摘要:
A disk device performs position control of a head. An acquiring unit acquires correction information and check information from a disk for checking the correction information. A judging unit judges whether the correction information acquired should be used for correcting position information recorded in the disk, based on the correction information acquired and the check information acquired.
摘要:
An actuator supports a head at one end of a rotatably supported shaft unit and supports a coil of a voice coil motor at the other end, and moves the head to an arbitrary track position of a recording medium. A sensor, attached to a coil support unit of the actuator, detects the coil vibration and outputs a vibration detected signal. A control unit controls the actuator to reduce a head position error signal based on the vibration detected signal of the sensor in time of seek and in time of settling of moving the head to a target track position on the medium through drive of the actuator and drawing the same. The vibration detected signal of the sensor includes bending vibration component of the coil and the twisting vibration component of the coil when the actuator is driven.
摘要:
A resonance-frequency measuring method is used for measuring a resonance frequency of an information recording/reproducing device reproducing information recorded on a medium by driving a mechanism unit. The resonance-frequency measuring method comprises the measuring step of applying sine-wave oscillations at different frequencies one by one to the mechanism unit, and counting the number of times information reproduced upon application of each of the sine-wave oscillations differs from information indicating an aimed location, and the resonance-frequency determining step of determining the resonance frequency according to the number of times counted in the measuring step.
摘要:
This invention relates to a disk drive and a method of writing data to the disk drive. In a disk drive including a write head, a read head and a positioning unit of a head which includes a write element and a read element, the present invention provides the disk drive with a position error measuring unit for measuring the amount of a position error of the write element and the read element; and a write/read control unit for obtaining an offset amount of the head in accordance with the amount of the position error of the head, setting the offset amount to the positioning unit so as to offset the head, and effecting data write/read operation. When format write operation is executed, only an ID portion is offset in the same direction as the direction of the position error so measured in accordance with the measured amount of the position error, and is written.
摘要:
A plurality of HDDs 12-1˜12-n connected around a host 10 can be made to directly communicate with each other. For example, an HDD 12-1 makes another HDD to perform long distance seek using this communication line and measures the influence of vibration caused at that time. The measurement result is formed into a transfer function indicating the position change of the head of the relevant HDD against the operation of another HDD. An HDD is actually driven by a current value obtained by correcting the normal driving current of the driving motor of the head by the transfer function.
摘要:
A disk device performs position control of a head. An acquiring unit acquires correction information and check information from a disk for checking the correction information. A judging unit judges whether the correction information acquired should be used for correcting position information recorded in the disk, based on the correction information acquired and the check information acquired.
摘要:
A head position control method performs virtual circular control which does not follow the eccentricity of a disk, and implements high precision virtual circular control, even if the servo signals of an area demodulation method are used. The method performs virtual circular control by demodulating position signals in the area demodulation method and calculates the demodulation position with the velocity offset correction of 2-phase servo signals by using both the head velocity V of the virtual circular orbit reference and the relative velocity ΔV of the virtual circular orbit and the position signal.
摘要:
According to one embodiment, there is provided a disk drive. In the disk drive, a calibration module calibrates a write condition using a first area in a sequential access area on a disk to which data is to be written next time as a calibration area if the calibration is required. A manager enters the calibration area in a management table in association with a physical address of the first area used as the calibration area. A sequential write module continues a sequential writing from a second area following the first area based on skipping the first area.
摘要:
According to one embodiment, there is provided a disk drive. In the disk drive, a calibration module calibrates a write condition using a first area in a sequential access area on a disk to which data is to be written next time as a calibration area if the calibration is required. A manager enters the calibration area in a management table in association with a physical address of the first area used as the calibration area. A sequential write module continues a sequential writing from a second area following the first area based on skipping the first area.
摘要:
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.