JP2002222572A - Magnetic disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct misalignment of a magnetic head resulting from deformation of a load beam caused by heat generation of an IC and occurring at a suspension for mounting the IC on the load beam. SOLUTION: The IC is equipped with a temperature sensor. According to the temperature rise value measure by the temperature sensor, the quantity of misalignment of the magnetic head section is measured beforehand and recorded as a correction value and the heat misalignment of the magnetic head is corrected by running a micro-actuator according to the temperature measured in operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to a magnetic disk drive having two actuators, coarse and fine, and further having a control IC on a suspension supporting a magnetic head.

[0002]

2. Description of the Related Art As a prior art of the present invention, Japanese Unexamined Patent Publication No.
Japanese Patent Application Laid-Open No. 195215 discloses a magnetic head supporting mechanism having a two-stage actuator having an IC (Integrated circuit) mounted on a suspension in order to improve the reading / writing speed of the magnetic head. A configuration for preventing the IC itself from being damaged is disclosed. Further, as a conventional control method for compensating for a positional shift due to a temperature of a disk device using a head support mechanism of a one-stage actuator, there is a method disclosed in Japanese Patent Application Laid-Open No. 4-103850.

[0003]

SUMMARY OF THE INVENTION A chip-on-suspension (hereinafter referred to as CO2) in which an IC is mounted on a suspension.
S), the magnetic head may shift in the radial direction of the disk as the temperature of the IC rises.

In a magnetic disk drive equipped with a plurality of magnetic heads, when a certain magnetic head continuously reads or writes among a plurality of magnetic heads initially located in the same cylinder, the following is performed. Such a phenomenon occurs. When one magnetic head operates continuously, the temperature of the IC of the magnetic head rises. As a result, the suspension is deformed, and the continuously operating magnetic head and the other magnetic head (non-operating magnetic head) are shifted in the radial direction. The continuously operating magnetic head is servo-controlled and follows the same cylinder. In such a situation, when there is a head switching request to another magnetic head from a continuously operating magnetic head, the magnetic head that started operation by head switching is in a different cylinder from the cylinder of the magnetic head that was operating. , Lose their position. For this reason, it is necessary to read in the radial direction and read the position information recorded on the disk surface. As a result, there is a problem that the transfer speed is reduced because the data cannot be written or read immediately. Further, when servo information (position information) is written by an STW (servo track writer), there is a problem that tracks cannot be written at equal intervals due to thermal deformation.

An object of the present invention is to provide a plurality of suspensions on the same cylinder, and a single suspension on one suspension.
When a heating element such as C operates and is servo-controlled,
Even when reading / writing moves to another suspension,
It is an object of the present invention to provide a magnetic disk drive in which the transferred suspension can operate smoothly.

[0006]

In a magnetic disk drive having a microactuator for fine movement and an IC mounted on a suspension for amplifying read / write signals of a magnetic head, the magnetic disk drive is operated (when the magnetic head is used for reading). The temperature of the IC (during writing) is monitored by a sensor, and in accordance with a change in temperature (rising temperature), the position of the magnetic head of the suspension on which the IC whose temperature has been raised is mounted by the microactuator is increased. Correct according to. In other words, the amount of displacement of the magnetic head due to the temperature rise of the IC is corrected by the microactuator.
In this correction, the sensor detects a rise in the temperature of the IC and corrects the displacement by an amount corresponding to the rise in temperature. The temperature rise and the amount of displacement may be measured in advance by experiments or the like, and corrected using this table. Further, the correction table of the magnetic head (the rise temperature and the displacement correction amount of the magnetic head) due to the temperature rise of the IC may be written in the IC in advance.

When writing information continuously, as in the case of STW, the IC is preheated before reaching the temperature for continuous writing before writing information. Then, the heating is stopped when the writing is started. As a result, the temperature of the IC before and after writing is kept constant, so that the temperature rises with the lapse of time after the start of writing, and thermal displacement of the magnetic head generated in the process can be eliminated. Thus, servo information can be written at a uniform track pitch. (Also, if the temperature of the IC is maintained at the temperature at the time of continuous writing or continuous reading, the amount of thermal displacement of the magnetic head can be kept constant. The thermal displacement of the magnetic head caused by the rise is eliminated.) Further, by providing a control means for detecting the temperature of the IC and maintaining the temperature at a predetermined value, a uniform track pitch from the inner circumference to the outer circumference of the disk is provided. Can record servo information. This is because the inner and outer peripheries of the disk have different cooling velocities at the inner and outer peripheries due to different air flow velocities. Therefore, when heating is performed with the same heat generation amount, I
The temperature of C differs between the inner and outer circumferences of the disk, which results in a problem that a uniform track pitch cannot be written. However, by providing control means for keeping the temperature of the IC constant, the thermal displacement becomes constant at the inner and outer circumferences of the disk, so that servo information can be recorded at a uniform track pitch. Therefore, the positioning accuracy is improved, and the quality of R / W is improved. As a result, a high recording density becomes possible.

[0008]

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

FIG. 1 is a perspective view of a magnetic disk drive to which the present invention is applied, FIG. 2 is a perspective view of its suspension,
FIG. 3 is a side view of the suspension, and FIG. 4 is a top view of the suspension.

In FIG. 1 to FIG. 4, a slider 3 having a magnetic head 22 mounted thereon is mounted via a flexure 2 at the tip of the load beam 1. Also load beam 1
The IC 20 for amplifying the read / write signal of the magnetic head 22 (hereinafter referred to as a magnetic head I
C). This magnetic head IC2
0 is provided with a temperature detecting means (sensor). As the temperature detecting means, a sensor for detecting the temperature from the change in the resistance value is mounted, although the resistance value changes due to the change in the temperature of the semiconductor diode. As the temperature detection sensor, a sensor attached to the surface of the IC, such as a thermocouple, may be used instead of the semiconductor diode.

The load beam 1 is fixed to the micro-actuator mounting section 4 and the micro-actuator mounting section 4 is fixed to the mount 5 by welding or the like. Further, the mount 5 is fixed to the carriage 6 by caulking or the like. Carriage 6
By rotating around the pivot shaft 7, any radial position on the disk 8 can be accessed. Further, a microactuator 9 composed of a piezoelectric element is fixed to the microactuator mounting section 4. The hatched portions in FIG. 2 indicate locations where the microactuator 9 is fixed. The place where this actuator is fixed may be processed to be lower than the surrounding plane by ordinary etching or the like in order to make it easy to mount the actuator.

The microactuator mounting section 4 includes an arm section 4
1 and a magnetic head side microactuator fixing part 42 and a carriage side microactuator fixing part 43. The arm portion 41 is arranged outside the center line in the longitudinal direction so as not to contact and slide with the microactuator 9, and has an outwardly convex shape so as to be flexible enough not to hinder the operation of the microactuator 9.

FIG. 5 is a sectional view of the microactuator 9 and the microactuator mounting section 4. Arrows in the figure indicate the polarization direction of the microactuator 9 formed of a piezoelectric element. The microactuator 9 is provided with an upper electrode 10 and a lower electrode 11, and is fixed to the microactuator mounting section 4 by a conductive adhesive 12. The microactuator mounting section 4 is electrically at zero potential via the mount 5 and the carriage 6. Thus, when a signal is input to the upper electrode 10 as shown in FIG. 5, since the polarization directions of the two microactuators 9 are opposite, the expansion and contraction directions of the two microactuators 9 are opposite.

As a result, as shown in FIG. 6, for example, the microactuator 91 deforms to contract in the longitudinal direction and the microactuator 92 deforms to expand in the longitudinal direction. With such deformation, the slider 3 can be finely moved in the radial direction of the disk.

FIG. 10 shows the relationship between the temperature rise obtained by experiments and the displacement of the magnetic head. In this experiment,
A 3.5-inch single plate is used, and a thermal evaluation IC (hereinafter referred to as TEG) incorporating a heating element capable of controlling the amount of heat generated and a temperature sensor utilizing a resistance change due to the temperature of the diode is used as the IC. . The TEG was performed using a suspension mounted on a load beam. The displacement of the magnetic head in the radial direction was measured by a laser displacement meter. It can be seen from the figure that the magnetic head fluctuates in the radial direction as the temperature rises. More specifically, the temperature fluctuates by about 0.8 μm with a temperature rise of 40K. The relationship between the temperature rise and the displacement is proportional, and the higher the temperature rise, the greater the displacement. In this embodiment, the relationship between the temperature and the deformation of the head portion (the relationship between the temperature and the driving amount of the microactuator) is measured in advance,
It is also possible to record and drive the microactuator according to the measured temperature.

FIG. 11 shows a problem that occurs when a certain magnetic head of a plurality of magnetic heads arranged in the same cylinder performs continuous reading or writing in a magnetic disk drive having a plurality of magnetic heads mounted thereon. Shown in In the figure,
Focusing on the two heads, one of the magnetic heads 2
Consider a case where 2a is operated continuously (read and write). Before the operation of the magnetic heads, the two magnetic heads 22a and 22a
2b are located on the same cylinder 15. Next, when the magnetic head 22a operates continuously, the temperature of the IC of the magnetic head rises. As a result, the suspension is thermally deformed, and the continuously operating magnetic head 22a and another magnetic head (the inactive magnetic head 22b) are shifted in the radial direction (FIG. 11B). Since the positioning of the magnetic head 22a is controlled, the magnetic head 22a follows the same cylinder 15. In this situation, when there is a head switching request from the personal computer to the other magnetic heads 22b due to data change from the continuously operating magnetic head 22a,
Magnetic head 22b started operation by head switching
Is located at a different radial position from the cylinder of the magnetic head 22a that has been operating, so that its position cannot be known. Therefore, it is necessary to seek in the radial direction and read the position information recorded on the disk surface. As a result, data cannot be written or read immediately, so that the transfer speed is reduced. The present invention has been made to solve the above problems, and a method of correcting the same will be described below with reference to FIG.

FIG. 7A shows a state before the magnetic head operates, that is, a state in which there is no heat generation (temperature rise) of the IC. The magnetic head reads data continuously,
Alternatively, when writing is performed, the IC generates heat and the magnetic head moves in the radial direction (FIG. 7B). In our experiment, the magnetic head is displaced toward the inner circumference of the magnetic disk due to the rise in the temperature of the IC. Although the magnetic head is under the load beam and cannot be seen directly, it is considered that the load beam is deformed as shown in the figure and the magnetic head moves. When the magnetic head moves in the inner circumferential direction of the disk due to heat generated by the IC, the microactuator is driven in the opposite direction (FIG. 7 (3)) to move the magnetic head to a position before thermal displacement occurs. , And accurate positioning can be achieved.

For this reason, immediately after the end of the continuous reading or writing, even if the magnetic head, which has been suspended, has a head change, the magnetic head shown in FIG.
As described in 1, there is no displacement due to thermal displacement. For this reason, even if the magnetic head that has generated heat from the IC has a head change to the magnetic head that has been paused (the IC has not generated heat), the position of the cylinder (track) cannot be determined for the magnetic head that has been paused. There is nothing. This eliminates the need for the magnetic head to seek and read the servo information, which is performed when the position information is lost due to thermal displacement. As a result, the above-described seek time and the accompanying waiting time can be eliminated, so that high-speed data access can be realized. FIG. 8 is a block diagram for correcting a displacement caused by a temperature change due to heat generation of the IC 20. Magnetic disk and personal computer (P
C) 30 transmits and receives data via the HDD controller 31. When writing data, the HDD controller 31 sends the data to the data read / write controller 32, amplifies the signal with the magnetic head IC 20, and records the data on the magnetic disk surface with the magnetic head 22. At the time of reading data, the data is read from the magnetic disk and transmitted to the PC 30 via the HDD controller 31 in a procedure reverse to that at the time of writing. The controller 33 of the microactuator 9 includes the magnetic head IC 20
When the magnetic head is thermally displaced due to the heat generated by the micro-actuator 9 according to the temperature information sent from the temperature sensor 35 attached to the IC 20 for the magnetic head.
Is driven so that the magnetic head 2 is displaced in the direction opposite to the thermal displacement to correct the thermal displacement. Therefore, there is no displacement between the operating magnetic head and the paused magnetic head due to a rise in the temperature of the IC. Thus, even if there is a head change between the two magnetic heads, there is no displacement between them, so that the magnetic head does not perform a seek operation for detecting servo information. It is also possible to store the relationship between the temperature rise of 1C and the amount of displacement of the magnetic head (the amount of correction) in an IC, and make a correction by referring to the amount of correction by the controller of the microactuator. Thereby, there is an advantage that work such as storing the relationship between the temperature rise and the correction amount in the PC or the HDD controller is not required.

Also, at the time of STW, tracks can be written at equal intervals, so that the quality of the positioning signal (servo signal) can be improved. For this reason, it is possible to increase the track density and improve the reliability in reading and writing data.

FIG. 9 shows another method of correcting the thermal displacement of the magnetic head. The correction in FIG. 8 is a method of eliminating the displacement by moving the magnetic head 22a displaced by the heat generated by the IC 20a in the opposite direction by the microactuator 9a. On the other hand, FIG.
Is corrected by applying the same amount of displacement as the magnetic head 22a displaced by the heat generated by the IC 20a to the magnetic head 22b at rest (there is no heat generated by the IC), This is a method in which a magnetic head 22b that does not exist is followed. Specifically, in FIG. 9, there are two magnetic heads 22a and 22b and microactuators 9a and 9b for moving the respective magnetic heads, and these are distinguished by subscripts a and b. The suffix a indicates the head that has been operating until now, and the suffix b indicates the head that is to be operated. Here, the difference from FIG.
The measurement result of the IC temperature sensor 35a provided in the magnetic head 22b is input to the controller 33b of the microactuator 9b of the magnetic head 22b.
Of the temperature of the IC 20b for use by the temperature sensor 35b (the ICs 20a and 20b of the magnetic head 22a and the magnetic head 22b).
b) by moving the magnetic head 22b by the microactuator 9b according to the temperature difference of the magnetic head 22a.
Is to follow. This results in the same result as the method of FIG. 8, that is, the magnetic head 22a and the magnetic head 22.
b can eliminate the displacement caused by the heat generated by the IC 20a. In the method of FIG. 8, it is necessary to continuously drive the microactuator 20b in response to a temperature rise during reading and writing. That is, since the temperature increases during reading and writing, it is necessary to continuously drive the microactuator 20b according to the temperature rise. However, since apparently no thermal displacement of the magnetic head occurs, the STW
This is suitable for writing tracks at regular intervals, as shown in FIG.

On the other hand, in the method shown in FIG. 9, the magnetic head 22a which has been operating until the magnetic head 2b which has been suspended
Only when the head is changed, both ICs 20a, 2a
The temperature difference of 0b may be measured, and the head 22b, which has been in the idle state, may be driven by the amount of thermal displacement and canceled. For this reason, it is not necessary to continuously drive the microactuator 20b, and control is facilitated. Further, it is possible to reduce power consumption and extend the life of PZT. When the relationship between the temperature rise and the amount of displacement differs between the magnetic heads, individual control may be performed in consideration of not only the temperature difference but also the amount of displacement of each magnetic head.

8 and 9 may be selected according to the magnetic disk drive.

Next, a preheating method for solving the problem that servo information cannot be written at a uniform track pitch due to thermal displacement during STW will be described with reference to the block diagram of FIG. The difference between FIG. 12 and FIG. 8 is that a controller 40 for preheating the IC 20 is provided instead of the microactuator controller 33 of FIG. 8 have the same reference numerals as those in FIG. The preheating controller 40 includes the R / W controller 3
2 receives an information write signal from the magnetic head 22.
Before writing position information in the radial direction of the magnetic disk,
The magnetic head IC 20 is heated (preheated). Magnetic head I
The heating of C20 is performed by applying the same current to the IC 20 as at the time of writing and actually performing dummy writing on the magnetic disk by the magnetic head 22. The position of the dummy write may be a position where the actual position information is written, or any position on the magnetic disk surface. When dummy writing is performed at a position where actual position information is to be written, regular servo information may be overwritten after dummy writing. The preheating time may be about several seconds to ten seconds after the current starts to flow to the IC (after the start of heating).
This was clarified by our experiments. Heating caused the temperature to rise, resulting in thermal displacement of the magnetic head,
After the temperature becomes constant, until the thermal displacement becomes constant,
Thermal response time. After heating for the predetermined time by the preheating controller 40, the magnetic head 22 starts writing position information on the magnetic disk. A controller for moving the magnetic head 22 in the radial direction is not shown. The servo information is written by changing the magnetic head in the radial direction by the coarse movement actuator shown in FIG. This preheating method is a method for preventing the temperature from rising at the start of writing and causing thermal displacement of the magnetic head.

Next, a method for solving the problem that the temperature of the IC differs due to the difference in the air flow velocity depending on the radial position of the disk at the time of STW and the track cannot be written at a uniform track pitch will be described with reference to FIG. The difference between FIG. 12 and FIG. 13 is that, in FIG.
The point is that a temperature controller 45 is provided, and a temperature sensor 35 for detecting the temperature of the magnetic head IC 20 is provided. The function of each unit during STW will be described. The magnetic head 22 is moved from the outer periphery to the inner periphery of the magnetic disk by the positioning means. The R / W head is positioned on the magnetic disk surface at each radial position, and writes servo information to the magnetic disk. The temperature sensor 35 senses the temperature of the magnetic head IC 20 at each radial position and transmits the temperature to the temperature controller 45. The temperature controller 45 is an IC 20
Is controlled so that the temperature of the IC 20 is always constant. If the temperature of the IC 20 is lower than the predetermined temperature, the IC 20 is heated, and after reaching the predetermined temperature,
In cooperation with the R / W controller 32, a signal is sent from the controller 32 to the magnetic head IC 20, and the magnetic head 22 writes servo information on the magnetic disk surface. When the temperature of the IC 20 becomes higher than the predetermined temperature, the writing is stopped for a while, and the R / W controller 32 is controlled so that the magnetic head 22 does not write the servo information until the IC 20 is cooled to the predetermined temperature. And the writing of servo information is controlled in cooperation with. As described above, before the magnetic head 22 writes the servo information, the temperature sensor 3
5, the temperature of the IC 20 is detected, and the temperature of the IC 20 is controlled by the temperature controller 45 so as to reach a predetermined temperature. Thereafter, after confirming that the temperature of the IC 20 has reached a predetermined temperature, the magnetic head 22 writes the positioning information. This eliminates the problem that the temperature of the IC 20 changes depending on the radial position of the magnetic head 22, thereby changing the amount of thermal displacement of the magnetic head 22. Thus, the thermal displacement of the magnetic head becomes constant over the entire circumference of the magnetic disk. Therefore, servo information can be written at a uniform track pitch. Therefore, the positioning accuracy is improved, and the quality of R / W is improved. As a result, a high recording density becomes possible.

[0025]

According to the present invention, the displacement of the magnetic head caused by the heat generated by the IC can be corrected by the two-stage actuator (microactuator). Since it can be eliminated, the data access speed does not decrease. Further, since the positioning performance of the magnetic head can be improved, the read / write reliability of the magnetic disk device can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic disk drive according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the suspension according to the first embodiment of the present invention.

FIG. 3 is a side view of the suspension according to the first embodiment of the present invention.

FIG. 4 is a top view of the suspension according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a microactuator and a microactuator mounting portion according to the first embodiment of the present invention.

FIG. 6 is a modified view of the first embodiment of the present invention during operation of the microactuator.

FIG. 7 is an explanatory diagram of a magnetic head thermal displacement correction mechanism of the present invention.

FIG. 8 is a conceptual diagram of magnetic head thermal displacement correction according to the present invention.

FIG. 9 is a conceptual diagram of different magnetic head thermal displacement corrections of the present invention.

FIG. 10 is a diagram showing a relationship between a temperature rise of an IC and a displacement of a magnetic head.

FIG. 11 is a diagram showing a problem when thermal displacement of the magnetic head occurs.

FIG. 12 is a block diagram for preheating IC before STW.

FIG. 13 is a block diagram for controlling the temperature of the IC to be uniform over the entire circumference of the disk during STW.

[Explanation of symbols]

1 ... load beam, 2 ... flexure, 3 ... slider, 4
… Micro actuator mounting part, 5… Mount, 6…
Carriage, 7: pivot shaft, 8: disk, 9: microactuator, 20: IC, 30: preheating controller, 40: temperature controller.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Hiromitsu Masuda 502 Kandachi-cho, Tsuchiura-shi, Ibaraki Inside Machinery Research Laboratory, Hitachi, Ltd. F term in the system division (reference) 5D042 LA01 MA15 NA01 PA10 TA09 5D059 AA01 BA01 CA29 DA19 DA36 DA38 EA08 5D096 NN03 NN07 NN07 VV01

Claims (12)

[Claims] 1. A magnetic disk for recording information, a magnetic head for writing and reading information to and from the magnetic disk, a suspension for supporting the magnetic head, a carriage for holding the suspension, and via the carriage A magnetic disk drive comprising: a coarse actuator for largely moving the magnetic head, a microactuator for finely moving the head, and an IC on the suspension for amplifying read / write signals of the magnetic head; A magnetic disk drive, comprising: a detector for detecting the temperature of the IC during reading and writing of information by a head; and a control unit for driving and controlling the fine movement actuator in accordance with a detection value of the detector. . 2. The magnetic disk drive according to claim 1, wherein a relationship between the temperature of the IC and the amount of movement of the magnetic head is obtained in advance, and stored in the control unit in a table format, and the detection of the detector is performed. A magnetic disk drive characterized in that control is performed using values in the table from values. 3. The magnetic disk drive according to claim 1, wherein the control unit drives the micro-actuator according to the temperature of the IC to perform the position correction control of the magnetic head.
A magnetic disk drive characterized in that it is from immediately after the start of reading / writing of a magnetic head to the end. 4. The magnetic disk drive according to claim 1, wherein the vicinity of the tip of the air latch receiving the wind is linear, and an extension of the straight line is directed toward the rotation axis of the magnetic disk. 5. A magnetic disk drive according to claim 1, wherein said temperature detector utilizes a change in resistance value of the semiconductor diode incorporated in said IC with a change in temperature. apparatus. 6. A magnetic disk for recording information, a magnetic head for writing / reading information to / from the magnetic disk, a suspension for supporting the magnetic head, a carriage for holding the suspension, and via the carriage A magnetic disk drive comprising: a coarse actuator for largely moving the magnetic head, a microactuator for finely moving the head, and an IC on the suspension for amplifying read / write signals of the magnetic head; A head for detecting a temperature of the IC during reading and writing of information by the head; and controlling the fine actuator according to a detection value of the detector while the magnetic head pauses reading and writing to control the fine actuator. A magnetic disk having a control unit for correcting the position of the magnetic disk. Device. 7. A magnetic disk for recording information, a magnetic head for writing / reading information to / from the magnetic disk, a suspension for supporting the magnetic head, a carriage for holding the suspension, and via the carriage A magnetic disk drive comprising: a coarse actuator for largely moving the magnetic head, a microactuator for finely moving the head, and an IC on the suspension for amplifying read / write signals of the magnetic head; A magnetic disk drive, comprising: a detector for detecting a temperature of the IC during reading and writing of information by a head, and storing a deviation between the temperature of the IC and a position of a magnetic head in the IC. 8. The magnetic disk drive according to claim 1, further comprising an ambient temperature detector for detecting an ambient temperature around an IC, and detecting a difference between the IC temperature and the ambient temperature. A magnetic disk drive characterized by controlling an actuator for fine positioning of a magnetic head using the same. 9. A magnetic disk for recording information, a magnetic head for writing / reading information to / from the magnetic disk, a suspension for supporting the magnetic head, a carriage for holding the suspension, and via the carriage A magnetic actuator for coarsely moving the magnetic head, a microactuator for finely moving the head and an IC mounted on the suspension for amplifying read / write signals of the magnetic head; A detector for detecting the temperature of the IC and a heating means for heating the IC are provided, and after the temperature of the IC detected by the detector reaches a predetermined temperature, the information is written or read (writing). Or a read control unit). 10. A magnetic disk for recording information, a magnetic head for writing / reading information to / from the magnetic disk, a suspension for supporting the magnetic head, a carriage for holding the suspension, and via the carriage A magnetic actuator for coarsely moving the magnetic head, a microactuator for finely moving the head and an IC mounted on the suspension for amplifying read / write signals of the magnetic head; And a heating means for heating the IC. During the operation of the magnetic disk drive, the IC is heated so that the temperature of the IC detected by the detector is maintained at a predetermined temperature. A magnetic disk drive comprising a temperature control unit of an IC to perform. 11. A magnetic disk for recording information, a magnetic head for writing / reading information to / from the magnetic disk, a suspension for supporting the magnetic head, a carriage for holding the suspension, and via the carriage A magnetic actuator for coarsely moving the magnetic head, a microactuator for finely moving the head and an IC mounted on the suspension for amplifying read / write signals of the magnetic head; And a heat generating means for generating heat by consuming the same electric power as at the time of writing or reading. A magnetic disk drive comprising a heating control unit for heating for a time. 12. The magnetic disk drive according to claim 11, wherein the heating time of the heating control section is set to several seconds to about 10 seconds.