JPH1145530A - Hard disk device and information processor having hard disk device built in - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard disk device having a protection control means for avoiding a vital damage when an impact is applied to the device, and information processor which contains this hard disk device. SOLUTION: This device rotates a magnetic disk 3 and moves a slider constituted with a magnetic head in the radial direction of this magnetic disk 3 to perform recording/reproducing. In such a case, the device includes an acceleration detecting means (acceleration sensors 7z, 7x, 7y) for detecting the external force exerted on the hard disk device and has the protection control means which saves the slider from the recording/reproducing region of the magnetic disk 3 when the absolute value α(m/s<2> ) of the square root calculated by (αz <2> +αx <2> +αy <2> ) of the accelerations (αz , αx , αy ) detected by the acceleration detecting means is α<G and (-α)×t>=1.4(m/s) where the time when the acceleration is below the gravity acceleration G(m/s2 ) is defined as t (s).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive and an information processing apparatus having a built-in hard disk drive. More particularly, the present invention relates to a slider having a magnetic head when an external force is applied. The present invention relates to a hard disk device having a protection control unit to be evacuated and an information processing device incorporating the hard disk device.

[0002]

2. Description of the Related Art As an auxiliary storage device used in an information processing apparatus, a floppy disk device using a magnetic disk, a hard disk device, and the like are generally known.
2. Description of the Related Art Hard disk devices can be written and read at a high transfer rate, and have been built in a wide range of information processing devices in recent years. The following is an example of a hard disk device, which is a so-called CSS (Contact Start S).
A schematic configuration of a hard disk device referred to as a (top) method will be described with reference to FIGS.

FIG. 4 is a schematic plan view of a hard disk drive of the CSS method, FIG. 5 is a schematic enlarged view of a portion A in FIG. 4, and FIG. 6 is a schematic view as viewed in the direction of arrow B in FIG. As shown in FIG. 4, the CSS type hard disk drive includes a magnetic disk 3 mounted on a spindle motor 2 mounted on a housing 1 of the hard disk drive.
And a rotary actuator 4.
For the case shown in FIG. 4, the direction of rotation of the spindle motor 2 becomes arrow direction indicated by R ₁ in FIG. On the magnetic disk 3 side of the rotary actuator 4, an arm 4a for defining the length of the rotary actuator 4 on the magnetic disk 3 is provided. A suspension 4b which is an elastic member pressed against the magnetic disk 3, and a magnetic head for recording a signal on the magnetic disk 3 or reproducing the recorded signal on the suspension 4b, as shown in FIGS. Is mounted. A coil 4d is mounted on the opposite side, and a magnet 4e fixed to the housing 1 is provided.
, Ie, the direction and magnitude of the current flowing through the coil 4d, the rotary actuator 4 is configured to rotate about the rotation center 4f.

When the hard disk drive of the CSS system is started, the floating head slider 4c is arranged at a position called a CSS zone 3a formed on the inner circumference of the magnetic disk 3, as shown in FIG. This CSS zone 3a
The rotation of the spindle motor 2 is started in a state where the floating head slider 4c is brought into contact with the slider. Therefore, at the time of startup, the floating head slider 4c flies while rubbing the surface of the magnetic disk 3. While the magnetic disk 3 is rotating, the aerodynamic force acting between the floating head slider 4c and the magnetic disk 3 (the direction in which the floating head slider 4c is moved away from the surface of the magnetic disk 3) and the suspension 4b The floating head slider 4c is controlled so that the distance from the surface of the magnetic disk 3 becomes several tens of nm by the balance with the elastic force (the direction in which the floating head slider 4c is pressed against the surface of the magnetic disk 3). In this state, by controlling the direction and magnitude of the current flowing through the coil 4d, the rotary actuator 4 is controlled and driven,
The floating head slider 4c can access any position in the radial direction of the magnetic disk 3. At the time of stop, the floating head slider 4c stops while rubbing the surface of the magnetic disk 3 in the CSS zone 3a.

Next, the CSS zone 3a is
FIG. 7 shows a schematic configuration of a so-called ramp loading type hard disk drive that mechanically lifts a floating head slider 4c at the tip of the rotary actuator 4 from the surface of the magnetic disk 3 without providing the disk drive.
This will be described with reference to FIGS.

FIG. 7 is a schematic plan view of a ramp loading type hard disk drive, FIG. 8 is an enlarged view of a schematic C portion in FIG. 7, and FIG. 9 is a schematic D view as viewed in a direction D in FIG. . As shown in FIG. 7, the floating head slider 4 attached to the rotary actuator 4
A lamp 5 having a tapered portion 5a having a tapered portion 5a formed in a direction gradually moving away from the surface of the magnetic disk 3 from the outer peripheral portion to the outer peripheral portion of the magnetic disk 3 along the trajectory of the rotation of the c. It is stuck to. As shown in FIGS. 8 and 9, a load plate 6 is attached to the end of the suspension 4b, and a semicircular portion is provided on the side of the load plate 6 which comes into contact with the tapered portion 5a formed on the ramp 5. A spherical dimple 6a is formed.

When the ramp loading type hard disk drive is stopped, the rotary actuator 4 is moved to the position shown in FIG.
Driven in an arrow direction shown in the R _2. At this time, the dimple 6a formed on the load plate 6 rides on the tapered portion 5a of the ramp 5, the suspension 4b is lifted accordingly, and the floating head slider 4c is separated from the surface of the magnetic disk 3. (The state shown in FIG. 7) is saved (the above operation is called unloading). Thereafter, the spindle motor 2 is stopped.

[0008] startup spindle motor 2 in the hard disk drive ramp loading method, after the spindle motor 2 rises to a predetermined angular speed, driving in the direction of the arrow showing the rotation actuator 4 by R ₃ in FIG. In this state, the dimple 6a formed on the load plate 6 is completely released from the tapered portion 5a of the ramp 5 and becomes free, and the floating head slider 4c is pressed against the surface of the magnetic disk 3 by the elastic force of the suspension 4b. By the aerodynamic lift acting on the slider 4c, the slider 4c flies while being controlled so that the distance from the surface of the magnetic disk 3 becomes several tens of nm (the above operation is called load). In this state, the access of the floating head slider 4c in the radial direction of the magnetic disk 3 is optional. In the ramp-loading type hard disk drive of the above-described case, the floating head slider 4c is kept in a non-contact state with the surface of the magnetic disk 3 when stopped, and has excellent impact resistance. It is being widely adopted in devices.

[0009] However, when an impulse-like impact is applied to the hard disk drive due to sudden vibration, drop, or the like,
It is known that the suspension 4 b constituting the rotary actuator 4 jumps up, and the floating head slider 4 c is strongly hit against the surface of the magnetic disk 3. In particular, when the hard disk drive is driven and the magnetic disk 3 is rotated at a high speed by the spindle motor 2 and such vibration or impact is applied, data recorded on the surface of the magnetic disk 3 is destroyed. There is a possibility that it will be done. Incidentally, the hard disk device may suffer fatal damage if it is simply dropped on a hard floor from a height of about 10 cm. At this time, the time until collision with the floor surface is approximately 0.14 (s), and the speed at the time of collision with the floor surface is 1.4 (m / s).

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to record a magnetic head on a magnetic disk by using a slider such as a floating head slider even when an impulse-like shock is applied due to sudden vibration or drop. The present invention provides a hard disk device having protection control means for evacuating from a reproduction area and avoiding catastrophic damage, and an information processing apparatus incorporating the hard disk device.

[0011]

In order to solve the above problems, in a hard disk drive of the present invention, a magnetic disk as a magnetic recording medium is rotated and a slider having a magnetic head is moved in a radial direction of the magnetic disk. In a hard disk device that performs recording / reproduction by moving the hard disk device, the hard disk device includes acceleration detecting means for detecting an external force applied to the hard disk device, and the absolute value α (m / s ² ) of the acceleration detected by the acceleration detecting means is determined by gravity. The acceleration G ((m /
When α <G and (G−α) × t ≧ 1.4 (m / s), where t (s) is a time that is equal to or less than s ² ), a slider such as a floating head slider is used for the magnetic disk. A hard disk drive of the CSS system is provided with protection control means for evacuating from the recording / reproducing area to a CSS zone, for example, and a hard disk drive of a ramp loading type is provided with a slider mounted on a tapered portion of a ramp. .

In an information processing apparatus incorporating a hard disk drive according to the present invention, recording / reproduction is performed by rotating a magnetic disk as a magnetic recording medium and moving a slider having a magnetic head in a radial direction of the magnetic disk. In an information processing device incorporating a hard disk device,
The information processing apparatus is provided with acceleration detecting means for detecting an external force applied thereto, and the absolute value α (m / s ² ) of the acceleration detected by the acceleration detecting means is equal to or less than the gravitational acceleration G (m / s ² ). When the time is t (s) and α <G and (G−α) × t ≧ 1.4 (m / s), the slider such as the floating head slider is retracted from the recording / reproducing area of the magnetic disk. It is characterized by having protection control means for causing the protection.

The acceleration detecting means in the hard disk device and the information processing device incorporating the hard disk device may detect at least an external force from a direction perpendicular to the main surface of the magnetic disk. First acceleration detection means for detecting an external force from a direction perpendicular to the surface, second acceleration detection means for detecting an external force from a direction perpendicular to the direction perpendicular to the main surface of the magnetic disk and orthogonal to each other, and a third acceleration detection means. And acceleration detecting means. The value of alpha above in this case, the acceleration detected by the first acceleration detecting means and alpha _z, the acceleration detected by the second acceleration detector as alpha _x, detected by the third acceleration detector Α _y (α _z ² + Α _x ² + α _y ² ) is the absolute value of the value calculated by the square root.

The operation of the above means will be described below. The absolute value α (m / s ² ) of the acceleration detected by the acceleration detecting means provided in the hard disk device or the information processing device incorporating the hard disk device, and the absolute value α (m) of the acceleration detected by the acceleration detecting device / S
² ) is equal to or less than the gravitational acceleration G ((m / s ² ))
(S), and the value of (G-α) × t is such that the hard disk drive falls from a height of about 10 cm to a hard floor surface by itself and may be fatally damaged. 4 (m / s) is set as a threshold, and a protection control means for retracting the slider from the recording / reproducing area of the magnetic disk when the threshold becomes equal to or more than 4 (m / s) is provided, so that the data is recorded at least on the surface of the magnetic disk. Catastrophic damage that destroys data can be avoided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hard disk drive according to the present invention and an information processing apparatus having a built-in hard disk drive are provided with acceleration detecting means such as an acceleration sensor. It is characterized by having a protection control means for retracting a slider having a head from a recording / reproducing area of a magnetic disk. FIG. 1 shows a preferred embodiment of the present invention.
3 to FIG. 3, the schematic configuration of the hard disk device is the same as the case described with reference to FIG. 4 to FIG. 9 in the related art, and a duplicate description will be omitted. Note that components in the figure that have the same structure as the conventional technology are denoted by the same reference numerals. Further, the present invention is not limited to the following two embodiments.

Embodiment 1 In this embodiment, an external force from a direction perpendicular to the main surface of a magnetic disk 3 of a hard disk drive is detected, and an acceleration sensor 7z as first acceleration detecting means and a magnetic disk 3 are detected. In this case, an external force is detected in a direction perpendicular to the main surface and orthogonal to each other, and an acceleration sensor 7x serving as second acceleration detecting means and an acceleration sensor 7y serving as third acceleration detecting means are provided. is there. 1 and 2 which are schematic perspective views of a hard disk drive.
This will be described with reference to FIG.

The hard disk drive is provided with acceleration sensors 7z, 7x, 7y orthogonal to each other.
The absolute value α of the square root calculated by (α _z ² + α _x ² + α _y ² ) of accelerations α _z , α _x , and α _y detected by x and 7y
(M / s ² ) is monitored. When the hard disk device is stationary, the absolute value α (m / m
s ²⁾ shows the earth's gravitational acceleration G (m / s ^2), in a state in which the vibration or shock or the like in the mobile time is applied is mostly (α> G), duration of the (alpha <G) do not do. When the hard disk device is naturally falling, or falls while rotating around one point, if it falls freely for a certain period of time (α ≒ 0), it falls while rotating around one point. Is (0 <α <G). That is, the absolute value α (m / s ² )
And monitoring the duration t (s) of the hard disk drive, it is possible to know the state of the hard disk drive, and to determine whether or not the floating head slider 4c should be urgently evacuated by controlling the rotary actuator 4. Can be. The arrows in the figure indicate the detected acceleration detection direction.

In practice, (G-α) × t is calculated, and
When this value exceeds the threshold, the rotary actuator 4 is controlled and driven to retract the floating head slider 4c. The threshold value is 1.4 (m / s), which is the collision speed when the hard disk device is naturally dropped on the floor from a height of about 10 cm.
It is desirable that That is, as a protection control means when (α <G) and (G−α) × t ≧ 1.4 m / s are detected by the controller provided in the hard disk drive, the controller is turned off by the controller in the CSS type hard disk drive. A signal for retracting the floating head slider 4c to the CSS zone 3a is supplied to the dynamic actuator 4 and a rapid braking signal is supplied to the spindle motor 2 to rapidly decelerate or stop the magnetic disk 3. FIG.
In the hard disk drive of the ramp loading type shown in (1), it is only necessary to supply a signal for retracting the floating head slider 4c to the ramp 5 from the controller to the rotary actuator 4, and it is not necessary to rapidly decelerate or stop the magnetic disk 3 rapidly. . If the threshold is set at 1.4 (m / s), the hard disk drive can be protected from catastrophic damage, and there is no possibility that at least data recorded on the surface of the magnetic disk 3 will be destroyed.

Embodiment 2 This embodiment is directed to an acceleration sensor 7z as first acceleration detecting means only in a direction perpendicular to the main surface of the magnetic disk 3.
It is a case provided with. This will be described with reference to FIG. 3 which is a schematic perspective view of the hard disk device. The hard disk drive is provided with an acceleration sensor 7z only in a direction perpendicular to the main surface of the magnetic disk 3, and an absolute value α _z (m / s) of the acceleration detected by the acceleration sensor 7z by a controller (not shown). ² ) is being monitored. When the hard disk device is stationary, the absolute value α _z (m / s ² ) is the gravitational acceleration value G of the earth.
( _M / s ² ), and generally (α _z >) when a shock or the like in the vertical direction is applied to the main surface of the magnetic disk 3.
G), and the time when (α _z <G) does not last. In addition, in a state where the hard disk device is naturally falling, if the falling direction and the detection direction of the acceleration sensor 7z match for a certain period of time or more, (α ≒ 0), but in other cases, (α _z) <G). That is, the absolute value α _z
By monitoring (m / s ² ) and the duration t (s), the state of the hard disk drive can be known, and whether or not the floating head slider 4 c is urgently evacuated by controlling the rotary actuator 4 is determined. Can be determined.

In practice, (G-α _z ) × t is calculated, and when this value exceeds the threshold, the rotary actuator 4 is controlled and driven to retract the floating head slider 4c. The threshold value is 1.4 (m / m), which is the collision speed when the hard disk device is naturally dropped on the floor from a height of about 10 cm.
s). That is, a CSS hard disk is used as protection control means when (α− _z ) × t ≧ 1.4 (m / s) is detected by a controller built in the hard disk drive while (α _z <G). In the apparatus, a signal for retracting the floating head slider 4c to the CSS zone 3a is supplied from the controller to the rotary actuator 4 and a rapid braking signal is supplied to the spindle motor 2 to rapidly decelerate or stop the magnetic disk 3. In a ramp loading type hard disk drive (not shown), the controller only needs to supply a signal to the rotary actuator to retract the floating head slider to the ramp, and it is not necessary to rapidly decelerate or stop the magnetic disk. If the threshold is set at 1.4 (m / s), the hard disk drive can be protected from catastrophic damage, and there is no possibility that at least data recorded on the surface of the magnetic disk 3 will be destroyed.

In the first and second embodiments described above, another means for controlling and driving the floating actuator 4 to retract the floating head slider 4c is as follows.
Since the free fall time when the hard disk device falls naturally from a height of 10 cm is approximately 0.14 seconds,
Only the time when (α <G) in Example 1 or (α _z <G) in Example 2 is monitored,
It may be performed by detecting that the time has exceeded 4 seconds. Also,
In the above-described CSS type hard disk drive, an example in which the floating head slider 4c is retracted in the CSS zone 3a has been described in the first and second embodiments.
An evacuation position dedicated to evacuation may be prepared separately from the zone 3a.

According to the present invention, the information processing apparatus itself incorporating the hard disk device may be provided with the same acceleration sensor as the case shown in the first embodiment or the second embodiment. Does not require an acceleration sensor in the hard disk device. And in the information processing device,
When a gravitational acceleration that acts at a collision speed of 1.4 (m / s) is applied, an emergency evacuation command is supplied from the information processing device to the hard disk device. The following is the same as the case of the first embodiment described with reference to FIGS. 1 and 2 or the second embodiment described with reference to FIG. 3, and thus redundant description will be omitted.

[0023]

According to the hard disk drive and the information processing apparatus incorporating the hard disk drive of the present invention, the hard disk drive can be protected from catastrophic damage, and at least data recorded on the surface of the magnetic disk may be destroyed. Disappears.

[Brief description of the drawings]

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

FIG. 2 is a schematic perspective view of a hard disk drive according to Embodiment 1 of the present invention.

FIG. 3 is a schematic perspective view of a hard disk drive according to a second embodiment of the present invention.

FIG. 4 is a schematic plan view of a conventional CSS hard disk drive.

FIG. 5 is a schematic enlarged view of a portion A in FIG. 4;

FIG. 6 is a schematic view taken in the direction of the arrow B as viewed from the direction B in FIG. 5;

FIG. 7 is a schematic plan view of a conventional ramp loading type hard disk drive.

FIG. 8 is a schematic enlarged view of a portion C in FIG. 7;

FIG. 9 is a schematic view taken in the direction of an arrow D as viewed from a direction D in FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Spindle motor, 3 ... Magnetic disk,
3a: CSS zone, 4: rotary actuator, 4a
... Arm, 4b suspension, 4c floating head slider, 4d coil, 4e magnet, 4f rotation center, 5 ramp, 5a taper, 6 load plate, 6a dimple, 7x, 7y, 7z …Acceleration sensor

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Takashi Yamada 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (6)

[Claims] 1. A hard disk drive for performing recording / reproduction by rotating a magnetic disk as a magnetic recording medium and moving a slider having a magnetic head in a radial direction of the magnetic disk, wherein Acceleration detecting means for detecting the detected external force, and the absolute value α (m
/ S ² ) is less than gravitational acceleration G (m / s ² ) and t (s) is α <G, and (G−α) × t
A hard disk drive having protection control means for retracting the slider from a recording / reproducing area of the magnetic disk when ≧ 1.4 (m / s). 2. The hard disk drive according to claim 1, wherein said acceleration detecting means detects at least an external force perpendicular to a main surface of said magnetic disk. 3. An acceleration detecting means for detecting an external force in a direction perpendicular to a main surface of the magnetic disk, wherein the acceleration detecting means detects an external force in a direction perpendicular to the vertical direction and perpendicular to each other. and a second acceleration detector and the third acceleration detecting means for detecting the acceleration detected by the first acceleration detecting means and alpha _z, the acceleration detected by the second acceleration detecting means and alpha _x, the acceleration detected by the third acceleration detector as alpha _y, the value of the alpha is (alpha _z ^{2 2.} The hard disk drive according to claim 1, wherein the absolute value is a value calculated by the square root of + α _x ² + α _y ² ). 4. An information processing apparatus incorporating a hard disk device for recording / reproducing by rotating a magnetic disk as a magnetic recording medium and moving a slider having a magnetic head in a radial direction of the magnetic disk. An acceleration detecting means for detecting an external force applied to the information processing apparatus, and an absolute value α (m) of the acceleration detected by the acceleration detecting means.
/ S ² ) is less than gravitational acceleration G (m / s ² ) and t (s) is α <G, and (G−α) × t
An information processing apparatus incorporating a hard disk drive, comprising: protection control means for retracting the slider from a recording / reproducing area of the magnetic disk when ≧ 1.4 (m / s). 5. The information processing apparatus according to claim 4, wherein said acceleration detecting means detects at least an external force perpendicular to a main surface of said magnetic disk. 6. A first acceleration detecting means for detecting an external force from a direction perpendicular to a main surface of the magnetic disk, wherein the acceleration detecting means detects an external force from a direction orthogonal to the vertical direction and orthogonal to each other. and a second acceleration detector and the third acceleration detecting means for detecting the acceleration detected by the first acceleration detecting means and alpha _z, the acceleration detected by the second acceleration detecting means and alpha _x, the acceleration detected by the third acceleration detector as alpha _y, the value of the alpha is (alpha _z ^{2 _{+ Α x 2 + α y 2}} ) an information processing apparatus having a built-in hard disk drive according to claim 4, characterized in that the absolute value of the value calculated by the square root of.