JPH0660545A - Hard disk device - Google Patents

Abstract

PURPOSE:To shorten time for performing the servo-write of all the recording surface and to reduce the influence of the fluctuation of the rotation of a disk or the drift of a head. CONSTITUTION:A hard disk device is provided with one or more disks and plural heads 9-0 to 9-3 arranged corresponding to the disks, and servo information supplied from one read/write integrated circuit 20 incorporated in the device is recorded on the disk through the heads 9-0 to 9-3. In addition to the circuit 20, the device is provided with write integrated circuits 25 to 27 whose number is less than the total number of the heads 9-0 to 9-3 by one, and the output of the circuits 25 to 27 is connected to the heads 9-1 to 9-3 which are not selected by the circuit 20. Then, the respective circuits 20, and 25 to 27 are driven by a signal from a servo writer, so that the servo information is simultaneously recorded on the disk through the respective heads 9-0 to 9-3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk device, and more particularly, it is possible to servo-write a disk at the same time through a plurality of heads, and to reduce the influence of noise generated by a disk rotation motor. Hard disk device that can

[0002]

2. Description of the Related Art Conventionally, in a hard disk device,
In the case of having one or more disks (magnetic disks) and at least two or more heads arranged corresponding to the disks, for example, in the case where individual heads are arranged on both sides of one disk, respectively. In addition, when the magnetic recording surfaces (hereinafter, simply referred to as recording surfaces) on both sides of the disk are servo-written via the head, that is, when servo information is magnetically recorded, one read / write
According to the operation of the write integrated circuit, first, one head is selected to perform the servo write of the recording surface 0, and after that, the other head is switched to perform the servo write of the recording surface 1. Servo write processing was performed in order of recording surface.

The servo write process in the order of the recording surfaces is the same even when the number of disks in the hard disk device increases and the number of heads increases accordingly, for example, two disks. When a total of four heads are arranged, one on each side, the operation of the one read / write integrated circuit causes the servo write of the recording surface 0 by the head No. 0 first, First
Servo write of recording surface 1 by No. 2 head, then servo write of recording surface 2 by No. 2 head, and finally,
Servo writing on the recording surface 3 is sequentially performed by the third head.

FIG. 5 is a schematic block diagram showing a head driving portion of the conventional hard disk device.

In FIG. 5, reference numeral 50 designates the 0th head and 5
1 is the first head, 52 is the second head, 53 is the third head, 54 is one read / write integrated circuit (R / W IC) built in the hard disk device,
Reference numeral 55 is a servo track writer (STW) outside the hard disk device.

The 0th head 50, the 1st head 51, the 2nd head 52, and the 3rd head 53.
Are connected to a read / write integrated circuit 54, and the read / write integrated circuit 54 is connected to a servo track writer (STW) 55.

The head drive portion of the hard disk device having the above-described structure operates as follows.

When a servo command signal for servo-writing on the recording surface is supplied from the servo track writer (STW) 55 to the read / write integrated circuit 54, the read / write integrated circuit 54 firstly outputs the 0th head. Fifty
Recording surface 0 of a disk (not shown) facing the head 50 through the No. 0 head 50.
Execute the servo write of. When the servo write is completed, the read / write integrated circuit 54 next switches and selects the first head 51, and records on a disk (not shown) facing the head 51 via the first head 51. Perform servo write on surface 1. In the same way,
Servo write is performed on the recording surface 2 of a disk (not shown) facing the head 52 via the second head 52, and finally, the head 5 is moved via the third head 53.
Servo write of the recording surface 3 of the disk (not shown) facing 3 is performed.

In addition to this, a hard disk drive of this type requires a power supply line for supplying drive power from an input / output terminal to a disk rotation motor for rotating a disk. A flexible printed wiring board in which a plurality of power supply lines are configured in the form of flexible printed wiring is used to supply the power.

[0010]

However, in the head drive portion of the conventional hard disk device, when a plurality of heads are used, one read / write integrated circuit is used to select the plurality of heads. Are sequentially performed, and the recording surface of the disk facing the selected head is servo-written, that is, since the servo writing is performed in order of the recording surfaces, all the recording surfaces are servo-written. The problem arises that the time, so-called machine time, becomes long.

If servo recording is separately performed on each recording surface like the head drive portion of a conventional hard disk drive, the disk rotates only while the servo write is being executed, and the disk rotation fluctuation or There is also a problem that the output of the head fluctuates.

Further, in the conventional hard disk device, when the flexible printed wiring board is coupled to the disk rotation motor, the flexible printed wiring board is coupled to the disk rotation motor in the direction of coupling. Since only the direction suitable for the above is selected and the relationship between the coupling direction of the flexible printed wiring board and the movable range of the head is not taken into consideration, the disk rotation motor (signal) The noise generated by the noise is guided to the head via the flexible printed wiring board and is superimposed on the data (signal) at the time of recording, and at the time of reading the recorded data of the disc, the noise is superimposed on the read data and the like. Output, and the noise is the ID disc There is a problem that is particularly greatly affected by the inner circumferential side.

The present invention is intended to eliminate the above-mentioned various problems, and one of the objects thereof is to shorten the time for performing servo writing on all recording surfaces, so-called machine time, and to rotate the disk. An object of the present invention is to provide a hard disk device that is less affected by fluctuations and head wobbling.

Another object of the present invention is to provide a hard disk device that reduces the noise generated from the disk rotating motor from being guided to the head via the flexible printed wiring board.

[0015]

In order to achieve the above-mentioned one object, the present invention has one or more discs and at least two or more heads arranged corresponding to the discs, In a hard disk device for recording servo information supplied from a built-in read / write integrated circuit on the disk via the head,
In addition to the write integrated circuits, a write circuit of a number smaller than the total number of the heads is provided outside the hard disk device, and the outputs of these write circuits are coupled to the heads not selected by the read / write integrated circuit, and the built-in The read / write integrated circuit and each write circuit outside the hard disk drive are driven by a signal from a servo writer, so that a first means for simultaneously recording servo information on the disk via the heads is provided.

In order to achieve the other object, the present invention drives one or more discs, at least one or more heads arranged corresponding to the discs, and rotationally drives the discs. In a hard disk device comprising a disk rotating motor and a flexible printed wiring board that electrically connects the disk rotating motor and input / output terminals, when the flexible printed wiring board is led out from the disk rotating motor Secondly, the second means is provided so that the leading direction thereof is out of the movable range of the head.

[0017]

According to the first means, the built-in lead /
In addition to the write integrated circuit, a number of write circuits less than the total number of heads are provided, and the built-in read / write integrated circuit and each write circuit outside the hard disk device are driven by a signal from a servo writer. There is. Therefore, the servo information is simultaneously supplied to the heads coupled to the respective write circuits via the corresponding write circuits, whereby the servo writing on a plurality of recording surfaces can be simultaneously performed. The time to perform servo write on all recording surfaces, so-called machine time, can be made considerably shorter than the conventional one, and due to the drastic reduction in the number of rotations of the disk rotation motor required for servo write, disk rotation fluctuation and head fluctuation The influence of can be extremely reduced.

According to the second means, when the flexible printed wiring board is led out from the hard disk device, the lead-out direction is far outside the movable range of the head, preferably from the movable range of the head. Since the angular directions are separated by about 60 degrees in the positive and negative directions, the ratio of the noise generated by the disk rotation motor to the head through the flexible printed wiring board is extremely small. At the time of servo writing or reading of recorded data on the disc, the rate of superimposition of the noise on the read data is extremely small.

[0019]

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

1A and 1B are structural views showing the entire structure of a hard disk device according to the present invention with a lid, in which FIG. 1A is a top view thereof, and FIG. 1B is a side view of its long side. 6C is a side view of the short side, and FIG. 8D is a configuration diagram of the disk rotation motor.

In FIG. 1, 1 is a main body of a hard disk device, 2 is a lid, 2'is a label, 4 is a disk rotating motor (spindle motor), 5 is a rotating shaft of the disk rotating motor 4, and 6 is a flexible printed wiring. Board (F
PC) and 7 are holes for simultaneous servo writing provided in the lid 2.

The entire top surface of the hard disk drive body 1 is hermetically closed by a lid 2 with an O-ring interposed, and a servo write hole 7 into which a servo write pin is inserted is opened in the lid 2. There is. A shaft center portion of the disk is attached to a rotation shaft 5 of the disk rotation motor 4, and a flexible printed wiring board 6 is led out from a lower portion of the disk rotation motor 4.

FIG. 2 is a top view showing the entire structure of the hard disk device with the lid removed.

In FIG. 2, 3 is a disk, 8 is a head transfer mechanism, 9 is a head (magnetic head), 10 is a support spring, 11 is a swing arm, 12 is a support shaft, 13 is a coil, 14 is a lead wire, 15 Is a voice coil motor, 1
6 is a stopper pin, 17 is a solenoid, 18 is an operating lever, 19 is a printed circuit board, 20 is a read / write integrated circuit, 21 is an input / output terminal, 22 is a simultaneous servo write connection pin, and 23 is an operating lever rotating shaft. In addition, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

The head transfer mechanism 8 has a swing arm 11 rotatably attached to a support shaft 12 and a support spring 1 attached to one end of the swing arm 11.
0, a head 9 attached to the inside of the tip of the support spring 10, and a coil 13 attached to the other end of the swing arm 11, and a lead wire 14 for signal transmission is connected to the head 9. There is. Voice coil motor 15
Uses the coil 13 as one of the constituent elements, and works to move the head transfer mechanism 8 by a predetermined angle in response to a command signal. Inside the voice coil motor 15, a stopper pin 16 for preventing the head transfer mechanism 8 from moving beyond a required angle is abutted, and the stopper pin 16 of the coil 13 is moved when the head transfer mechanism 8 is excessively moved. It is configured to abut the inner portion. The solenoid 17 controls, together with the operating lever 18, the movement of the head transfer mechanism 8 and releases the restriction. The operating lever 18 has protrusions at both ends and rotates on the operating lever rotating shaft 23. Freely supported. One protrusion of the operating lever 18 is engaged with an engaging pin provided on the swing arm 11 of the head transfer mechanism 8, and the other protrusion is in contact with the actuator of the solenoid 17, and the operating lever 18 is always It is biased (biased) clockwise by a spring spring (not shown).

The printed circuit board 19 is attached to the chassis of the hard disk drive main body 1, and the read / write integrated circuit 20,
An input / output terminal 21, which is connected to a control circuit board (not shown) provided on the back surface of the chassis, a connection pin 22 for simultaneous servo writing, and other necessary parts are arranged, and necessary wiring is made. It is what

In this case, in the example of FIG. 2, only one disk 3 is shown, and accordingly, there is also one head transfer mechanism 8 (the number of heads 9 is one above and below the disk 3, respectively).
However, when the number of disks 3 to be stacked is two or more, the number of head transport mechanisms 8 to be stacked also increases in accordance with the number, for example, When two disks 3 are used, the number of head transfer mechanisms 8 is also two, and the number of heads used is four.

In the hard disk device having the above-mentioned structure, the following operations are generally performed.

First, when the hard disk device is not operating, the solenoid 17 is de-energized and the operating lever 1
8 is rotated clockwise by the elastic bias of the mainspring, whereby the one protrusion of the operating lever 18 is engaged with the engaging pin of the swing arm 11, and the head transfer mechanism 8 is rotated in the maximum counterclockwise direction. Has been moved to, that is,
The head 9 is placed at the innermost position of the disk 3, and the head transfer mechanism 8 is locked.

Next, when a hard disk device enters an operating state by a command from a host computer (not shown), the solenoid 17 is energized and its actuator is retracted. In this state, the operating lever 18
Is rotated counterclockwise against the elastic bias of the mainspring, and the one projection is disengaged from the engagement pin, so that the head transfer mechanism 8 can freely rotate, that is,
The head transfer mechanism 8 is unlocked.

Here, when the control circuit executes the 0 track restore, the head transfer mechanism 8 moves to the 0 track, reads necessary information, and then receives the next command from the host computer or the control circuit. Waiting at this position.

Subsequently, when a data write or read command is output from the host computer, the control circuit executes a seek operation, and a control current is supplied to the coil 13 of the head transfer mechanism 8, whereby the head transfer is performed. Mechanism 8 seeks to the target track. After performing this seek, the head transfer mechanism 8 writes a signal to the disk 3 or reads a signal from the disk 3.

Further, in the subsequent operation, any one of the above-mentioned operations is repeatedly executed based on a command such as write or read from the host computer.

As described above, the signal write and read are
Generally, the hard disk drive has one read / write integrated circuit 20 built therein because it is performed for a specific track of the disk.

By the way, in the hard disk device shown in FIGS. 1 and 2, when performing simultaneous servo writing on a plurality of media, the read / write integrated circuit 20 built in the hard disk device is set to 1 as described above.
Since there is only one, as described in the conventional hard disk device, the simultaneous servo write cannot be performed as it is.

Therefore, in the present invention, in addition to the one read / write integrated circuit 20, a number of write integrated circuits which is one less than the total number of heads 9 used is provided, and these write integrated circuits are provided. The simultaneous servo write circuit board is provided so that the output of the above can be coupled to the head not selected by the one read / write integrated circuit 20.

Here, FIG. 3 is a circuit diagram showing an embodiment of the simultaneous servo write circuit board. In this example, the number of disks 3 is two and the number of heads is four. It shows a certain case.

In FIG. 3, 9-0 is the 0th head,
9-1 is the first head, 9-2 is the second head, 9
-3 is a third head, 24 is a simultaneous servo write circuit board, 25 is a first write integrated circuit, 26 is a second write integrated circuit, 27 is a third write integrated circuit, and 28 is a simultaneous servo write circuit. Input / output terminals on the servo and rack writer (not shown) side of the board 24; 29, input / output terminals on the hard disk device side of the simultaneous servo write circuit board 24;
Reference numerals 31, 32, 33, 34, and 35 are external capacitors.

The simultaneous servo light circuit board 24
Has a first light integrated circuit 25, a second light integrated circuit 26, a third light integrated circuit 27, and a plurality of external capacitors 30 to 35. The inside is connected and connected as shown in the drawing. There is. Also, the simultaneous servo light circuit board 2
The input / output terminal 28 of No. 4 has a ground potential terminal (GND), a power supply voltage terminal (Vcc), and a level 1 (Hi
gh), a read / write (R / W) command signal supply terminal that becomes level 0 (Low) at the time of writing (W) and an external resistor set the currents flowing through the heads 9-1 to 9-3 to appropriate values. Write current terminal (WC ₁ , W
C _2, WC _3), lead (in R) times the level 1, the write (W) write data in (WDI) signal supply terminal during repeated Level 1 and Level 0 alternately, first to third
Of the write integrated circuits 25 to 27, the write unsafe (WUS ₁ , WUS ₂ , WUS ₃ ) signal output terminals are set to level 1 when the write integrated circuits 25 to 27 are defective, and level 0 otherwise. On the other hand, the input / output terminal 29 of the simultaneous servo write circuit board 24 has a center tap signal (Vc) which becomes level 1 at the time of writing (W) and level 0 at the time of reading (R).
t), which is connected to both ends of the first to third heads 9-1 to 9-3, and outputs the write data in (WD
I) It is turned on and off alternately according to the signal levels 1 and 0,
From the center tap signal output terminal to the heads 9-1 to 9-
Terminals (H _1X , which alternately take in the current supplied to 3
_H1Y , _H2X , _H2Y , _H3X , _H3Y ).

Although not shown, the read / write integrated circuit 20 has input / output terminals similar to the input / output terminals 28 and 29 of the simultaneous servo write circuit board 24. Is a read / write integrated circuit 2
Functions related to No. 0 head 9-0 in cooperation with 0,
That is, the same functions as those related to the first to third heads 9-1 to 9-3, which are performed in cooperation with the simultaneous servo write circuit board 24 and the input / output terminals 28 and 29 thereof. Is configured to be achieved.

Here, the simultaneous servo write circuit board 24 according to the present embodiment operates as described below.

Now, from the servo track writer (not shown), the input / output terminal 2 of the simultaneous servo write circuit board 24
8, the write command signal of the R / W command signal is supplied, and at the same time, when the write data-in signal that repeats level 1 and level 0 is supplied, the first to third write integrated circuits 25 to 27 are supplied. Responds to the write command signal and the write data-in signal, and outputs the center tap signal (current) from the input / output terminal 29 of the simultaneous servo write circuit board 24 that lasts for the period corresponding to the supply period of the write command signal. At the same time, the terminals H _1X , H _1Y ,
H _2X , H _2Y , H _3X and H _3Y are alternately turned on and off.

In the head drive portion of the hard disk device, the center tap signal (current) including the read / write integrated circuit 20 is supplied to each of the 0th to 3rd heads 9-0 to 9-3. It is supplied to the center tap at the same time, and both ends of the 0th head 9-0 are alternately turned on / off according to a write data-in signal.
The signals (currents) connected to the terminals H _0X and H _0Y of the light integrated circuit 20 and supplied to the center tap of the head 9-0 are alternately _fetched to the terminals H _0X and H _0Y .
At the same time, it is connected to both ends of the first to third heads 9-1 to 9-3 and alternately turned on / off in response to a write data-in signal from the input / output terminal 28 of the simultaneous servo write circuit board 24. Terminals H _1X , H _1Y , H _2X , H _2Y ,
Center tap signals (currents) supplied to the heads 9-1 to 9-3 alternately flow into H _3X and H _3Y .

As described above, in this embodiment, when the servo command signal is supplied from the servo track writer, one read / write integrated circuit 20 built in the hard disk device and one provided outside the hard disk device are provided. By the operation of the first to third write integrated circuits 25 to 27 arranged on the simultaneous servo write circuit board 24, all heads, that is, the 0th to 3rd heads 9-0 to 9-. 3 is switched and selected at the same time. In each of the above 9-0 to 9-3, the servo write on the recording surface 0 of the first disk 3 facing the head 9-0 via the 0th head 9-0 is the first. The servo write on the recording surface 1 of the first disk 3 facing the head 9-1 via the second head 9-1 causes the head 9 to move through the second head 9-2.
-2, the servo write on the recording surface 2 of the second disk 3 is transmitted to the head 9 through the third head 9-3.
Similarly, the servo write on the recording surface 3 of the second disk 3 opposite to -3 is simultaneously executed.

Therefore, according to the present embodiment, by providing the simultaneous servo write circuit board 24 outside the hard disk device, all the heads 9-0 to 9-3 are switched and selected at the same time when the servo command signal is supplied. Since the servo writing on all recording surfaces 0 to 3 is performed at the same time, the time for performing the servo writing, that is, the so-called machine time can be shortened.

Further, according to the present embodiment, when the servo write is performed, the time for rotating the disk 3 is minimized, so that the rotation fluctuation of the disk 3 and each head 9-0.
It becomes possible to reduce the influence of the fluctuation of 9 to 9-3.

In this case, all the heads 9-0 to 9
For simultaneous selection of -3 and simultaneous servo writing of all recording surfaces 0 to 3, a predetermined connecting jig (not shown) is attached to the simultaneous servo writing connecting pin 22 on the printed circuit board 19 shown in FIG. It is executed by fitting it through the simultaneous servo write hole 7 of the lid body 2, and by the fitting of the connecting jig, the input / output terminal 29 of the simultaneous servo write circuit board 24 and the head input of the drive portion of the hard disk device. That is, the portion, that is, the simultaneous servo write connection pin 22 (the portion indicated by the dotted line in FIG. 3) is electrically connected. With the configuration of this embodiment, the number of the simultaneous servo write connection pins 22 is only seven, and even in the general case, when the number of the heads 9 is n, the simultaneous servo write is performed. The number of write connection pins 22 is (n-1)
X2 + 1 is sufficient.

Since the servo information is clear, that is, the servo writing is performed at the time of manufacturing the hard disk device, the simultaneous servo writing hole 7 is hidden in the hard disk device where the servo writing is completed, and the hard disk device In order to seal the inside of the device, a label 2'is attached to the lid body 2 as shown in FIG.

Further, FIG. 4 is a partially transparent configuration diagram showing the configuration of a disk rotating motor portion in the hard disk device according to the present invention.

In FIG. 4, reference numeral 36 denotes a flexible printed wiring board according to a conventional arrangement, and other components that are the same as those shown in FIG. 2 are designated by the same reference numerals.

In the conventional hard disk device, since the flexible printed wiring board 36 is mainly derived from the disk rotating motor 4 as shown by the dotted line in FIG. This noise is mainly noise of about 600 to 1800 c / sec generated when the phase of the motor 4 is switched and external noise superimposed on the power source.)
Was superimposed on the read signal when the disk 3 was read, and also affected the write signal when the disk 3 was written.

On the other hand, in this embodiment, as shown in FIG.
As shown by the solid line, the direction in which the flexible printed wiring board 6 is led out from the disk rotation motor 4 is specifically described in a direction far away from the movable range of the head transfer mechanism 8, in particular, the movable range of the head 9. Then, the head transfer mechanism 8 is selected so as to be located at a position about 60 degrees away from the movable range of the head transfer mechanism 8 in the negative direction (counterclockwise direction).

In this way, when the direction of the flexible printed wiring board 6 is selected, the disk rotation motor 4 is selected.
The ratio of the above-mentioned noise generated at 1) to be superposed on the read signal or the write signal at the time of reading or writing of the disk 3 is considerably small, and the reduction result of the noise superposed on the signal at this point is also experimentally confirmed. I was able to confirm.

In this embodiment, the head transfer mechanism 8 is used as the lead-out direction of the flexible printed wiring board 6.
However, the flexible printed wiring board 6 according to the present invention is not limited to the above-mentioned position in which the flexible printed wiring board 6 is led out. For example, the head transfer mechanism 8 may be selected so as to be located at a position approximately 60 degrees away from the movable range in the positive direction (clockwise direction), or at a position more than approximately 60 degrees away from the movable range in both positive and negative directions. May be selected, or the position may be separated from the movable range by an angle slightly smaller than 60 degrees in both positive and negative directions.

As described above, according to this embodiment, the direction in which the flexible printed wiring board 6 is led out is set to the head transfer mechanism 8.
Since it is selected to be far away from the movable range of the disk, the noise generated from the disk rotation motor 4 is minimized from being guided to the head 9 via the flexible printed wiring board 6, The noise superimposed on the read signal and the write signal at the time of reading or writing 3 can be extremely reduced.

[0056]

As described above, according to the present invention,
Write circuits 25 to 27 of a number smaller than the total number of heads 9
By arranging the simultaneous servo write circuit board 24 in which is arranged outside the hard disk device, all the heads 9 are simultaneously switched and selected when the servo command signal is supplied,
Since the servo writing on all recording surfaces is performed at the same time, there is an effect that the time for performing the servo writing, that is, the so-called machine time can be significantly reduced.

Further, according to the present invention, if the servo write is performed at the same time, the rotational driving time of the disk 3 is shortened, so that there is an effect that the influence of the rotational fluctuation of the disk 3 and the fluctuation of each head 9 can be reduced. .

Further, according to the present invention, the lead-out direction of the flexible printed wiring board 6 led out from the disk rotation motor 4 is selected to be a direction far away from the movable range of the head transfer mechanism 8. Therefore, it is possible to reduce the noise generated from the motor 4 from being guided to the head 9 via the flexible printed wiring board 6, and thereby, when the head 9 reads or writes the disk 3, a read signal is read. Alternatively, there is an effect that the noise superimposed on the write signal can be extremely reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall structure of a hard disk device according to the present invention with a lid.

FIG. 2 is a top view showing the overall structure of the hard disk device with the lid removed.

FIG. 3 is a circuit configuration diagram showing an embodiment of a simultaneous servo write circuit board.

FIG. 4 is a partially transparent configuration diagram showing a configuration of a disk rotation motor portion in the hard disk device according to the present invention.

FIG. 5 is a schematic configuration diagram showing a head driving portion of a conventional hard disk device.

[Explanation of symbols]

1 Hard Disk Device Main Body 2 Lid 3 Disc 4 Disk Rotating Motor (Spindle Motor) 5 Rotating Shaft of Disk Rotating Motor 4 Flexible Printed Wiring Board (FPC) 7 Servo Light Hole on Lid 2 8 Head Transfer Mechanism 9 head (magnetic head) 9-0 No. 0 head 9-1 No. 1 head 9-2 No. 2 head 9-3 No. 3 head 10 Support spring 11 Swing arm 12 Spindle 13 Coil 14 lead wire 15 voice coil motor 16 stopper pin 17 solenoid 18 operating lever 19 printed circuit board 20 read / write integrated circuit 21 input / output terminal 22 simultaneous servo write connection pin 23 operating lever turning shaft 24 simultaneous servo write circuit board 25 1st Light integrated circuit 26 second light integrated circuit 27 Third write integrated circuit 28 Input / output terminal of simultaneous servo write circuit board 24 29 Input / output terminal of simultaneous servo write circuit board 24, 31, 31, 32, 33, 34, 35 are external capacitors

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Nakano 1-7 Yukiya Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd.

Claims (2)

[Claims] 1. A servo system comprising one or more discs and at least two or more heads arranged corresponding to the discs, wherein servo information supplied from a built-in read / write integrated circuit is stored in the heads. In the hard disk device for recording data on the disk via the read / write integrated circuit, write circuits less in number than the total number of the heads are provided outside the hard disk device, and outputs of these write circuits are integrated in the read / write integrated circuit. By connecting to a head not selected by a circuit and driving the built-in read / write integrated circuit and each write circuit outside the hard disk drive by a signal from a servo writer, servo information is written to the disk. A hard disk device characterized by simultaneously recording via a. 2. One or more discs, at least one or more heads arranged corresponding to the discs, a disc rotation motor for rotationally driving the discs, the disc rotation motor and an input / output terminal. In a hard disk device comprising a flexible printed wiring board for electrically connecting the flexible printed wiring board and a flexible printed wiring board, when the flexible printed wiring board is led out from the disk rotation motor, the leading direction is out of the movable range of the head. A hard disk device characterized by the fact that