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公开(公告)号：US12051450B1
公开(公告)日：2024-07-30
申请号：US18359663
申请日：2023-07-26
CPC分类号： G11B5/588 , G11B5/59672
摘要： Provided are a controller, tape drive, and method for determining a lateral position at which to move a tape head. The tape head, comprising a first module having a first servo reader and a second module having a second servo reader, is rotated to rotate the second servo reader at skew angles with respect to the first servo reader. A determination is made of estimated lateral positions of the second reader at the skew angles. Expected lateral positions of the second servo reader at the skew angles are calculated from a calculated distance between the first and the second servo readers and the skew angles. Lateral error offsets, comprising differences of estimated lateral positions and expected lateral positions at the skew angles, are added to an error offset data structure used to adjust a target lateral position at which to position the tape head.
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2.发明公开公开(公告)号：US20240170011A1
公开(公告)日：2024-05-23
申请号：US18364747
申请日：2023-08-03
发明人： Kazuaki OKAMOTO , Yousuke ISOWAKI
CPC分类号： G11B5/09 , G11B5/4886 , G11B5/59627
摘要： According to one embodiment, a data processor includes an interface section and a processor. The interface section is configured to acquire partial data relating to a control condition of a magnetic recording/reproducing device. The processor is configured to process the partial data. The processor is configured to derive a first data by processing the partial data with a first model based on characteristics of the partial data, a first resolution of the first data being higher than a partial resolution of the partial data. The processor is configured to derive a second data by processing the partial data with a second model based on the characteristic. The second model is different from the first model. A second resolution of the second data being higher than the partial resolution.
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公开(公告)号：US11990153B2
公开(公告)日：2024-05-21
申请号：US18184567
申请日：2023-03-15
发明人： Takuji Matsuzawa
CPC分类号： G11B19/20 , G11B5/59622
摘要： According to one embodiment, a magnetic disk drive includes a notch filter, a parameter storage unit and a computation unit, when the sampling period changes from a first sampling period to a second sampling period, the computation unit computes a damping ratio parameter related to the damping ratio in a second set of parameters at the second sampling period, based on a first absolute value at a first angular frequency of a first transfer function computed from a first set of parameters at the first sampling period and a second absolute value at the first angular frequency of a second transfer function computed from the first set of parameters at the second sampling period, and the notch filter is set with the second set of parameters at the second sampling period is computed.
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4.发明公开公开(公告)号：US20240153533A1
公开(公告)日：2024-05-09
申请号：US18226609
申请日：2023-07-26
发明人： Hongquan JIANG , Guanxiong LI , Ming MAO
CPC分类号： G11B5/3948 , G11B5/11 , G11B5/3163 , G11B5/3932 , G11B5/59688
摘要： The present disclosure generally relates to a dual free layer (DFL) two dimensional magnetic recording (TDMR) read head, and a method of forming thereof. The read head comprises a lower sensor, middle shields disposed on the lower sensor, and an upper sensor disposed on the middle shields. After the lower reader is formed, a dielectric layer is deposited around an outer perimeter of the lower shield. Portions of the dielectric layer are ion milled such that the remaining portions form a substantially flat layer. Another embodiment includes a deposition of a TaOx layer on the dielectric layer, where x is a numeral. Portions of the dielectric layer and the TaOx layer are then ion milled such that the remaining portions of the TaOx layer and the dielectric layer collectively form a substantially planar layer. The middle shields are formed over the lower reader and are substantially planar.
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公开(公告)号：US11942122B1
公开(公告)日：2024-03-26
申请号：US18155633
申请日：2023-01-17
发明人： Gary W. Calfee , Gabor Szita , Jiangang Liang
CPC分类号： G11B5/59666 , G01D5/248 , G11B5/59661 , G11B5/56
摘要： A method of determining radial position of a magnetic head that includes a first read sensor and a second read sensor includes: with the first read sensor, detecting a servo spiral formed on a disk; with the second read sensor, detecting the servo spiral; measuring a time interval between when the servo spiral is detected by the first read sensor and when the servo spiral is detected by the second read sensor; and based on the time interval, determining a radial position of the magnetic head relative to the disk.
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公开(公告)号：US20240096360A1
公开(公告)日：2024-03-21
申请号：US18182586
申请日：2023-03-13
发明人： Hiroshi TANI , Kazuhiko TAKAISHI
IPC分类号： G11B5/596
CPC分类号： G11B5/59688
摘要： According to one embodiment, a magnetic disk device writes a plurality of simulated reference patterns to the magnetic disk on write conditions different from each other, detects a write state of each of the simulated reference patterns, selects one of the write conditions according to detection results, and writes a plurality of regular reference patterns which become criteria for predetermined processing to be executed on the magnetic disk to the magnetic disk on the selected write condition.
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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：US11922024B2
公开(公告)日：2024-03-05
申请号：US17828727
申请日：2022-05-31
发明人： Xiong Liu , Wenxiang Xie
CPC分类号： G06F3/0617 , G06F3/0659 , G06F3/0689 , G11B5/59627
摘要： The technology disclosed herein pertains to a method for determining expected command completion time (CCT), the method including receiving a plurality of position error signals (PESs) for an HDD over a predetermined time period, determining sigma of the plurality of PESs, retrieving upper off-track limits (UOL) for one or more data sectors of the HDD, calculating average number of retrieved sectors (A) between two consecutive occurrences of the |PES|>UOL for the HDD, and determining required number of revolutions (CCT) to collect data based on the average number of retrieved data sectors (A) and a total number of requested data sectors (N).
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公开(公告)号：US11830524B1
公开(公告)日：2023-11-28
申请号：US17839011
申请日：2022-06-13
发明人： Kei Yasuna , Guoxiao Guo , Ichiro Yokokawa
CPC分类号： G11B21/08
摘要： Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuating mechanism comprising one or more heads, and configured to position the one or more heads proximate to disk surfaces of the one or more disks; and one or more processing devices. The one or more processing devices are configured to: determine a first burst value based on an averaged value of a first set of one or more bursts; determine a second burst value based on an averaged value of a second set of one or more bursts; generate a position error signal (PES) based on the determined first burst value and the determined second burst value; and control a position of at least one head among the one or more heads based on the PES.
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公开(公告)号：US20230290374A1
公开(公告)日：2023-09-14
申请号：US17888224
申请日：2022-08-15
发明人： Toshitaka MATSUNAGA
IPC分类号： G11B5/596
CPC分类号： G11B5/59661 , G11B5/59666
摘要： According to one embodiment, a magnetic disk device comprises a disk, a head that writes data to the disk and reads data from the disk, and a controller that controls a position of the head so as to write a first spiral servo pattern to the disk, and overwrite a second spiral servo pattern different from the first spiral servo pattern by shifting in a radial direction of the disk from the first spiral servo pattern.
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