[0031] Further, the preheating strategy is:

[0032] The reference laser power value Ps' for increasing the temperature of the recording film of the optical disc is set;

[0033] The reference laser pulse time Ts' for increasing the temperature of the recording film of the optical disc is set;

[0034] The recording resolution of the to-be-recorded data is set to N, and the gear n in which the compensation data is located is judged according to the value of the compensation data;

[0035] Ps and Ts are divided into N+1 gears, and the Ps of the nth gear is set according to the gear n in which the compensation data is located.

[0036] Ps= Ps' * (1+n*1%)

[0037] Set the Ts of the n-th gear as:

[0038] Ts= Ts' * (1+n*1%).

[0039] Further, the recording strategy is:

[0040] Set the peak power Pw of the recording and the pulse time Ttop of the peak power;

[0041] Set the maintaining power Pm of the recording as:

[0042] Pm =W +Ps

[0043] In the formula, W is the set fixed power, and Ps is the laser power value for improving the temperature of the recording film of the optical disc;

[0044] The process for determining the pulse time Tm of the maintaining power is:

[0045] Set the pulse time Tm' of the reference maintaining power;

[0046] Divide Tm into N+1 gears in total, and set the Tm of the n-th gear as:

[0047] Tm =Tm' * (1-n*1%).

[0048] Further, in the cooling stage, set the cooling laser pulse time Tc as:

[0049] Tc=T-Ts-Tw

[0050] In the formula, T is the time interval between the terminal of the last to-be-recorded data and the terminal of the current to-be-recorded data, and Tw is the total time of the recording stage.

[0051] Beneficial effects: the application constructs a data extraction frame, takes the first data bit of the to-be-recorded data as the starting position of the data extraction frame, and makes the data extraction frame move one data bit each time, so as to extract a plurality of combination models; and the application obtains the distorted data that may occur when the plurality of combination models are actually recorded in advance, and performs a recording compensation operation based on the distorted data to obtain a mark correction amount, so that, in the formal recording stage, when the corresponding combination model is recorded, the mark correction amount corresponding to the combination model is used to compensate it, and a segmented laser control strategy is used to record the compensated data, so as to ensure that there is no thermal interference problem between adjacent data bits, and ensure that the output data during playing is consistent with the actually recorded data, and there is no distortion problem. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on the accompanying drawings belong to the protection scope of the present application.

[0053] Figure 1 A flow chart of a method for accurately performing high-resolution recording on a high-density track in the present application;

[0054] Figure 2 A schematic diagram of high-resolution recording signal level in the embodiment of the present application;

[0055] Figure 3 A schematic diagram of segmenting control power for each data bit in the embodiment of the present application;

[0056] Figure 4 A schematic diagram of high-resolution amplitude laser control strategy in the embodiment of the present application;

[0057] Figure 5 A schematic diagram of overlapping area of adjacent data in the embodiment of the present application;

[0058] Figure 6 A schematic diagram of interference recording compensation between adjacent data bits in the embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on the accompanying drawings belong to the protection scope of the present application.

[0060] The embodiment provides a method for accurately performing high-resolution recording on a high-density track, as shown in Figure 1 The specific steps include:

[0061] S1: Preparation stage before recording

[0062] S11: Obtain the data to be recorded in a multi-ary form;

[0063] Specifically, in the embodiment, the multi-ary form of the to-be-recorded data does not include binary data, and the multi-ary form expressed herein includes but is not limited to quinary, decimal, etc. Specifically, in the embodiment, the multi-ary form of the to-be-recorded data is quinary form data.

[0064] S12: In order to be able to identify at high resolution when playing, the connection mode between the to-be-recorded data before and after identification is needed, therefore, in the embodiment, a data extraction frame is constructed, the first data bit of the to-be-recorded data is taken as the starting position of the data extraction frame, and the data extraction frame is moved by one data bit each time, so as to extract a plurality of combination models;

[0065] Specifically, in the embodiment, the data extraction frame is a five-bit data extraction frame, so as to extract five bits of data in sequence and continuously, and interference between five symbols is performed, so as to control the thermal interference generated during recording within the recording compensation range. In practice, six bits of data can also be extracted, and the method proposed in the application is adopted, so as to avoid the problem of thermal interference.

[0066] Specifically, if the end of the to-be-recorded data is extracted and there are less than five bits, the five bits are supplemented by 0.

[0067] Specifically, in the embodiment, each combination model includes five to-be-recorded data, i.e., two recorded marks before the current recorded mark + the current recorded mark + two recorded marks after the current recorded mark. For example, if the to-be-recorded data is 0, 1, 2, 3, 4, 1, 2, 3, 4…, it is divided into 0, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4…, and so on.

[0068] S13: Record a plurality of combination models on the optical disc to obtain first distorted data;

[0069] S14: Perform recording compensation operation based on the first distorted data to obtain a plurality of mark correction amounts;

[0070] In a specific embodiment, in S14, the process of performing recording compensation operation based on the first distorted data to obtain a plurality of mark correction amounts is as follows:

[0071] The recording compensation operation with five-symbol interference is used to process the un-compensated distorted data to obtain the mark correction amount, as shown in the following formula: Figure 6

[0072] 1) input the first distorted data into the Volterra filter for convolution operation, and adjust the first distorted data according to the signal adjustment strategy, and finally obtain second distorted data;

[0073] ​The signal adjustment strategy is as follows: acquire the convolution signal output by the Volterra filter; record the amplitude difference between the convolution signal and each data bit of the combined model, and sequentially determine whether each amplitude difference meets the set threshold. If so, the first distorted data is the second distorted data; otherwise, adjust the amplitude of each data bit in the first distorted data until the amplitude difference between the data bits of the convolution signal and each data bit of the combined model meets the set threshold.

[0074] Specifically, in this embodiment, the combined adjustment is assumed to be as follows: the first adjustment is based on the first distorted signal, the first bit is adjusted by 0.1, the second bit by 0.2, the third bit by 0.3, the fourth bit by 0.4, and the fifth bit by 0.5. However, the convolution signal output after the second bit adjustment still does not meet the threshold condition, so a second combined adjustment is performed based on the original first distorted signal: the first bit retains the previous adjustment value of 0.1, the second bit is changed to an adjustment of 0.1, the third bit is adjusted by 0.3, the fourth bit is adjusted by 0.4, and the fifth bit is adjusted by 0.5.

[0075] Specifically, since the first distorted data is a square marker signal, there is nonlinear distortion. In this embodiment, the square marker signal is convolved by a Volterra filter to make it approximate the signal data in the input combined model.

[0076] 2) Establish an Lv. correction amount data table, and calculate the deviation between the corresponding data bits of the first distorted data and the second distorted data, i.e., the Lv. correction amount, and store the deviation amount in the Lv. correction amount data table in sequence according to the data bit number;

[0077] 3) such as Figure 5 As shown in the figure, T0, T1, T2, T3 and T4 are the periods of each data point, and the period value is T. The overlapping area between adjacent data points in the first distorted data is calculated. After photoelectric conversion based on the overlapping area, the overlapping recording signal of the data point where the overlapping area is located is obtained, which is the OLP recording signal.

[0078] Specifically, the area refers to the area etched by the laser on the optical disc, which corresponds to the change in the brightness of the laser reflected light, and can be converted into an electrical signal through photoelectric conversion.

[0079] 4) Add the Lv. correction value in the Lv. correction value data table to the overlapping recording signal according to the data bit sequence number to obtain the actual level of each data bit;

[0080] 5) Calculate the amplitude difference between the actual level of each data bit and the data bit in the first distorted data to obtain the mark correction amount corresponding to each data bit.

[0081] Specifically, in the high-resolution recording process, the actual recorded data, i.e., the recording marks, have no interval between them, and to a certain extent, the symbols overlap and cannot be distinguished, resulting in the ISI symbol interference phenomenon, which leads to the distortion of the output data during the final playback. Therefore, in the embodiment, the to-be-recorded data is sequentially divided into a plurality of combination models, and a plurality of combination models are recorded on the optical disc in advance, to obtain the un-compensated distorted data corresponding to the plurality of combination models, and then the un-compensated distorted data is recorded with the ISI5 (Inter Symbol Interference 5) five-symbol interference compensation, to obtain the mark correction amount corresponding to the plurality of combination models in advance, and store it in the register. During the actual recording of the combination model, the mark correction amount in the register is directly called for adjustment according to different combination models, so that the data output during playback is consistent with the actual recorded data, and there is no distortion problem.

[0082] S2: formal recording phase

[0083] S21: compensating with the corresponding mark correction amount for each combination model to obtain compensated data;

[0084] In a specific embodiment, in S21, the process of adjusting the corresponding mark correction amount for the plurality of combination models to obtain the adjusted to-be-recorded data is as follows:

[0085] Specifically, the mark correction amount is superimposed on the to-be-recorded data with the middle sequence number in the corresponding combination model, so as to obtain the compensated data.

[0086] S22: high-resolution recording of the compensated data on the optical disc based on the segmented laser control strategy, as shown in Figure 2 Specifically, in the process of high-resolution recording of the compensated data on the optical disc based on the segmented laser control strategy, the complete recording process of one data bit on the optical disc is divided into three stages as shown in Figure 3 and Figure 4 , so as to control the amplitude degree of the to-be-recorded data with higher precision, i.e.,

[0087] the preheating phase, the recording phase, and the cooling phase;

[0088] In the preheating phase, the laser power value Ps for increasing the temperature of the recording film of the optical disc and the laser pulse time Ts for increasing the temperature of the recording film of the optical disc are determined based on the compensated data and according to the preheating strategy; and the data bit is subjected to a preheating laser pulse operation according to the determined Ps and Ts;

[0089] Specifically, in the preheating phase,

[0090] The preheating strategy is:

[0091] Setting a reference laser power value Ps' for increasing the temperature of the recording film of the optical disc;

[0092] Setting a reference laser pulse time Ts' for increasing the temperature of the recording film of the optical disc;

[0093] Setting the recording resolution of the data to be recorded as N, and determining the gear n in which the compensation data is located according to the value of the compensation data;

[0094] Dividing Ps and Ts into N+1 gears, and setting the Ps of the nth gear as:

[0095] Ps= Ps' * (1+n*1%)

[0096] Setting the Ts of the nth gear as:

[0097] Ts= Ts' * (1+n*1%).

[0098] Specifically, since high-frequency recording is used, thermal interference between the front and rear recording pulses occurs, and in the embodiment, a preheating stage is set to pre-increase the temperature range of the recording film of the optical disc, so that the influence of thermal interference can be eliminated.

[0099] Specifically, since there is high-value data to be recorded, if the preheating of the recording film of the optical disc is insufficient, i.e. the power is insufficient and the preheating time is insufficient, the start of the high-value data to be recorded is prone to be delayed, so in the embodiment, Ps and Ts are set in gears, i.e. the corresponding power and time are given according to the gear in which the value of the data to be recorded is located, so that the data is recorded.

[0100] Specifically, for example, the data to be recorded is 0, 1, 2, 3, 4, and the recording resolution is set to 40, which means that 0, 1, 2, 3, 4 are divided into 0, 0.1, 0.2, 1, 1.1, 1.2, 2, 2.1, 2.2, 3, 3.1, 3.2, 4, a total of 41 gears; then Ps and Ts are divided into 41 gears according to the set recording resolution 40, and the power value and time of the corresponding gear are calculated, when the adjusted data to be recorded is recorded, the power value and time of the laser are adjusted according to the gear of the adjusted data to be recorded, for example, the compensation data is 0.1, which is in the second gear, so n is taken as 2 and substituted into the corresponding calculation formula, so that the power and time when 0.1 is recorded can be obtained; for example, the compensation data is 3.3, which is in the 34th gear, so n is taken as 34 and substituted into the corresponding calculation formula, so that the power and time when 3.3 is recorded can be obtained.

[0101] In the recording stage, the peak power Pw and the pulse time Ttop of the peak power for recording and the maintaining power Pm and the pulse time Tm of the maintaining power for recording are determined based on the compensation data and according to the recording strategy; and the recording laser pulse operation is performed on the preheated data bit according to the determined Pw, Ttop, Pm and Tm, so as to realize the high-resolution recording of the adjusted to-be-recorded data on the optical disc.

[0102] Specifically, the recording strategy is that the peak power Pw and the pulse time Ttop of the peak power for recording are set.

[0103] The maintaining power Pm for recording is set as:

[0104] Pm = W + Ps

[0105] In the formula, W is a set fixed power, and Ps is a laser power value for improving the temperature of the recording film of the optical disc.

[0106] The process of determining the pulse time Tm of the maintaining power is:

[0107] The pulse time Tm' of the reference maintaining power is set.

[0108] The Tm is divided into N+1 gears, and the Tm of the nth gear is set according to the gear n in which the compensation data is located.

[0109] Tm = Tm' * (1-n*1%).

[0110] Specifically, in the embodiment, the recording stage is the interval in which the recording marks are formed on the optical disc, i.e. the stage of recording the to-be-recorded data.

[0111] Specifically, in the embodiment, the difference W between Pm and Ps is a set fixed value, which is used to ensure that the power in the recording stage exceeds the power in the preheating stage, and there is sufficient power difference to complete the recording state.

[0112] In the cooling stage, the minimum controllable power Pc for reducing the temperature of the recording film of the optical disc and the cooling laser pulse time Tc are set; and the cooling laser pulse operation is performed on the recorded data bit according to the set Pc and Tc.

[0113] Specifically, in the cooling stage, the cooling laser pulse time Tc is set as:

[0114] Tc = T-Ts-Tw

[0115] In the formula, T is the time interval between the terminal of the last to-be-recorded data and the terminal of the current to-be-recorded data, and Tw is the total time of the recording stage.

[0116] Specifically, the cooling stage is a temperature decreasing interval, and the purpose is to avoid subsequent thermal influence and ensure the smooth progress of subsequent work.

[0117] Specifically, in the embodiment, the following advantages are obtained by using the segmented laser control strategy to record the adjusted data to be recorded on the optical disc: (1) the thermal influence is controlled within the range of the recording compensation; (2) the distortion degree of the waveform at the start of the data to be recorded is reduced; and (3) the resolution of the pulse width is ensured to meet the requirements.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of accurately performing high resolution recording on high density tracks, characterized by, The specific steps include: S1: preparation stage before recording S11: obtaining the data to be recorded in a multi-form; S12: constructing a data extraction frame, taking the first data bit of the data to be recorded as the starting position of the data extraction frame, and moving the data extraction frame by one data bit each time, thereby extracting a plurality of combination models; S13: recording a plurality of combination models on the optical disc to obtain first distorted data; S14: performing recording compensation operation based on the first distorted data to obtain a plurality of mark correction amounts; S2: formal recording stage S21: for each combination model, using the corresponding mark correction amount to perform compensation to obtain compensation data; S22: recording the compensation data on the optical disc based on a segmented laser control strategy.

2. The method of claim 1, wherein In S14, the process of performing recording compensation operation based on the first distorted data to obtain a plurality of mark correction amounts is as follows: The recording compensation operation of five-symbol interference is used to process the first distorted data to obtain the mark correction amount, including: 1) inputting the first distorted data into a Volterra filter to perform convolution operation, and adjusting the first distorted data according to a signal adjustment strategy to finally obtain second distorted data; The signal adjustment strategy is to obtain the convolution signal output by the Volterra filter; Record the amplitude difference between the convolution signal and each data bit of the combination model, and sequentially determine whether each amplitude difference meets the set threshold value, if yes, the first distorted data is the second distorted data, otherwise adjust the amplitude of each data bit in the combination adjusted first distorted data until the amplitude difference between the convolution signal and each data bit of the combination model meets the set threshold value; 2) establishing an Lv. correction amount data table, and calculating the deviation amount, i.e. Lv. correction amount, between the corresponding data bits of the first distorted data and the second distorted data, and sequentially storing the deviation amount into the Lv. correction amount data table according to the data bit serial number; 3) calculating the overlapping area between adjacent data in the first distorted data, and after photoelectric conversion according to the overlapping area, obtaining the overlapping recording signal of the data bit where the overlapping area is located, i.e. OLP recording signal; 4) adding the Lv. correction amount in the Lv. correction amount data table and the overlapping recording signal according to the data bit serial number to obtain the actual level of each data bit; 5) calculating the amplitude difference between the actual level of each data bit and each data bit in the first distorted data to obtain the mark correction amount corresponding to each data bit.

3. The method of claim 2, wherein the high-density track is a track on a DVD-RW disc. In S21, the process of using the corresponding mark correction amount to perform compensation for each combination model to obtain compensation data is as follows: Superimpose the mark correction amount and the data to be recorded with the intermediate serial number in the corresponding combination model to obtain the compensation data.

4. The method of claim 3, wherein In the process of recording the compensation data on the optical disc based on the segmented laser control strategy, the complete recording process of one data bit on the optical disc includes three stages, i.e. preheating stage, recording stage and cooling stage; ​ In the preheating stage, laser power value Ps for increasing the temperature of the recording film of the optical disc and laser pulse time Ts for increasing the temperature of the recording film of the optical disc are determined based on the compensation data and according to a preheating strategy; and preheating laser pulse operation is performed on the data bit according to the determined Ps and Ts; In the recording stage, peak power Pw for recording and pulse time Ttop of the peak power and maintaining power Pm for recording and pulse time Tm of the maintaining power are determined based on the compensation data and according to a recording strategy; and recording laser pulse operation is performed on the preheated data bit according to the determined Pw, Ttop, Pm and Tm, so as to realize high-resolution recording of the compensation data on the optical disc; In the cooling stage, minimum controllable power Pc for decreasing the temperature of the recording film of the optical disc and cooling laser pulse time Tc are set; and cooling laser pulse operation is performed on the recorded data bit according to the set Pc and Tc.

5. The method of claim 4, wherein The preheating strategy is: setting reference laser power value Ps' for increasing the temperature of the recording film of the optical disc; setting reference laser pulse time Ts' for increasing the temperature of the recording film of the optical disc; setting the recording resolution of the to-be-recorded data as N, and judging the gear n in which the compensation data is located according to the value of the compensation data; dividing Ps and Ts into N+1 gears in total, and setting the Ps of the nth gear as: Ps= Ps' * (1+n*1%) setting the Ts of the nth gear as: Ts= Ts' * (1+n*1%).

6. The method of claim 5, wherein, The recording strategy is: setting peak power Pw for recording and pulse time Ttop of the peak power; setting maintaining power Pm for recording as: Pm = W + Ps wherein W is the set fixed power, and Ps is the laser power value for increasing the temperature of the recording film of the optical disc; the process of determining pulse time Tm of the maintaining power is: setting reference pulse time Tm' of the maintaining power; dividing Tm into N+1 gears in total, and setting the Tm of the nth gear as: Tm = Tm' * (1-n*1%).

7. The method of claim 6, wherein the high-density track is a track on a DVD-RW disc. In the cooling stage, cooling laser pulse time Tc is set as: Tc = T - Ts - Tw wherein T is the time interval between the terminal of the last to-be-recorded data and the terminal of the present to-be-recorded data, and Tw is the total time of the recording stage.

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