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公开(公告)号：US20240087602A1
公开(公告)日：2024-03-14
申请号：US18178935
申请日：2023-03-06
发明人： Masafumi IWASHIRO
IPC分类号： G11B5/596
CPC分类号： G11B5/596
摘要： According to one embodiment, first, a frequency to be corrected by an MA additional filter is specified based on a head position error spectrum and a multi-rate sensitivity characteristic, in a state before the MA additional filter is added. Then, a candidate in which a peak of the multi-rate sensitivity characteristic is equal to or less than a threshold value and a head position error is minimized is determined as the MA additional filter to be used, in a state in which each of a plurality of candidates of the MA additional filter is added.
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公开(公告)号：US20230307001A1
公开(公告)日：2023-09-28
申请号：US17900473
申请日：2022-08-31
发明人： Masafumi IWASHIRO
摘要： A disk device includes a first controller configured to determine a first operation amount of a first actuator based on a difference between a current position and a target position of a head, a second controller configured to determine a second operation amount of a second actuator based on the difference, and a processor. The processor is configured to perform a first filtering to calculate a first filter value based on a vibration detected at multiple points in time and filter coefficients, perform a second filtering to generate a second filter value based on the vibration detected at each of the multiple points in time, and update the filter coefficients based on the second filter values and a difference between the target position and an updated position of the head.
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公开(公告)号：US20140198407A1
公开(公告)日：2014-07-17
申请号：US13804412
申请日：2013-03-14
IPC分类号： G11B5/55
CPC分类号： G11B5/5547
摘要： According to one embodiment, a magnetic disk device includes: magnetic heads; a magnetic disk in which servo patterns having different write frequencies from one another are divided and recorded into a plurality of zones; and a head controller configured such that, when performing seek control of the magnetic heads based on a model position and a model velocity obtained from a model which simulates the magnetic heads, the head controller corrects the model position and the model velocity, at the time of switching of the zones, so as to reflect variation of sampling time resulting from gaps between the zones.
摘要翻译： 根据一个实施例，磁盘装置包括：磁头; 其中具有彼此具有不同写入频率的伺服图案的磁盘被分割并记录到多个区域中; 以及头控制器，其被配置为使得当基于从模拟磁头的模型获得的模型位置和模型速度执行磁头的搜索控制时，头控制器在此时校正模型位置和模型速度 以便反映由区域之间的间隙引起的采样时间的变化。
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公开(公告)号：US20180046410A1
公开(公告)日：2018-02-15
申请号：US15445846
申请日：2017-02-28
发明人： Masafumi IWASHIRO
CPC分类号： G06F3/0659 , G06F3/061 , G06F3/0611 , G06F3/0656 , G06F3/0676 , G11B5/5547
摘要： A magnetic disk device includes a magnetic disk, a magnetic head, a voice coil motor which drives movement of the magnetic head relative to the magnetic disk, a drive circuit which drives the voice coil motor, a memory in which a seek time for a seek operation is stored in association with a seek distance of the magnetic head, and a controller. The controller changes the seek time stored in the memory in association with the seek distance based on a temperature and a power supply voltage of the drive circuit.
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