Abstract: A recording head for use in magnetic storage devices is disclosed. The recording head includes a transducer that is bi-directionally movable with respect to a surface of the magnetic storage medium, thereby enabling improved positioning of the transducer during recording head read and write operations. Various structures are disclosed to bi-directionally actuate the recording head transducer. In one embodiment, an interleaver assembly having a plurality of flexure assemblies employs a motor including magnetic portions for selective, bi-directional actuation. In another embodiment, electrostatic charges are employed in the flexure assemblies for selective actuation. In yet another embodiment, piezoelectric elements are included to provide for selective actuation.

Abstract: An electromagnetic field detecting element 10 includes a lamination of three insulation layers 2, 3, and 4. The dielectric breakdown strength of the insulation layer 3 is greater than the dielectric breakdown strengths of insulation layers 2 and 4. The three insulation layers 2, 3, and 4 are disposed between a pair of electrodes 5 and 6. Boundaries 7 and 8 on both ends of an overlapping region of the opposing surfaces 5a and 6a in a Z direction are apart from the insulation layer 3 by thicknesses t1 and t3 of the insulation layers 2 and 4, respectively. Between the pair of electrodes 5 and 6, ballistic current paths interposing therebetween the insulation layer 3 are formed by applying, between the pair of electrodes 5 and 6, an electric field having a magnitude which causes dielectric breakdown in the insulation layers 2 and 4 while causing no dielectric breakdown in the insulation layer 3.

Abstract: A disk-drive magnetic circuit fixing structure and fixing method for fixing a magnetic circuit to a base by means of a plurality of screws, wherein provisions are made to substantially prevent a microscopic sliding movement involving impulsive vibration from occurring at a fastening portion between the magnetic circuit and the base. More specifically, in a disk drive including a disk enclosure having a base and a cover, a magnetic head contained within the disk enclosure, and a driving coil motor for driving the magnetic head by working in combination with an actuator on which the magnetic head is mounted and a magnetic circuit disposed in the vicinity of the actuator, the magnetic circuit is fixed to the base with a single or a plurality of screws by applying in advance a lubricant forming a lubricating layer on a face where each screw contacts the magnetic circuit or the base.

Abstract: A magnetic disk device performs test write to check the state of each of heads before system information is stored in a disk and, based on the result of the test write, stores the system information sequentially with the heads from one in good state. After a predetermined time has elapsed, the magnetic disk device suspends the process of storing the system information.

Abstract: An information storage apparatus includes a disc-shaped recording medium in which control marks aligned in a predetermined rule are recorded, a head contacting or approaching a recording medium surface to reproduce/record information of the recording medium and detecting the control marks, a head driving section holding the head to move the head in a direction of coming near or away to/from a recording medium rotation center, a driving force control section controlling a driving force for head driving section, a driving time control section controlling a driving time for the head driving section using an interval of the detection of the plural control marks as a time unit, and a driving force correcting section obtaining a difference between an ideal interval based on the rule of the control marks and an actual interval of the control marks to correct the control of the driving force based on the difference.

Abstract: A hard-disk drive (HDD). The HDD includes a main control circuit. The main control circuit includes a frequency-hunting peak filter. The frequency-hunting peak filter includes a peak filter wherein a gain at a center frequency becomes finite and a reciprocal of the transfer function is represented by z/FD in z-transform space. The denominator of the transfer function of the peak filter that is represented by FD, has a real part that becomes zero at the center frequency and an imaginary part that becomes a positive number at the center frequency. In addition, the frequency-hunting peak filter includes a frequency updating unit that updates the center frequency to converge onto a frequency of disturbance by obtaining a comparative relation between the center frequency and the frequency of disturbance acting on the control system in accordance with a phase difference between an input and output of the transfer function represented by z/FD.

Abstract: A hard-disk drive. The hard-disk drive includes a magnetic-recording disk having a plurality of tracks formed thereon. The hard-disk drive also includes a magnetic-recording head configured to be positioned over a target track selected from the plurality of tracks and configured to write data to and to read data from the target track. Moreover, the hard-disk drive includes a range-definer configured to define an allowed range of a position error of the magnetic-recording head corresponding to the target track. In addition, the hard-disk drive includes a write-enabler configured to determine whether writing data by the magnetic-recording head is allowed based on the position error of the magnetic-recording head with respect to the target track and the allowed range that is calculated from data read out by the magnetic-recording head.

Abstract: A discrete track-type magnetic recording medium (30) includes a nonmagnetic substrate (1), a magnetic recording track and a servo signal pattern which are provided on at least one side of the nonmagnetic substrate, and a nonmagnetic part (4) consisting of a nonmagnetic alloy containing Si for physically separating the magnetic recording track and the servo signal pattern. A magnetic recording and reproducing device comprising, in combination, the magnetic recording medium (30), a driving part (26) serving to drive the magnetic recording medium in a direction of recording, a magnetic head (27) composed of a recording part and a reproducing part, a device (28) to impart motion to the magnetic head relative to the magnetic recording medium, and a recording and reproducing signal processing device (29) for entering a signal into the magnetic head and reproducing an output signal from the magnetic head.

Abstract: A magnetic recording circuit includes a write amplifier that supplies a recording current to a magnetic recording head, and switches a direction of the recording current in accordance with information. The magnetic recording circuit further includes a control circuit that adjusts a rising speed of the recording current.

Abstract: A magnetic head position control method is provided to control a magnetic head to follow the track on a DTM disk by accurately detecting the eccentricity compensation amount through a simple process. An angle detection unit detects ?1 at which the relative displacement between the magnetic head and the tracks on the DTM disk has a peak with no vibration data added. A vibration data calculation unit calculates first vibration data with first vibration amplitude, so that the displacement has a peak at ?2 displaced from ?1 by a predetermined value. The angle detection unit detects ?3 at which the relative displacement has a peak with the first vibration data added. A compensation data calculation unit calculates compensation data for the eccentricity of the tracks, from the detected angles ?1, ?3, the first vibration amplitude, and ?2. The position of the magnetic head is compensated according to the correction data.

Abstract: A servo-mark search control unit detects in a magnetic disk a servo mark matching a servo mark selected by a servo-mark candidate selecting unit. In this case, according to an instruction from a servo-mark search control unit, a non-volatile memory managing unit writes servo-write-mode identification information corresponding to the detected servo mark in a servo-write-mode identification-information storage unit of a non-volatile memory. In this manner, a magnetic disk device can recognize by itself a servo write mode with which servo patterns were written in a magnetic disk included in the magnetic disk device.

Abstract: A method of examining a storage disk is proposed. The method repeats steps of: executing a writing operation and a reading operation in sequence to recording tracks at first intervals so as to check a defect in the recording tracks based on the quality of a read signal; and selecting a recording track at a position spaced by a second interval larger than the first interval from a last recording track of the sequence, the recording track being a first recording track of the recording tracks at the first intervals. The method realizes detection of a defect for recording tracks at the first intervals in a concentrated manner. A recording track is then selected at a position spaced by the second interval from the sequence. A defect can reliably be detected without increasing the total number of recording tracks selected as sample tracks.

Abstract: A data storage device, that stores write data by a head, rewrites data on an adjacent track at a timing which is different from write retry of detecting a head off track when data may be written to an adjacent track. When an off track error, which affects data on an adjacent track, is generated by a write command, rewrite processing of this write command is not executed immediately, but a rewrite request including information on the track to be rewritten and the shift amount of the off track is held. And the rewrite request being held is executed at a timing which is different from the write retry. So rewrite processing can be executed after vibration, which caused the off track, stops, and the generation of an off track error during rewrite processing and the generation of further off track writing can be prevented.

Abstract: A hard disk drive with a disk that has a plurality of data fields. Each data field includes a sync field and a plurality of sync marks. Data is written onto the disk in accordance with a write clock. The write clock is generated and synchronized by the sync field and the sync marks. The sync marks are dispersed throughout the data field so that the write clock is resynchronized as data is written onto the field.

Abstract: A information storage device has a head slider having a flying height control mechanism and a recording and reproducing head, a low frequency superposed circuit that superimposes a low frequency voltage to a flying height adjustment signal to adjust the flying height of the head slider, and a polarity discrimination section that discriminates the polarity of the low frequency detection signal to the low frequency voltage through comparison of the low frequency voltage with the low frequency detection signal. When the polarity of the low frequency detection signal to the low frequency voltage is a negative polarity, the flying height adjustment signal is subtracted by a predetermined value, so that the flying height of the head slider is increased by the correspondence.

Abstract: Embodiments of the present invention provide a perpendicular magnetic recording medium that reduces the noise of granular recording layers, obtains sufficient overwrite characteristic that suppresses an increase in the magnetic cluster size, and allows high-density recording. According to one embodiment, a perpendicular magnetic recording medium comprising substrate having thereon at least soft magnetic layer, nonmagnetic intermediate layer, a perpendicular recording layer and protective layer formed in that order. The perpendicular recording layer consists of three or more layers of first recording layer, a second recording layer, and a third recording layer from the side nearer to the substrate. The first recording layer and the second recording layer have a granular structure comprising a grain boundary of an oxide surrounding ferromagnetic crystal grains containing Co and Pt, and the third recording layer has a non-granular structure mainly comprising Co and not containing an oxide.

Abstract: A disclosed magnetic disc apparatus includes a magnetic disc medium including a first part and a second part having light reflection different from light reflection of the first part; a head having a first device for detecting reflectivity on the magnetic disc medium and a second device for performing magnetic recording/playback on the magnetic disc medium; and a positioning unit configured to determine, based on the reflectivity on the magnetic disc medium detected by the first device, a position for the magnetic recording/playback performed by the second device on the magnetic disc medium.

Abstract: A method of setting a write-verify temperature of a hard disk drive having at least one disk mapped into a plurality of zones and at least one head. The method can include measuring at least one parameter related to performance of the hard disk drive for each head and each zone, and setting a critical temperature to activate a write-verify function of each head and each zone based on the at least one parameter measured for each head and each zone.

Abstract: A magnetic storage system according to one embodiment includes magnetic media containing magnetic domain tracks; and at least one head for reading from the magnetic media, each head having: a first Extraordinary Magentoresistive (EMR) device for detecting magnetic fields of a first magnetic domain track; a second EMR device for detecting magnetic fields of a second magnetic domain track. The system further includes a slider for supporting the head; and a control unit coupled to the head for controlling operation of the head. A system according to another embodiment includes a first Extraordinary Magnetoresistive (EMR) device for detecting magnetic fields of a magnetic domain of interest. A system according to yet another embodiment includes an Extraordinary Magnetoresistive (EMR) device for deriving servoing information.

Abstract: A difference value between a gain control value when a head comes into contact with a recording medium and a gain control value when the head floats with respect to the recording medium by a target floating amount is stored in advance. When the information access device is actually operated, supply power to a heater is adjusted to once bring the head into contact with the recording medium, a first gain control value adjusted by a gain control section when the head comes into contact with the recording medium is obtained, a second gain control value to be adjusted by the gain control section when the head floats from the recording medium by the target floating amount is obtained from the first gain control value and the difference value, and the supply power to the heater is adjusted such that the second gain control value is supplied to a gain variable amplifier by the gain control section.

Abstract: When impact occurs, a magnetic disk device detects the impact, being transmitted to a head, on an actuator located in a route from an impact source to the head. Upon detection of the impact, the magnetic disk device stops data write operation. Specifically, before the impact is transmitted to the head and errors occur in the write operation, the magnetic disk device detects the impact on the actuator located in the route from the impact source to the head, and stops the write operation.

Abstract: An information recording medium has a substrate, first recording dots, and second recording dots. The first recording dots are arranged in an array circumferentially in accordance with a predetermined regulation at mutual intervals in accordance with the regulation at a position in accordance with the regulation, and are used to magnetically record information. The second recording dots are arranged in an array circumferentially in accordance with the regulation at mutual intervals in accordance with the regulation. In the second recording dots, plural kinds of positions having different deviation amounts from the position in accordance with the regulation appear in one round of the array. The second recording dots are also used to magnetically record information.

Abstract: One aspect of the embodiments is related to a method of controlling a flying height of a head slider. The method includes the steps of measuring a first correlation value between an air pressure and a heating element sensitivity of the head slider, measuring a second correlation value between the air pressure and the flying height of the head slider, calculating a reference heating-element sensitivity at normal air pressure from the first correlation value, measuring a heating element sensitivity of the heating element when the head slider is lifted, calculating the difference between the heating element sensitivity and the reference heating-element sensitivity to calculate an amount of variation in air pressure from the first correlation value, and calculating an amount of variation in the flying height of the head slider from the amount of variation in air pressure and the second correlation value and controlling the heating element.

Abstract: A method for manufacturing a magnetic recording medium having a recording area includes the steps of forming in the recording area a conductive area that includes a plurality of sectors each made of a conductive magnetic body and is partitioned by a nonmagnetic insulator, and recording a reference signal in all of the plurality of sectors by continuously injecting into the conductive area spin-polarized current having a magnetization pattern corresponding to the reference signal so as to sequentially move a domain wall in the conductive area, an injecting position of the spin-polarized current being fixed while the reference signal being recorded in the plurality of sectors, the reference signal being used for a head to confirm a position on the recording area, the head being configured to record information in the recording area and to reproduce the information from the recording area.

Abstract: A head position control method controls the position of a head by correcting components synchronizing rotation of a disk based on the head control amount. A correction signal for components synchronizing rotation is generated by using a filter function. The filter function that integrates the sine and cosine terms of DFT and inverse DFT and forms multiply of the complex values a(m) and b(m) and sine and cosine for frequency conversion, is measured in advance. The complex values are the m degree of RRO frequencies having frequency characteristics to be multiplied (1+C(z) P(z)) or ?(1+C(z) P(z)/P(z)).

Abstract: A magnetic recording head includes a main magnetic pole, and a laminated body. The laminated body includes a first magnetic layer, a second magnetic layer, a first intermediate layer provided between the first magnetic layer and the second magnetic layer, and a third magnetic layer laminated with the first and second magnetic layers and the first intermediate layer. The third magnetic layer exerts a magnetic field on at least any of the first magnetic layer and the second magnetic layer. The third magnetic layer has larger saturation magnetization than at least any of the first magnetic layer and the second magnetic layer.

Abstract: A hard disk drive (HDD) includes a spindle motor, an actuator, a static eccentricity sensor, a monitor and a central controller. The spindle motor includes a rotary body and a static body adapted to support the rotary body, where the spindle motor is adapted to rotate a disk. The actuator is adapted to move a read/write head over the disk. The static eccentricity sensor is adapted to measure static eccentricity associated with the rotary body. The monitor is adapted to monitor the measured static eccentricity and generate a free-fall signal when the monitor determines that the HDD is in a free-fall state. The central controller is adapted to initiate an unloading/parking operation for the read/write head in response to the free-fall signal.

Abstract: There is provided with a positioning control system which includes: a head moving unit configured to move a head for recording or reproducing information with respect to a disk capable of recording information; a position detecting unit configured to detect a position of the head; an error detecting unit configured to detect a position error signal of a detected head position with respect to a predetermined target position; a compensation controller configured to generate control input by performing phase lead compensation and phase delay compensation for the position error signal and supply the control input to the head moving unit; and a gain controller configured to control at least one of gains the phase lead compensation and the phase delay compensation based on frequency components contained in the position error signal and an amplitude of the position error signal.

Abstract: Embodiments of the present invention precisely measure clearance variation by temperature change using a value in a RW channel. In an embodiment of the present invention, an HDD measures resolution by signals in a RW channel. The measured resolution shows variations depending on temperature according to two factors. One factor is the clearance variation depending on the temperature and the other is the variation in operational property of the RW channel depending on the temperature. The HDD compensates for the temperature variation of the resolution according to the two factors. The HDD uses two kinds of sensed temperature. One corresponds to the temperature inside an enclosure in which head sliders are provided and the other corresponds to the temperature of the chip in which the RW channel is implemented. Sensing the drive temperature and the channel temperature independently achieves precise compensation for the variation in the measured resolution caused by clearance variation and channel property.

Abstract: A hard disk drive is provided. The hard disk drive comprises a plant configured to drive the hard disk drive, a main controller configured to control the plant, and an additional controller connected in parallel with the main controller. A response function in consideration of the plant and the main controller is referred to as a main response function, and a response function in consideration of the plant and the additional controller is referred to as a first response function. The first response function cancels a function value corresponding to a section of the main response function that is associated with disturbance. The response function of the additional controller may be designed using the first response function. The hard disk drive removes a portion of the main response function to minimize the influence of the disturbance.

Abstract: A magnetic disk apparatus includes: a driving section for moving a magnetic head recoding and reproducing information in a magnetic disk; and a controller for controlling the driving section. The controller includes: a position-error feedback control system having an integrator and a phase lead compensator and obtaining a position command based on difference between target position and detection position of the magnetic head to perform feedback control of the driving section; and a two-freedom-degree control system inputting a target move distance of the magnetic head and outputting a current command to the driving section by using a mathematic model of the driving section. The controller providing the driving section with an output of the integrator and therewith updating the mathematical model by using an output of the phase lead compensator, in each of the times of positioning control and seek of the magnetic head.

Abstract: In a storage device, before activating a spindle motor (SPM) or continuously from activation until the SPM is stabilized at a target number of rotations, a voltage and temperature monitoring unit monitors the temperature in a disk enclosure unit and the voltage to be applied to an SPM driver. A current-amount limiting value calculating unit calculates an optimum current-amount limiting value not exceeding a rated current of the SPM driver, and a motor controlling unit controls the SPM driver and changes the current to be applied to the SPM so that the current does not exceed this optimum current-amount limiting value.

Abstract: Embodiments of the present invention provide disk controller operable to facilitate the efficient storage and retrieval of multiple content (data) streams to magnetic disk media. This disk controller includes an interface module, a memory module, and a processing module. The interface module is operable to couple the disk controller to a hard disk drive. The memory module and processing module in combination are operable to execute instructions that detect the geometry associated with the hard disk drive. Then the disk controller is operable to determine when the hard disk drive geometry supports assigning unique RW heads to unique content (data) streams. When the hard disk geometry supports assigning unique RW heads to unique content (data) streams, RW heads may be preferentially reserved or assigned to unique content streams wherein the RW heads are able to write unique content streams to memory locations within the hard disk drive, wherein these memory locations may be contiguous or near contiguous.

Abstract: A discrete track-type magnetic recording medium (30) includes a nonmagnetic substrate (1), a magnetic recording track and a servo signal pattern that are provided on at least one side of the nonmagnetic substrate and a part (4) nonmagnetized through implantation (7) of ions from above a mask (6) having a shape of a pattern expected to be separated for physically separating the magnetic recording track and the servo signal pattern. A magnetic recording and reproducing device includes the magnetic recording medium (30), a driving part (26) serving to drive the magnetic recording medium in a direction of recording, a magnetic head (27) composed of a recording part and a reproducing part, means (28) to impart motion to the magnetic head relative to the magnetic recording medium and recording and reproducing signal processing means (29) for entering a signal into the magnetic head and reproducing an output signal from the magnetic head.

Abstract: A disk device includes a frame, an optical pickup and a shock absorbing component. The frame has a receiving component. The optical pickup is slidable with respect to the frame. The shock absorbing component is fixedly coupled to the optical pickup and arranged to selectively contact the receiving component of the frame. The shock absorbing component includes a support portion and a spring piece. The spring piece has a first end portion that is fixedly coupled to the optical pickup and a second end portion that is spaced from the support portion in an unloaded rest state and that contacts the support portion to support the spring piece at both the first and second end portions with respect to the optical pickup when the spring piece is pushed by the receiving component of the frame to a loaded state.

Abstract: According to an aspect of an embodiment, a memory device has a medium including a plurality of tracks, each of which has a plurality of sectors separated by a plurality of servo areas, for storing data in the sectors of the tracks, a head for writing data into and reading data from the medium and a controller for determining whether the head has read out data from a sector on a target track correctly or not in reference to information obtained from servo areas sandwiching the sector and for driving the head so as to retry reading out data from the sector when the controller determines that the head failed to have read out data on the target track.

Abstract: A magnetic disk apparatus has a heater for heating a head incorporated in the magnetic disk apparatus, an atmospheric pressure detector for detecting a change in atmospheric pressure in the magnetic disk apparatus, and an adjuster for adjusting a thermal dose supplied to the head by the heater according to the change in atmospheric pressure detected by the atmospheric pressure detector.

Abstract: Embodiments of the present invention help to precisely control the clearance between a head and disk for the pressure without using a barometric sensor. In an embodiment of the present invention, an HDD determines a clearance from variations in operational parameters, and further determines a variation in pressure by deducting the clearance variation caused by a variation in temperature from the clearance. When the HDD controls the clearance in accordance with the pressure change, the HDD checks for head-disk contact. The accuracy and reliability in pressure measurement (clearance measurement) using operational parameters are not high. Therefore, confirming the pressure measurement by the presence or absence of head-disk contact eliminates head-disk contact in the following read/write operation to attain a securer margin for the clearance.

Abstract: Embodiments of the present invention relate to a method for manufacturing a magnetic disk unit, the method including a step of writing servo data into the magnetic disk while introducing a low-density gas having a lower density than air into the enclosure. In one embodiment, the magnetic disk unit is comprised of a magnetic disk, a magnetic head, and a voice coil motor which are accommodated in the hermetically sealed enclosure. The enclosure has a gas inlet and a gas outlet, which are provided respectively with filters attached thereto.

Abstract: Embodiments of the present invention help to perform appropriate servo control in response to detected vibration in a disk drive device having a vibration sensor. In an embodiment of the present invention, an HDD switches a correction servo mode to perform vibration correction in head positioning and a normal servo mode not to perform the vibration correction. The HDD performs servo positioning in either one of the serve modes and determines servo positioning accuracy in the servo mode from the measured positional error signal. The HDD obtains data indicating the servo positioning accuracy in the other servo mode from a table. The HDD compares the accuracy in the two servo modes and selects the servo mode with higher accuracy. The table contains previous measurements on servo positioning accuracy in the servo modes.

Abstract: One aspect of the embodiments utilizes a disk apparatus employing a ramp loading method, which includes a ramp member having an overlapping portion with which a part of a disk having an information recording surface and a lateral side overlaps, and a groove is formed on the entire lateral side of the disk. The disk apparatus includes a protrusion formed on a portion of the overlapping portion of the ramp member that is opposed to the lateral side of the disk and the protrusion protrudes into the groove.

Abstract: For a feedforward controller for controlling a position of a magnetic head in a magnetic disk drive, a vibration of the magnetic head is measured in a state in which a magnetic disk is rotated in the magnetic disk drive. From a spectrum of the measured vibration, a flutter frequency which is a frequency of a vibration caused by the magnetic disk fluttering is obtained. A filter is designed for each flutter frequency having a peak of a gain for a respective one of obtained flutter frequencies. The feedforward controller for controlling a position of the magnetic head is obtained by combining filters designed for the respective flutter frequencies.

Abstract: Embodiments of the present invention provide a perpendicular magnetic recoding medium capable of decreasing exchange coupling between crystal grains while suppressing increase in the crystal grain size of the magnetic recording layer. According to one embodiment, a perpendicular magnetic recoding medium is formed by stacking a seed layer, an intermediate layer, a magnetic recording layer, and a protecting layer all above a substrate. The magnetic recording layer has a granular structure constituted of a plurality of columnar grains comprising a CoCrPt alloy and a grain boundary containing an oxide.

Abstract: It relates to a hybrid recording apparatus using. The recording apparatus includes a magnetic disk medium for recording and reading data by a magnetic head, a nonvolatile memory in which a write cache area is allocated, a cache control unit for temporarily loading write data, which is recorded on the magnetic disk medium, into the write cache area in accordance with a write request from a higher-level apparatus. A memory allocation management unit stores memory management information in the magnetic disk medium for management thereof, the memory management information representing an allocated position of the write cache area in the nonvolatile memory.

Abstract: A technique for improving the performance of head alignment during reading of data from and writing data to a tape medium. An apparatus controls writing of data by a tape drive that drives a tape medium in both forward and reverse directions to record data. The apparatus includes a position obtaining unit that obtains the current position of the head of the tape drive with respect to the tape medium, a determining unit that determines whether the current position of the head is within a predetermined range on the tape medium, a generating unit that generates dummy data in response to determination that the current position of the head is not within the predetermined range, and a write control unit that writes dummy data on the tape medium until the current position of the head is within the predetermined range on the tape medium.

Abstract: A head slider is used for magnetic record by irradiating a recording medium with tiny spots of light. The head slider includes a slider main body having a bottom surface facing a recording medium and a top surface opposite to the bottom surface, an optical head provided in the slider main body to irradiate the recording medium with light and an optical layer to propagate light supplied from outside and lead the light to the optical head. The optical layer is curved along a curved surface formed in a portion of the slider main body to form a curved propagation path of light.

Abstract: A system includes a first current generator generating a first current to bias an actuator arm against a spring when a control signal is received and discontinues said first current to release said spring and accelerate said actuator arm when servo signals are generated. A second current generator generates a second current biasing said actuator arm away from said spring when said first current is discontinued.

Abstract: According to an aspect of an embodiment, a storage apparatus has a storage for storing a plurality of compensation values in association with a plurality of bit sequence patterns, a head for writing data into a medium and a controller for controlling the apparatus and driving the head, the controller determining whether to use one of the compensation values to drive the head to write an instantaneous data bit in dependence upon the immediate preceding data bits in reference to the bit sequence patterns.

Abstract: It is made possible to provide a magnetic head that can stabilize the high-frequency magnetic field generated from the spin torque oscillator. A magnetic head includes: first and second main magnetic poles; and a spin torque oscillator provided between the first and second main magnetic poles.

Abstract: The invention relates to a method of controlling movements of a positioner of a micro-scanner, the method comprising: determining the vibration resonance frequency ranges of the positioner, and performing a main scan by a controlled movement of the positioner.