JPH0432474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the positioning of a head device on a recording track in an information recording medium drive device that drives an information recording medium to record/reproduce information.

[Conventional technology]

Various types of disk drive devices are known for recording and/or reproducing information by rotationally driving an information recording medium, for example, a disk-shaped magnetic recording medium (hereinafter referred to as a magnetic disk). However, especially for small-sized devices that require a large amount of information, disk drive devices, also called hard disk devices, are often used. This hard disk device rotates a magnetic disk, which has a magnetic recording layer formed on the surface of a hard disk, at high speed, and makes a magnetic head levitate above the surface of the magnetic disk to perform recording/reproduction.

An example of this type of disk drive device is shown in FIG. In the figure, the disk drive device includes a magnetic disk 1 for recording information, a magnetic head 2 for recording/reproducing information on the magnetic disk 1,
A direct drive motor (not shown) that rotationally drives the magnetic disk 1 (hereinafter referred to as DD motor), a head drive mechanism 4 that moves the magnetic head 2 to a predetermined track on the magnetic disk 1, and a magnetic disk. A base plate 5 serves as the base of a casing that accommodates the magnetic head 1 and the magnetic head 2 and holds them in a sealed state, a printed circuit board 6 on which a motor drive circuit, a control circuit, etc. are formed, and the printed circuit board 6 is attached to the base plate 5. It mainly consists of a frame (not shown).

In this magnetic disk device, two magnetic disks 1 are provided, and since double-sided recording is performed on one magnetic disk 1, one magnetic head 2 is provided on each side, a total of four magnetic heads 2. It is attached to the swing arm 8 of the head drive mechanism 4 via a cantilevered support spring. Head drive mechanism 4
is this swing arm 8 and swing arm 8
A steel belt 9 attached to a part of the steel belt 9 and a pulley 10 around which the middle part of the steel belt 9 is wound.
and a stepping motor 11. The pulley 10, around which the steel belt 9 is wound, is inserted and fixed into the drive shaft 12 of the stepping motor 11, and by driving the stepping motor 11, the swing The arm 8 is swingable about a rotating shaft 8a.

The housing that houses the magnetic disk 1, magnetic head 2, swing arm 8, steel belt 9, pulley 10, etc. consists of the base plate 5 and a top cover (not shown), and in order to maintain airtightness,
A gasket is used at the contact portion between the base plate 5 and the top cover and at the mounting portion of the stepping motor 11, and the shaft portion of the DD motor is filled with magnetic fluid. Further, a shutter 17 is provided on the antimagnetic head mounting side 8b of the swing arm 8 so as to protrude outward. Furthermore, a photointerrupter 18 is provided as an outside sensor on the airtight chamber 5a side of the base plate 5, and the shutter 17 is inserted into the insertion path 18a of the photointerrupter 18.
It is arranged so that it can be inserted loosely. In this conventional example, when the magnetic head 2 reaches the O-track position on the outer periphery, the shutter 17 blocks the optical path formed in the insertion path 18a of the photointerrupter 18.

By the way, as mentioned above, the stepping motor 1
1 to transport the magnetic head 2, positioning of the head becomes difficult as the density increases. In other words, in hard disk drives, since the materials inside the drive have different expansion coefficients, there is a problem called thermal off-track, where the position of the magnetic head 2 relative to the track shifts due to temperature changes. In general, when it exceeds 400 TPI, it becomes difficult to position the magnetic head 2 without using a servo.

One of the control methods using this servo is
There is an invention disclosed in No.-86910. This invention is
One data-masked servo sector containing track centerline servo control data readable by the head is used to position the head from servo information once per revolution of the magnetic disk. Therefore, in this type of servo control system, the data recording area becomes shorter by the amount of servo information, so the rotation speed is slightly lowered to adjust the transfer speed. For this reason, there is a possibility that the head may become slightly unstable.

Another control method using servos is to use the innermost and outermost tracks as dedicated servo tracks. This method uses the inside diameter
Abbreviation for Outside Diameter
This is called the ID-OD method. In this system, the disk drive first reads the outer servo track and makes fine adjustments so that the head is centered on the track. The head is then moved toward the inner servo track. At this time, the number of step pulses of the stepping motor of the head drive mechanism is counted, and when the head reaches the inner servo track, the head positioning mechanism performs precise positioning so that the head is in the center of the track. . Then, during precise positioning of each servo track, the positioning mechanism learns the amount of correction needed to find the center of the track. Once this correction is known, the positioning mechanism can calibrate the exact position of each track with information about the number of step pulses required to move between the outer and inner tracks and the amount of microstep correction required on each servo track. It is becoming possible to do so.

However, with this method, the positioning mechanism has to repeat the calibration procedure every time a positioning error occurs, so if this happens frequently, a lot of time is wasted that is not directly related to recording/playback. , the utilization efficiency of the disk drive device decreases. Also, once the head is on the data track, there is no guarantee that the head will remain in the correct position since there is no means for readjustment.

For these reasons, the present applicant has realized that there is no need to reduce the rotation speed, and the head can be positioned at an accurate track position (fine track position) by reading servo information at any time, resulting in an efficient system with less wasted time. In Japanese Patent Application No. 140351/1987, we proposed a head positioning control method that can provide a disk drive device with a high level of performance.

The proposed invention relates to a method for positioning a head device with respect to a recording track in a recording medium drive device that writes or reads signals to or from a recording track on an information recording medium via a head device. It is structured as follows.

First, if a stepping motor is used as the motor for moving the head of the information recording medium, the preset number of adjacent tracks is the same as the number of steps corresponding to 1/2 cycle of the stepping motor. For example, one (pair) or several (pairs) of servo information is assigned in correspondence with an internal index signal to form a servo track. At the time of writing or reading, the head device is moved from the recording track to be written or read to the servo track to which servo information has been attached at any time, the servo information is read out, and the servo information that has been read is used to drive the head device's transport motor. The supplied drive voltage is controlled to position the head device at a fine track position with respect to the servo track. Thereafter, the head device is returned to the recording track before being moved, and the head device is positioned at the fine track position of the target recording track based on the fine track position positioning information with respect to the servo track. This is intended to make it possible to always achieve a fine track within a desired range during writing and reading.

On the other hand, ST-506 is a magnetic disk that uses a floppy-like format as an interface with the coin controller of the disk drive device.
Interfaces called compatible are often used. In the floppy-like format, there is an index at one location for each round of one track, and data is handled by dividing the area from index to index into a large number of sectors. A gap is provided between the indexes, and
The format is such that a gap for absorbing rotational fluctuations, which is longer than the other gap, is provided between the last sector and the index.

[Problem that the invention seeks to solve]

By the way, in the above ST-506 interface,
There is no means to inform the disk drive side whether the controller is reading the data signal output from the disk drive device. Therefore, if the disk drive device transfers the magnetic head to a track having servo information and performs predetermined positioning control or updates of the positioning information during reading, an error may occur on the controller side. In other words, when reading from one track by moving from one track to another, with a servo track system, when seeking from one track to another track, the servo track is used to calibrate the position, and When moving to the track, the controller issues a seek complete signal indicating that the seek operation has finished, and after receiving the seek complete signal, the read operation is performed. Don't judge. However, when the disk drive device issues a servo command and causes the head to seek to the servo track while reading data continuously from one track, the controller side is expecting read data to be sent. Since it is no longer sent, there is a very high possibility that it will be determined as an error.

In addition, with the servo sector type, when the tracks are located on the same track, servo correction is performed at least every revolution, but servo correction is not performed at all for other tracks, so a seek command is issued. If you try to seek to the desired track, there is a high possibility that you will go off-track.

Furthermore, in the ID-OD system, as long as the recording track is on the recording track, there is no means for correcting even if thermal off-track occurs, which may impede reading/writing.

This invention was made in view of the above-mentioned technical background, and its purpose is to enable servo correction that minimizes the effects of thermal off-track, and to connect the ST-506 interface to a servo system. The object of the present invention is to propose a head positioning control method that can be used in any situation.

[Means for solving problems]

In order to solve the problems faced by the prior art and achieve the above object, the present invention provides a recording medium drive device that writes information to or reads information from a recording track on an information recording medium via a head device. A method for positioning the head device with respect to a recording track includes, at least at preset intervals, seeking the head device from that track to another track at a final gap position following the last sector of the track on which the head device is located. The servo information written in advance is read out for each target track, the positioning information of the head device stored in the storage device is updated based on the read servo information, and then the head device is transferred to the track before movement and separately. Seek to any of the target tracks that received the seek command, position the head device at the fine track position for the sought track, and respond to the command from the final gap position by either a write or read command. The structure is such that it can perform various actions.

[Effect]

The above means works as follows.

That is, when a preset time elapses while writing or reading information on one track, or when neither writing nor reading is performed, it becomes difficult to read servo information to the preset track. Then, the head device is positioned based on this servo information, and the positioning information at this time is stored as a storage means.
Store it in a RAM (Random Access Memory) table, perform similar positioning for a preset number of tracks, for example, the number of tracks corresponding to 1 cycle or 1/2 cycle of the stepping motor, and update the RAM table. . During this update, seek is performed from the track to the target track position at the final gap position following the final sector of the track where the head device is located. This allows the recording track to be removed from the recording track without being judged as an error by the controller.

When the update is completed, the head device is caused to seek to the original track or the target track, and the head device is positioned at the fine track position of the recording track based on the servo information.
Thereafter, when the head device is located at the final gap (for example, detected using an internal index), it is returned to the read state before the seek. During this time, even if valid read data is not sent, the controller side is not in a control state to read normal read data, so it will not be determined as an error. Furthermore, when normal read data is restored, normal steps are taken after passing through the external index and the first gap, so that no error is determined in this case either. Note that while seeking to this servo track, in order to prevent data separator followability problems and errors caused by incorrect data reading by the controller, send dummy data and avoid sending index pulses to the controller. By making the seek complete signal inactive, it is possible to avoid controller timeout (error check when there is no data within a certain period of time).

〔Example〕

Hereinafter, an example of implementation of the present invention will be described based on the drawings.

1 to 6 are for explaining an embodiment of the present invention. FIG. 1 is a flowchart showing the procedure for seek and head position calibration using the final gap, and FIG. 2 is a track format. FIG. 3 is a block diagram showing the control system of the disk drive device according to the embodiment, the fourth line is an explanatory drawing showing the recording track of the magnetic disk and the writing state of the servo signal, and FIG. FIG. 6 is a block diagram showing an example of a servo circuit.

Further, the disk drive device itself is the same as the conventional example shown in FIG. 7, and in the following description, the same reference numerals are given to the constituent elements that are the same or can be considered to be the same as those of the conventional example.

In FIG. 3, the control system of the disk drive device includes a DD motor 3 that rotationally drives the magnetic disk 1.
and the stepping motor 11 that drives the swing arm 8, and a drive circuit 22 that sends and receives signals to and from the head amplifier 21.
It is mainly composed of a servo circuit 23 that processes servo information amplified by the servo circuit and sends an electric signal related to servo control to the drive circuit 22, and a controller 25 that controls the drive circuit 22 via an interface 24. ing. The controller 25 and host computer 26 are connected by a bus 27, and are capable of processing signals detected by the magnetic head 2 or signals sent to the magnetic head 2.

FIG. 5 shows a servo track formed on the magnetic disk 1 and a recording track to which no servo information is attached. The magnetic disk 1 is, for example, a thin aluminum plate coated with a magnetic coating, and has an inhibit zone I where no data is written on the innermost circumference, and a data burn D on the outer circumference. . In the data zone D, 600 or more recording tracks T are formed in a concentric cylinder, and the data zone D is divided into approximately three parts, each of which has a group of four tracks as shown in FIG. A group of servo tracks is formed. The servo track groups are the servo track group OST on the outer periphery, and the servo track group OST on the middle part.
MST and inner servo track group IST, and each servo track group OST, MST, IST includes
Servo zone OSZ ₁ , where the servo signal F is written as servo information with a 180 degree misalignment.
OSZ ₂ , MSZ ₁ , MSZ ₂ , ISZ ₁ and ISZ ₂ are formed.

FIG. 4 is an explanatory diagram of a servo track group MST formed, for example, in the middle part, and the servo track group MST includes four servo tracks MST ₁ ,
It is composed of MST ₂ , MST ₃ , and MST ₄ . and,
Each servo track MST ₁ , MST ₂ , MST ₃ ,
In MST ₄ , servo signals F are staggered at the same frequency at positions equidistant about the center line C in the longitudinal (circumferential) direction, corresponding to the first and second internal index signals IN ₁ and IN ₂ . are written alternately. And this is the above servo zone MSZ ₁ ,
It is equivalent to MSZ ₂ . In this case, since the servo signal F is written in the same magnetic head 2, the servo signal F, the recording track T, and the servo track
The track widths _MST1 to _MST4 match the length of the gap G of the magnetic head 2, and off-track occurs when the position of the gap G of the magnetic head 2 deviates from the target recording track T.

In this example, servo zone OSZ ₁ and
The reason why OSZ ₂ , MSZ ₁ and MSZ ₂ , and ISZ ₁ and ISZ ₂ are formed with a phase shift of 180 degrees is due to the convergence time for position correction of the magnetic head 2 and the rotation rate per rotation of the magnetic disk 1. This takes rotation time into consideration. In other words, the time required for one rotation of the magnetic disk 1 is approximately 16.67 msec at 3600 rpm.
The convergence time after driving the stepping motor 11 is approximately
It is 8msec. Therefore, if the servo zones are out of phase by 180 degrees, for example, the servo zones OSZ ₁ , corresponding to the first internal index signal IN ₁ ,
The servo signal F of MSZ ₁ and ISZ ₁ is read out and the position is corrected, and immediately after the correction operation converges, the servo zone corresponding to the second internal index signal IN ₂ is read out.
By reading out the servo signals F of OSZ ₂ , MSZ ₂ , and ISZ ₂ , it is possible to detect whether the correction operation is appropriate. In this case, since the rotation time per rotation of the magnetic disk 1 and the convergence time of the stepping motor 11 are in the above relationship, the phase of the servo zone is
Two servo zones are provided per revolution, shifted by 180 degrees.
Needless to say, various selections can be made depending on the speed collection time of the positioning operation of the drive motor or other types of drive motors and the rotational speed of the recording medium. However, even if the motor configuration etc. is different, it is considered that the provision of one or several servo zones per revolution will function satisfactorily.

The reason why four servo tracks are arranged in one group is to take into account errors in the formation interval of the magnetic pole teeth of the stepping motor 11 and errors in the magnetization interval of the rotor. In other words, when using a 4-phase unipolar type or 2-phase bipolar stepping motor, 4 steps can be performed with 1-phase excitation and 4 steps with 2-phase excitation.
A total of 8 steps constitutes one cycle. At this time, it is known that the rotation angle error due to the excitation phase shows the same pattern every 1/2 cycle. Therefore, if it is possible to correct only the four tracks corresponding to 1/2 period by matching the rotation angle and excitation voltage, it is possible to excite the same excitation phase and the excitation phase shifted by 1/2 period. Sometimes, the control conditions are the same for every fourth recording track T.

Figure 2 is an example of a typical format.
Corresponding to the external index signal EIN shown in Fig. 4, the distance from gap IG ₁ to gap 4G ₄ is 32
Divided into sectors.

Gap 1G ₁ is external index signal EIN
It is provided to absorb the deviation of the
“4E” is written with a length of 16 bytes. The sync field (VFO Sync field) SF ₁ following the gap 1G ₁ is used to lock the controller's VFO (PLO) prior to address search. The data is all "0", that is, only the clock. The ID field following the sync field contains the address mark, cylinder, head, sector, and check code for this area. The gap 2G ₂ following the ID field ID is called the light space gap.
When writing to data field DF,
At this point, the read state switches to the write state,
This is to provide the switching time. The sink field SF ₂ following the gap 2G ₂ is the ID
Functions the same as the sink field SF ₁ at the beginning of the field ID, but the data field that follows
It can be rewritten by the write clock at the same time as DF.
Then, in the data field DF that follows,
Data is written. data field DF
Following this, there is a gap 3G ₃ . Gap 3G ₃ is also called an inter-record gap, and is a gap that occurs when the DD is in the process of writing to the previous sector S.
Since there is a possibility that the next selector S may be destroyed due to fluctuations in the rotation of the motor 3, etc., it is formed to have a predetermined length. For example, 32 sectors are provided, with one sector S extending from the sync field _SF1 at the beginning of the ID field ID to this gap _3G3 . Gap 4G ₄ as the final gap is
Gap 1 Gap 3G Continuing from Gap ₃ for sectors ₁ to 32, and external index signal
For example, a predetermined signal such as "4E" is written until EIN is detected. This gap _4G4 copes with speed fluctuations of the DD motor 3, and is also called a speed tolerance gap.

This gap 4G ₄ is also a traditional above-mentioned
In the 256 byte x 32 sector format, it is 352 bytes, which is approximately 4.1% of the total number of bytes. In reality, it fluctuates due to speed fluctuations of the DD motor 3, and a predetermined region near the gap _1G1 side is used for seek in servo control.

Furthermore, the external index signal EIN corresponding to the gap _1G1 is obtained by detecting the rotational position of the pulse generating rate magnet 40 attached to the rotor of the DD motor 3 by magnetic detection means such as a Hall element. is the first internal index signal
As IN ₁ , this first internal index signal
It is set at the position where a predetermined count number has been detected since IN ₁ detection. That is, when the count number is detected from the detection of the internal index signal IN, the external index signal EIN is transmitted to the host computer 26 side, and this position becomes the start of the recording track T.

Next, the operation of the disk drive device configured as described above will be explained.

In this type of disk drive device, there is a relatively large temperature difference between when it is not in use and when it is in use. Therefore,
Immediately after turning on the power to the disk drive device, first, the magnetic head 2 scans the surface of the magnetic disk once, and the drive circuit 2 calculates the electrical quantity related to the excitation phase of the stepping motor 11 corresponding to each recording track T.
2 and create a RAM table. A positioning correction method that takes temperature rise into consideration is stored in advance in the microcomputer, and recording/reproduction is normally performed according to the servo algorithm stored in this microcomputer. That is, when recording/reproducing on a desired recording track T by exciting a predetermined excitation phase according to the above RAM table,
When a servo command is issued from the microcomputer to the drive circuit 22 according to the preset servo algorithm, the magnetic head 2 is moved to the servo zone MST closest to the currently located recording track T ₁ (or T ₅ ). , the recording track T ₁
(T ₅ ) is located on the servo track corresponding to the same excitation phase, for example, MST ₁ in FIG.
In this case, if the recording track was at the T ₂ (T ₆ ) position, the servo track would be at the MST ₂ position.
If it is the T ₃ (T ₇ ) position, it will be located at the MST ₃ position, and if it is the T ₄ (T ₈ ) position, it will be located at the MST ₄ position.

Now, when the same excitation phase is excited with the same voltage value, if the gap G of the magnetic head 2 is at the position A in Fig. 4 and the servo signal F is read, then the first servo signal level read and the second servo signal level are There is a difference in the servo signal level read from the servo signal level. Therefore, the signals are discriminated by sample/hold circuits 28 and 29 of the servo circuit 23 as shown in FIG. 6, and the signal levels are compared by a comparison circuit 30. Then, the servo amplifier 31 sets a voltage value to be applied to the excitation phase of the stepping motor 11 according to the comparison value, and the stepping motor 11 is controlled via the drive circuit 22. As a result, the gap G of the magnetic head 2 moves to a symmetrical position with respect to the center line O, as shown in position B in FIG. 4, and converges, thereby defining the fine track position for the servo track _MST1 .

In this case, the RAM table may be updated based on the voltage value set by the servo amplifier, and the fine track position for recording track _T1 may be defined based on this RAM table.

When the movement of the magnetic head 2 converges, the servo signal F of the second servo zone MSZ ₂ is immediately read out for the reason mentioned above, and the servo signal F of the second servo zone MSZ 2 is read out.
MSZ ₂ determines whether the above movement is appropriate.
That is, if the output from the comparator circuit 30 in the second servo zone MSZ ₂ is below a preset level, the above-mentioned moving state is maintained as it is, and if it is above the preset level, the stepping motor 11 is restarted. By driving and performing similar position control, the magnetic head 2 is positioned at a proper track position, that is, a fine track position.

The current value supplied to the excitation phase of the stepping motor 11 when it is located at the fine track position is stored in the RAM of the drive circuit 22, and the magnetic head 2 returns to the original recording track T while checking the RAM table. ₁ position, and the gap G position for the recording track _T1 is defined by the current value stored in the RAM. As a result, a fine track is realized for the recording track _T1 as well.

The RAM table is updated from time to time in response to temperature rises or over time, so that the magnetic head 2 is always controlled based on the latest position data. During recording/reproduction, the head position is not only corrected according to the servo algorithm, but also determined by commands from the controller 25 and host computer 26 in the same manner as described above.

In addition, when the magnetic head 2 traces only one recording track _T1 one by one, the first
A servo command is issued from the drive circuit 22 according to the flow chart shown in the figure. That is, when a preset time has elapsed, it is determined in a first step 51 whether or not the servo calibration time has come. and,
When it is determined that the servo calibration time has come, in a second step 52, it is determined whether the first internal index _IN1 , which is provided at the position corresponding to the gap _4G4 and serves as a reference for writing the servo information F, has been detected. do.

In a second step 52, the first internal index is
If IN ₁ is detected, proceed to the next third step 5.
Move on to 3. In this third step 53, the level of the write gate (Write Gate) is determined. When the write gate is at “L” level, it is in the ON state, that is, the disk drive device is in the writing state.
Light current flows. When it is OFF, it is always in a read state, and if that disk drive is selected, read data is output. Therefore, in this third step 53, when the write gate is not at the "L" level, in other words, when a read is being performed, there is no risk that the controller side will judge it as an error, so the next fourth step Proceed to step 54. In this step 54, the read data is made dummy and the magnetic head 2 is caused to seek to the nearest servo track _MST1 corresponding to the same excitation phase of the servo track group MST, for example. Then, in a fifth step 55, the same servo control as described above is performed on the servo track _MST1 , and the magnetic head 2 is positioned at a fine track position with respect to the servo track _MST1 .

The servo truck is operated by this fifth disk 55.
When the positional calibration of the magnetic head 2 with respect to the MST ₁ is completed, the process moves to the next sixth step 56. The sixth step 56 is a step for obtaining an opportunity to return to the original recording track _T1 and restart reading. When the fifth step 55 is completed, the original recording track T1 is returned to the original recording track T1 based on the position calibration data on the servo track. It seeks to the fine track position of the recording track _T1 and waits for the detection of the first internal index _IN1 . Then, when the first internal index IN ₁ is detected, the read data is returned from dummy data to the data from the normal recording track T ₁ , and then the external index is returned after a predetermined delay time from the detection of the first internal index IN ₁ . Control EIN 2
Output to the 5 side. This is the seventh step 57 in which normal recording/reproducing operations are performed after the magnetic head 2 returns to the recording track _T1 . After passing through this seventh step 57, the gap 4
The head position calibration operation of the magnetic head 2 using _G4 is completed.

As described above, according to this embodiment, for example
Even when using an interface such as the ST-506 interface that does not have a means to notify the disk drive side whether or not the controller is reading read data output from the disk drive device, the drive circuit of the disk drive device, Based on commands from the controller or host computer,
In any case, the head position can be calibrated by servo control by seeking to the servo track.

Note that in the above embodiment, the fourth step 5
In step 4, the read data is dummy and the external index EIN is not output, but instead of not outputting the external index EIN, the seek complete signal is made inactive.
The same operation as above can also be performed.

Furthermore, in the above embodiment, the servo track is provided separately from the recording track, and the positioning of the head device is controlled and the RAM table is updated based on the servo information written in advance on the servo track, but even in the case of the servo sector method. If the head is positioned on the same track for a long time, seek from the final gap position to another track position to obtain the necessary head positioning information and update the RAM table, so that a new seek command can be input. When writing or reading data, it is possible to seek to the target track and write or read with almost no off-track.

Furthermore, one head device reads servo information and performs positioning with respect to the track, and an arm that moves together with the arm to which this head device is attached is provided with a head device for recording/reproducing information; For example, it goes without saying that it can also be applied to what is called a servo surface servo system.

〔Effect of the invention〕

As is clear from the above explanation, in the final gap between the last sector and the first gap, the head positioning information is updated by reading the servo information and seeking to another track for positioning, and then, According to this invention, which makes it possible to restore read data after the final gap, the seek operation is performed at the final gap where no read data has been written, so even if the controller side does not receive read data, it will not be determined as an error. This makes it possible to calibrate the head position based on commands from the disk drive device even when tracing the same recording track.This makes it possible to control the head position without worrying about errors. Since the head positioning information is updated over time, the amount of off-track when seeking to the target track is reduced, making it possible to shorten the overall seek time. This makes it possible to use a disk drive that uses a servo track to calibrate the head position, as well as disk drives that use other servo methods, such as the sector servo method. There are effects such as being able to achieve compatibility with the drive device.

[Brief explanation of drawings]

1 to 6 are for explaining an embodiment of the present invention, and FIG. 1 is a flowchart showing the basic algorithm for head position control, and FIG.
The figure is an explanatory diagram showing a typical example of the track format, Fig. 3 is a block diagram showing the control system, Fig. 4 is an explanatory diagram showing details of the recording track and servo track of the magnetic disk, and Fig. 5 is an explanatory diagram showing the details of the magnetic disk recording track and servo track. An explanatory diagram showing an outline of a recording track and a servo track,
FIG. 6 is a block diagram showing an example of a servo circuit, and FIG. 7 is a partially cutaway perspective view of essential parts showing a specific example of a conventional disk drive device. 1...Magnetic disk, 2...Magnetic head, 3...
...DD motor, 8...Swing arm, 11...
Stepping motor, 21...Head amplifier, 2
2... Drive circuit, 23... Servo circuit, 24...
Interface, 25... Controller, D...
Data zone, F... Servo signal, OST,
MST, IST... Servo track group, MST ₁ ,
MST ₂ , MST ₃ , MST ₄ ...Servo truck,
OSZ ₁ , OSZ ₂ , MSZ ₁ , MSZ ₂ , ISZ ₁ , ISZ ₂ ... Servo zone, T... Recording track, IN ₁ , IN ₂ ...
...Internal index, EIN ...External index, G ₁ ...Gap 1, G ₂ ...Gap 2, G ₃
...Gap 3, G ₄ ...Gap 4, S...Sector.

Claims (1)

[Claims] 1. In a recording medium drive device that writes or reads information to or from a recording track on an information recording medium via a head device, a method for positioning the head device with respect to the recording track includes at least a preset time period. Each time, at the final gap position following the last sector of the track where the head device is located, the head device seeks from that track to another track, reads out the pre-written servo information for each target track, and reads out the servo information that has been read out. Update the positioning information of the head device stored in the storage device based on the information, and then,
The head device is sought to either the track before movement or a target track that has received a separate seek command, the head device is positioned at the fine track position for the sought track, and by either a write or read command, A head positioning control method characterized by performing an operation according to the command from the final gap position.