JPH087369A - Magneto-optical disk device - Google Patents

Abstract

(57) [Abstract] [Purpose] To shorten the time required for trial writing to determine the optimum recording power and improve the usage efficiency of the magneto-optical disk device. [Configuration] The CPU 1, which is the optimum recording power determination means,
ID data indicating a manufacturer name or the like is read from the magneto-optical disk 12, and a pair of ID data registered in advance in the non-volatile memory 4 and a matching ID among the standard data are registered.
Search for data. Next, trial writing is performed with reference to the standard recording power of the standard data paired with the matched ID data, and the optimum recording power with a margin and at which a writing error does not reliably occur is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device for recording (or recording and reproducing) information using a magneto-optical disk, and particularly stores or registers data such as recording power during writing (recording). The present invention relates to a magneto-optical disk device provided with an electrically rewritable nonvolatile memory.

[0002]

2. Description of the Related Art Optical discs and magneto-optical discs for recording / reproducing information using laser light have a much higher recording density than conventional magnetic discs, and are therefore widely used as compact and large-capacity discs. It is like this. In particular, magneto-optical disks are promising because they can be rewritten as many times as magnetic disks, unlike write-once optical disks, which are inexpensive but cannot be re-recorded once they have been recorded. .

However, since there is no problem because the reproduction (reading) of information is carried out by the laser beam having a weak power, a laser beam having a stronger power is required at the time of recording (writing) than that at the time of reproducing. If the recording power is insufficient, writing becomes unstable and errors continue, and in extreme cases, writing may become impossible.

On the contrary, if the recording power is too strong, the writing is surely performed, but since the effective diameter of the spot of the laser light imaged on the recording surface of the magneto-optical disk is enlarged, they are close to each other in order to increase the recording density. This will affect the surrounding bits that have been placed and cause an error. Therefore, the recording power for writing must be set to an optimum power, although there is a certain allowable range.

Therefore, manufacturers of magneto-optical disks have announced recommended recording power values for the magneto-optical disks. However, the actual optimum recording power has an unavoidable variation at the time of manufacture and the influence of the operating conditions, especially the ambient temperature, and the efficiency of the optical system of the magneto-optical disk device to be inserted and the light source element such as a laser are increased. The recommended value is only a guide, because the variation of the light emission efficiency of the diode and the temperature change are large.

Therefore, shipping adjustments are made for each individual magneto-optical disk device to determine the optimum recording power for the magneto-optical disk of each maker, and the temperature at that time and the nonvolatile memory provided in the magneto-optical disk device, for example. A method of registering in a ROM, EPROM or the like and shipping the same has been adopted.

Alternatively, a method of determining the optimum recording power by performing trial writing each time it is necessary, for example, US Pat. No. 5140
As described in Japanese Patent No. 580, the trial writing is repeated while reducing the recording power from the maximum power of the light source element by a certain step value, and the power level at which an error occurs for the first time is optimized by adding a preset margin. There was a proposal to determine the recording power.

[0008]

If the data at the time of shipment adjustment is used, the optimum recording power with higher accuracy than the value recommended by the magneto-optical disk maker can be obtained. However, there is no problem if the magneto-optical disk device or the magneto-optical disk is new, but the recording power gradually becomes insufficient due to dust and dirt adhering during use, deterioration of the magneto-optical disk itself over time, and an error occurs. It is inevitable that it will be easy to do.

Further, if the magneto-optical disk itself is developed and a product other than the manufacturer tested at the time of shipment adjustment is used, or a new magneto-optical disk with improved performance is put on the market by the same manufacturer, Standard data registered in the non-volatile memory cannot be used. It is practically impossible to replace the non-volatile memory of the magneto-optical disk device at the user's place each time or periodically.

In the above case, US Pat. No. 51405
The proposal presented in the '80 specification is extremely effective. However, the proposal has a problem that the time required for trial writing becomes long because trial writing is repeated while starting from maximum power and lowering the power.

Further, since the recording power is influenced by the temperature, even if the optimum recording power is initially determined by trial writing, it cannot always be guaranteed that the optimum state is always due to a temperature change during use, such as a temperature rise. for that reason,
If the margin to be added is set to a large value, the laser diode or the like will be driven with more power than necessary, and the problem of accelerating deterioration also occurs.

The present invention has been made in view of the above points, and shortens the time required for trial writing to improve the use efficiency of the magneto-optical disk device, and obtains the optimum recording power for performing reliable writing. The purpose is to be.

[0013]

In order to achieve the above object, the present invention provides ID data such as the manufacturer name or type name of the magneto-optical disk to be used, standard recording power for writing and temperature at that time. A magneto-optical disk device that includes an electrically rewritable non-volatile memory that is registered in advance with a pair of standard data and writes information using an inserted magneto-optical disk, when the power is turned on or when the magneto-optical disk is used. By performing the trial writing performed at the time of insertion with reference to the standard data paired with the ID data registered in the non-volatile memory that matches the ID data read from the inserted magneto-optical disk. An optimum recording power determining means for determining the optimum recording power is provided.

Further, the optimum recording power determining means performs trial writing for each recording power obtained by adding or subtracting a step value within a preset range centering on the standard recording power of the standard data as a reference. It is advisable to use this as a means for determining the optimum recording power.

In the above-mentioned magneto-optical disk device, the difference between the optimum recording power determined by the optimum recording power determining means and the standard recording power of the standard data registered in the non-volatile memory exceeds a preset threshold value. When
It is preferable to provide a standard data updating unit for updating the registered standard data with the optimum recording power and the temperature at the trial writing.

Alternatively, when the difference between the optimum recording power determined by the optimum recording power determining means and the standard recording power of the standard data registered in the non-volatile memory exceeds a preset threshold value, the operator is warned. A warning means may be provided.

The ID read from the magneto-optical disk
It is determined by performing an ID registration means for registering the read ID data in the nonvolatile memory when the data does not match any of the ID data registered in the nonvolatile memory, and performing trial writing while changing the recording power. It is advisable to provide standard data registration means for forming standard data together with the temperature at the time of trial writing with the optimum recording power as the standard recording power and registering the standard data in the nonvolatile memory so as to form a pair with the ID data registered by the ID registration means.

Further, the temperature of the recording power is determined from the difference between the optimum recording power determined by the optimum recording power determining means and the temperature at that time and the standard recording power of the standard data registered in the nonvolatile memory and the temperature at that time. A correction coefficient calculating means for calculating a correction coefficient and a temperature correction coefficient calculated by the means are used to correct the optimum recording power in accordance with the difference between the temperature at the time of writing information and the temperature at which the optimum recording power is determined. Power correction means for obtaining the recording power for writing information may be provided.

[0019]

The magneto-optical disk device configured as described above is
Since the test writing is performed based on the standard data paired with the ID data registered in the non-volatile memory that matches the ID data read from the magneto-optical disk into which the optimum recording power determination means is inserted, the test writing is performed in a short time. The optimum recording power can be easily determined.

Further, the optimum recording power determining means determines the optimum recording power while adding or subtracting the step value within a preset range centering on the standard recording power of the standard data as a reference. The optimum recording power can be reliably determined in a short time. In either case, the optimum recording power is determined in a short time, so that the utilization efficiency of the magneto-optical disk device is improved and reliable writing is performed.

When the difference between the optimum recording power determined as described above and the standard recording power of the standard data exceeds a preset threshold value, the standard data updating means updates the optimum recording power and the temperature at the trial writing. Since the data is updated as standard data, the number of trial writings for determining the optimum recording power, that is, the time required for determination, does not increase excessively even if there is a change over time such as dirt or deterioration of the magneto-optical disk.

Alternatively, when the difference exceeds a threshold value, the warning means warns the operator through a display, an alarm sound, and the like.
In this case, the operator can determine whether to immediately update the standard data or ignore it as an accidental error while the frequency of warning is low. Therefore, it is possible to set the threshold to a low value.

Further, when a new type of magneto-optical disk is inserted, the read ID data does not match any of the ID data registered in the non-volatile memory. Therefore, the ID registration means outputs the read ID data. In addition to registering in the non-volatile memory, the standard data registration means performs the trial writing while changing the recording power, and the optimum recording power determined at that time and the temperature at that time are recorded as standard data in the non-volatile memory so as to be paired with the ID data. to register. Therefore, it takes only a first time to determine the optimum recording power, and the second and subsequent times can be determined in a short time like the already registered magneto-optical disk.

Further, the correction coefficient calculating means divides the difference between the optimum recording power determined by the optimum recording power determining means and the standard recording power of the registered standard data by the temperature difference to obtain the temperature correction coefficient. If the temperature changes during use, the power correction means corrects the recording power according to the amount of change by using the correction coefficient. Therefore, even if the temperature changes, the optimum recording power is determined each time. This eliminates the need for re-doing, improves the usage efficiency of the magneto-optical disk device, and ensures reliable writing.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a magneto-optical disk device according to an embodiment of the present invention.

The magneto-optical disk device 10 shown in FIG.
CPU1 and RO connected to each other by a bus (line)
M2, RAM 3, non-volatile memory 4, I / F (interface) circuit 5, R / W (read / write) control unit 6,
I / O circuit 7, R / W control unit 6 and I / O circuit 7
An optical head 8 and a temperature sensor 9 which are connected to each other, and a magneto-optical disk 12 is detachably inserted.

The CPU 1 performs sequence control, process control and data processing of the entire magneto-optical disk device 10,
In the first and second embodiments, which will be described later, as optimum recording power determining means, in the third and fourth embodiments, as standard data updating means and warning means, in the fifth embodiment, as ID registration means and standard data registration means, In the sixth embodiment, they function as a correction coefficient calculation means and a power correction means, respectively.

The ROM 2 stores in advance programs for routines executed by the CPU 1 and constant data. RAM
Reference numeral 3 temporarily stores variable data and data (information) recorded or reproduced on the magneto-optical disk 12. CP
The commands input and output by the U1 and the data stored in the RAM 3 are input via the I / F circuit 5 to a host machine 20 such as a personal computer, a workstation or a document creation device connected to the I / F circuit 5. Is output.

For example, in the electrically rewritable nonvolatile memory 4 such as a flash memory, the name of each maker of the attachable magneto-optical disk 12 or the code indicating the type of the same maker if the performance is different And the standard data including the standard recording power at the time of writing of the laser diode, which is the laser light source (not shown) of the optical head 8, and the standard temperature which is the temperature when the standard recording power is determined. Multiple sets are stored.

The R / W controller 6 controls the optical head 7 to record / reproduce data on / from the magneto-optical disk 12. In the case of data recording, the laser light is turned on / off according to the data input via the bus, and feedback control is performed so that the power of the laser light at the time of on is maintained at the instructed recording power.

In the case of erasing data, the laser light is continuously output with a power approximately the same as the recording power. In the case of data reproduction, the laser light polarized with a power much smaller than the recording power is continuously output, the reflected light from the magneto-optical disk 12 is received, and "0" or "is" depending on the turning direction of the polarization plane. 1 ”is identified and output as reproduction data.

All the I / O circuits 7 are connected to various drive control units and sensor groups (not shown). The temperature sensor 9, which is one of the sensors forming the sensor group, is a magneto-optical sensor. The temperature of the disk 12 or its vicinity is detected moment by moment and output to the bus via the I / O circuit 7.

FIG. 2 shows the optimum recording power determining means C.
It is a flowchart which shows 1st Example of the routine which PU1 performs. Power determination A, which is a routine for determining the optimum recording power shown in FIG. 2, is performed when the magneto-optical disk 12 is inserted into the magneto-optical disk device 10 or when the magneto-optical disk 12 is inserted. It is executed in each initialization routine when the power of the device 10 is turned on.

When this routine starts, first in step 1, the ID data is read from the inserted magneto-optical disk 12 to obtain read ID data, and then in step 2, the registered ID data registered in the nonvolatile memory 4 is read. Among them, the registered ID data that matches the read ID data is searched.

When the matching registered ID data is found, the routine proceeds to step 3, where the standard recording power and the standard temperature of the standard data registered in pair with the matching ID data are read out and stored in a predetermined area of the RAM 3. Remember. Further, in step 4, trial writing is performed using the recording power on the RAM 3 as a reference value, the optimum recording power is determined, and the process ends. After that, each time data is recorded, the R / W control unit 6 controls the power of the laser light of the optical head 8 with the determined optimum recording power on the RAM 3.

FIG. 3 is a flow chart showing a second embodiment which is an example of a routine in which a part of the first embodiment shown in FIG. 2 is further detailed. Steps 1 to 3 are the first embodiment. The description is omitted because it is the same as.

Each value is defined as follows. That is, the standard recording power is Pstd, the recording power for trial writing is P, and the step value to be added or subtracted when changing the recording power is Ps, which is added to the minimum recording power at which no error occurs during trial writing to obtain the optimum recording power. The margin value is M, the obtained optimum recording power is Pmsw, and the value obtained by subtracting the margin value from the allowable maximum power of the laser diode, that is, the power upper limit value that does not exceed the allowable maximum power even if the margin value is added to that value is Pmax. .

If the step value Ps and the margin value M among the above-mentioned values are set in advance, the power maximum value Pmax is set because the allowable maximum power is determined by the laser diode used. The lower limit of the range of the recording power P for trial writing may be zero, but it is limited by the occurrence of an error, and its upper limit is limited by the power upper limit Pmax.

When the power determination B of the routine shown in FIG. 3 is started and steps 1 to 3 are executed as in the first embodiment (FIG. 2), the recording power P is calculated in step 6.
Is set to the standard recording power Pstd, and trial writing is executed in step 7. In step 8, it is determined whether or not an error has occurred in the data. If not, the process jumps to step 14, and if an error occurs, the process proceeds to step 9.

In step 9, the step value Ps is added to the recording power P, that is, the recording power is increased by one step, and in step 10, the new recording power P is set to the power upper limit value Pmax.
It is determined whether or not is exceeded. If it exceeds, the main cause is deterioration of the laser diode or the magneto-optical disk 12 or excessive contamination, so that the routine jumps to the accident handling routine of step 11.

If not, that is, if P ≦ Pmax, step 1
Proceed to step 2 to perform trial writing, and in step 13, determine whether or not an error has occurred. If an error has occurred, return to step 9 to repeat increment of the recording power P. If no, that is, no error occurs, proceed to step 18. To jump.

When jumping from step 8 to step 14, the step value Ps is subtracted from the recording power P, that is, the recording power is reduced by one step, and the process proceeds to step 15 to perform trial writing. If there is no error, the process returns to step 14 to repeatedly decrement the recording power P. If an error occurs, the recording power P is increased by one step in step 17, and the process proceeds to step 18.

Whether jumping from step 13 or advancing from step 17, the recording power P is the minimum recording power at which an error does not occur before entering step 18. Therefore, the margin value is determined in step 18. The optimum recording power Pmsw is obtained by adding M, and the end is reached.

The margin value M is set in advance so that the optimum recording power Pmsw determined at the time of initial setting does not matter even if the ambient condition, especially the temperature changes during use. If an excessively large value is set, the power upper limit value Pmax becomes small and the range of trial writing becomes narrow.

As described above, according to the first or second embodiment, the trial writing is performed with the standard recording power of the standard data registered in the non-volatile memory 4 as a reference. Compared with the conventional magneto-optical disk device that performs trial writing while stepping down, the number of trial writings is much smaller, and the time required to determine the optimum recording power is shortened accordingly.

Alternatively, compared with the conventional example, the step value Ps
Even if the value is set to a small value, the time required to determine the optimum recording power does not become long, and the small step value Ps allows the optimum recording power Pmsw to be determined more accurately.

FIG. 4 is a flow chart showing a third embodiment of the routine executed by the CPU 1 which is the standard data updating means and the warning means. After completion of the routine for determining the optimum recording power shown in FIG. 2 or FIG. It is what is executed.

When the standard data update / warning A which is the routine shown in FIG. 4 is started, the temperature T immediately after the determination of the optimum recording power detected by the temperature sensor 9 is read through the I / O circuit 7 in step 20. , And is stored adjacent to the optimum recording power Pmsw on the RAM 3. Next step 21
In step 22, the difference (absolute value) ΔP between the optimum recording power Pmsw and the standard recording power Pstd registered in the non-volatile memory 4 is calculated, and in step 22, whether or not the difference ΔP exceeds a preset threshold value is determined. If the result of the determination is negative, the process jumps to the end, and if it exceeds the threshold value, the process proceeds to step 23.

At step 23, the optimum recording power Pmsw on the RAM 3 and the temperature T are registered as new standard data in the area of the old standard data on the non-volatile memory 4 and updated. Magnetic disk 12
After alerting the operator that the standard data of
Become the end.

According to the third embodiment, when the optimum recording power changes so as to exceed the threshold value due to deterioration or stain with time, the standard data is updated without bothering the operator. The number of trial writings, which had been increased by the dynamic change, is reduced, and the time required for the decision is shortened again. The warning also informs the operator that the standard data has been updated.

FIG. 5 is a flow chart showing another example of the standard data update and warning routine. The same parts as those in the third embodiment shown in FIG. 4 are designated by the same step numbers.
That is, the steps 20 to 22 of the standard data update / warning B of the fourth embodiment shown in FIG. 5 are the same as those of the third embodiment, and therefore the description thereof will be omitted.

If ΔP> threshold value in step 22, the process proceeds to step 25 to warn the operator that the difference ΔP exceeds the threshold value, and in step 26, the operator waits for an instruction input. When the operator decides whether to update the standard data or ignores the warning as not necessary and gives an instruction, the process proceeds to step 27, where it is determined whether the operator's instruction is to update the standard data. If it is an update and jumps to the end, the process proceeds to step 28, where the standard data is updated as in step 23 of the routine shown in FIG.

According to the fourth embodiment, in addition to the effects of the third embodiment, the standard data is updated if the warning is repeated by the operator's judgment, and if the warning is the first or rare warning, an accidental error occurs. Can be ignored. In this case, since the operator can make a judgment, it is possible to set the threshold value of the difference ΔP smaller than that in the third embodiment (FIG. 4).

FIG. 6 is a flow chart showing a fifth embodiment of the routine executed by the CPU 1 which is the ID registration means and the standard data registration means. The routine of the optimum recording power determination shown in FIG. 2 or FIG. The one that is executed before.

ID of the new type of magneto-optical disk shown in FIG.
When the data and the standard data registration routine ID / standard data registration is started, in step 30 and step 31, it is inserted as in step 1 and step 2 of the first or second embodiment (power determination A, B). The ID data is read out from the magneto-optical disk 12 that is being used as read ID data, and the registered ID data in the non-volatile memory 4 that matches the read ID data is searched for.

Next, in step 32, it is judged whether or not there is matching registration ID data, and if there is, jump to step 3 of power determination A or B (FIG. 2 or 3),
If not, it means that a new type of magneto-optical disk has been inserted. Therefore, the process proceeds to step 33 to register the read ID data as new ID data in the non-volatile memory 4, and then proceeds to step 34.

In step 34, since there is no standard recording power as a reference, even if it takes some time, trial writing is repeated while reducing the recording power from the maximum power of the light source element by a certain step value, and an error occurs for the first time. The optimum recording power Pmsw is determined by a method such as adding a margin value to the generated power level or the minimum power level at which no error occurs.

The determined optimum recording power Pmsw forms new standard data on the RAM 3 together with the temperature T at that time. Next, in step 35, the formed standard data is registered in the nonvolatile memory 4 so as to form a pair with the previously registered ID data, and the process goes to the end.

According to the fifth embodiment, when a new magneto-optical disk 12 which is not registered in the non-volatile memory 4 is inserted, the ID data corresponding to the magneto-optical disk 12 and the standard data are paired. And is registered in the nonvolatile memory 4. Therefore, even if it takes time to determine the optimum recording power only in the first time, it becomes possible to determine the optimum recording power in the short time after the second time as in the case of the already registered magneto-optical disk.

FIG. 7 and FIG. 8 are flow charts showing two routines executed by the CPU 1 which is the correction coefficient calculation means and the power correction means, that is, the correction coefficient calculation and the power correction, respectively. 3 is executed after the completion of the routine for determining the optimum recording power, and the power correction is executed at any time after the correction coefficient calculation has been executed for some time, but it is functionally combined into one set to form the sixth embodiment. Is formed.

When the routine correction coefficient calculation shown in FIG. 7 starts after the optimum recording power Pmsw is determined, the temperature T immediately after the determination of the optimum recording power detected by the temperature sensor 9 is read in step 40 and stored in the RAM 3 as the reference temperature Tk. To do. Next, at step 41, the standard recording power Pstd constituting the standard data registered in the nonvolatile memory 4
And the standard temperature Tstd at that time are read and RAM3 is also used.
To memorize.

Further, in step 42, the RAM 3
By dividing the difference between the optimum recording power Pmsw and the standard recording power Pstd, which is stored in, by the difference between the reference temperature Tk and the standard temperature Tstd, the temperature correction coefficient K of the recording power is calculated and stored in the RAM 3, Become the end.

If the temperature correction coefficient K is registered in the non-volatile memory 4 as part of the standard data in advance, the correction coefficient calculation is performed by a routine (FIG. 6) for registering data of a new type of magneto-optical disk. After the execution, when there is a difference between the temperature T and the registered standard temperature Tstd, it is sufficient to execute the operation once and register the result.

The routine power correction shown in FIG. 8 is executed every preset time, but before this routine is executed, the optimum recording power Pmsw determined in the RAM 3 as already described, The reference temperature Tk and the temperature correction coefficient K are stored.

When the power correction shown in FIG. 8 is started, the current temperature T is read in step 45 and step 4
In step 6, the difference between the read temperature T and the reference temperature Tk is multiplied by the temperature correction coefficient K to calculate the power correction value Pc. Next, at step 47, the calculated power correction value Pc is added to the optimum recording power Pmsw to determine the temperature-corrected recording power P, and the end is reached.

According to the sixth embodiment, the routine for calculating the correction coefficient is executed to obtain the temperature correction coefficient K, and the coefficient K is calculated.
Since the recording power P is corrected by executing a power correction routine at regular time intervals using, the magneto-optical disk device 1
Even if the temperature changes while the power of 0 is on, the data is always written with the best recording power P. Therefore, even if the margin value M that determines the optimum recording power is set to be relatively small, there is no possibility that a writing error will occur.

Further, by setting the margin value M to be relatively small, reliable writing can be performed even if the laser diode of the optical head 8 does not output more power than necessary, and the drive is performed reasonably to extend its life. You can Further, the range of recording power for trial writing is widened.

[0068]

As described above, in the magneto-optical disk device according to the present invention, the time required for the trial writing for determining the optimum recording power is shortened, so that the use efficiency is improved and the recording for sure writing is performed. Power is gained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magneto-optical disk device according to an embodiment of the present invention.

FIG. 2 is a flow chart showing a routine for determining an optimum recording power according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a second embodiment of the routine shown in FIG. 1 in more detail.

FIG. 4 is a flowchart showing a standard data update and warning routine according to a third embodiment of the present invention.

FIG. 5 is a flowchart showing another example of the standard data update and warning routine according to the fourth embodiment of the present invention.

FIG. 6 is a flowchart showing a routine for registering ID data and standard data according to a fifth embodiment of the present invention.

FIG. 7 is a flowchart showing an example of a correction coefficient calculation routine which is a part of the sixth embodiment of the present invention.

FIG. 8 is a flowchart showing an example of a recording power correction routine which is another part of the sixth embodiment of the present invention.

[Explanation of symbols]

 1: CPU 4: Non-volatile memory 10: Magneto-optical disk device 12: Magneto-optical disk 20: Host machine P: Recording power Pmsw: Optimal recording power Ps: Step value Pstd: Standard recording power T: Temperature Tk: Reference temperature Tstd: Standard temperature K: Temperature correction coefficient

Claims (6)

[Claims] 1. An electrically rewritable pre-registered pair of ID data such as the manufacturer name or type name of the magneto-optical disk to be used and standard data such as standard recording power for writing and temperature at that time. In a magneto-optical disk device that has a non-volatile memory and uses the inserted magneto-optical disk to write information, test writing that is performed when the power is turned on or when the magneto-optical disk is inserted is inserted. Optimal recording power determination means for determining the optimal recording power by performing the standard data paired with the ID data registered in the non-volatile memory that matches the ID data read from the magneto-optical disk as a reference. A magneto-optical disk device provided. 2. The magneto-optical disk device according to claim 1, wherein the optimum recording power determination means adds step values within respective preset ranges centering on the standard recording power of the standard data as the reference. Alternatively, the magneto-optical disk device is means for determining the optimum recording power by performing the trial writing for each of the subtracted recording powers. 3. The magneto-optical disk device according to claim 1, wherein the optimum recording power determined by the optimum recording power determining means and the standard recording power of standard data registered in the nonvolatile memory are set. A magneto-optical disk device comprising standard data updating means for updating the registered standard data with the optimum recording power and the temperature at the trial writing when the difference exceeds a preset threshold value. . 4. The magneto-optical disk device according to claim 1, wherein the optimum recording power determined by the optimum recording power determination means and standard data registered in the nonvolatile memory are stored. A magneto-optical disk device comprising warning means for warning an operator when a difference from the standard recording power exceeds a preset threshold value. 5. The magneto-optical disk device according to claim 1, wherein the ID data read from the magneto-optical disk does not match any of the ID data registered in the nonvolatile memory. ID registration means for registering the read ID data in the non-volatile memory, and the optimum recording power determined by performing the test writing while changing the recording power is used as the standard recording power to form the standard data together with the temperature at the time of the trial writing. And a standard data registering unit for registering the ID data registered by the ID registering unit in the nonvolatile memory so as to form a pair with the ID data registered by the ID registering unit. 6. The magneto-optical disk device according to claim 1, wherein the optimum recording power determined by the optimum recording power determining means and the temperature at that time, and the standard of standard data registered in the nonvolatile memory. A correction coefficient calculating means for calculating a temperature correction coefficient of the recording power from the respective differences between the recording power and the temperature at that time, and a temperature correction coefficient calculated by the means are used to write the temperature at that time and the optimum recording power. A magneto-optical disk device, comprising: a power correction unit that corrects the optimum recording power according to the difference from the temperature at which is determined to obtain the recording power for writing information.