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公开(公告)号：US11862196B1
公开(公告)日：2024-01-02
申请号：US17878838
申请日：2022-08-01
发明人： Richard M. Ehrlich
IPC分类号： G11B21/10
CPC分类号： G11B21/106
摘要： A method reduces the effect of accelerating/decelerating an “aggressor actuator” in a multi-actuator drive on a “victim actuator” in the drive. Measurements of fractional-wedge timing-offsets for an aggressor head are used to adjust the aggressor actuator commands that are inputted to a victim disturbance feedforward signal generator when a timing offset exists between the currently-used aggressor head and the aggressor head that was used to measure transfer functions for determining victim feedforward signals. When such a timing offset is equivalent to a specific fraction of the time period separating servo wedges, values of the aggressor actuator commands that are inputted to the victim disturbance feedforward signal generator may be modified based on the specific fraction. Feedforward signals may be modified when a timing offset exists between and the current timing of the currently-used victim head and an original timing of the currently-used victim head.
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公开(公告)号：US11694722B1
公开(公告)日：2023-07-04
申请号：US17651100
申请日：2022-02-15
发明人： Shaomin Xiong , Erhard Schreck , Robert Smith , Sukumar Rajauria
CPC分类号： G11B21/106
摘要： The present disclosure generally relates to using a data timestamp and/or a read counter to prevent data from being re-read and signal that the data has been accessed. The write assist element in the write head can be utilized to degrade the data or an allocated marker after the data has been read. The degradation functions as a read counter to indicate how many times the data has been read. Additionally and/or alternatively, a timestamp can be utilized. The timestamp is updated each time that the data has been accessed. In so doing, it is possible to determine whether data in a data storage device has been accessed.
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公开(公告)号：US20230142229A1
公开(公告)日：2023-05-11
申请号：US18152527
申请日：2023-01-10
申请人： FUJIFILM Corporation
发明人： Ren ISHIKAWA , Yuto MURATA
IPC分类号： G11B21/10
CPC分类号： G11B21/103
摘要： Provided is a magnetic tape device including: a magnetic head having a magnetic element that acts on a magnetic layer formed on a front surface of a magnetic tape; and a position adjusting actuator that adjusts a position of the magnetic element in a normal direction of the front surface by moving the magnetic head; and a processor that controls an operation of the position adjusting actuator.
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公开(公告)号：US11646060B1
公开(公告)日：2023-05-09
申请号：US17575976
申请日：2022-01-14
发明人： Takehiko Eguchi
IPC分类号： G11B21/10
CPC分类号： G11B21/106
摘要： Various illustrative aspects are directed to a system comprising: an actuator; a control object, controlled by the actuator; and one or more processing devices, configured to perform positioning control of the control object via the actuator, wherein performing the positioning control comprises: generating a trajectory control signal for a trajectory that comprises a polydyne acceleration ramp; and outputting the trajectory control signal to the actuator.
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公开(公告)号：US11646059B2
公开(公告)日：2023-05-09
申请号：US17460735
申请日：2021-08-30
CPC分类号： G11B21/106 , G06N3/04
摘要： Components are extracted from user data being read from a reader of a hard disk drive. The components collectively indicate both a magnitude and direction of a read offset of the reader over a track. The components are input to a machine-learning processor during operation of the hard disk drive, causing the machine-learning processor to produce an output. A read offset of the reader is estimated during the operation of the hard drive head based on the output of the machine learning processor. While reading the user data, a radial position of the reader over the track is adjusted via an actuator based on the estimated read offset.
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公开(公告)号：US20230091001A1
公开(公告)日：2023-03-23
申请号：US17691835
申请日：2022-03-10
发明人： Hideki HIRONAKA , Kenji ITOU
IPC分类号： G11B21/10
摘要： According to an embodiment, a magnetic disk device includes a magnetic disk, a magnetic head that accesses the magnetic disk, a motor that moves the magnetic head, a ramp, a motor driver, and a processor. When a voltage value of a power supply voltage falls below a first threshold, the motor driver starts a retract operation of retracting the magnetic head to the ramp by controlling a voltage applied to the motor. When the voltage value of the power supply voltage falls below a second threshold larger than the first threshold, the processor transmits an instruction related to applying a brake to the movement of the magnetic head to the motor driver.
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公开(公告)号：US20230046510A1
公开(公告)日：2023-02-16
申请号：US17678333
申请日：2022-02-23
发明人： Seishiro FUJIWARA
摘要： According to one embodiment, a magnetic disk device including a disk including a user data region having a first region to which data is written by shingled recording and a cache region to which data is written by normal recording and is temporarily written before writing the data in the user data region, a head, and a controller including a first saving threshold value of the number of times of writing that data is written in the radial direction of the first region for saving a track located at an end portion of the first region in the radial direction into the cache region, and a refresh threshold value of the number of times of the writing for rewriting a plurality of tracks shingled recorded in the first region.
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公开(公告)号：US20220262402A1
公开(公告)日：2022-08-18
申请号：US17396359
申请日：2021-08-06
IPC分类号： G11B21/10
摘要： Control circuitry is disclosed configured to control inner fine actuators of a first plurality of inner actuator arms and independently control a first outer fine actuator of a first outer actuator arm. Inner fine actuators of a second plurality of inner actuator arms are controlled while independently controlling a second outer fine actuator of a second outer actuator arm. Each actuator arm comprises at least one head configured to access a disk surface of a disk.
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公开(公告)号：US11195553B2
公开(公告)日：2021-12-07
申请号：US17009001
申请日：2020-09-01
申请人： Google LLC
发明人： Michele Covell , Shumeet Baluja
摘要： In accordance with some embodiments of the disclosed subject matter, mechanisms for seamless audio melding between audio items in a playlist are provided. In some embodiments, a method for transitioning between audio items in playlists is provided, comprising: identifying a sequence of audio items in a playlist of audio items, wherein the sequence of audio items includes a first audio item and a second audio item that is to be played subsequent to the first audio item; and modifying an end portion of the first audio item and a beginning portion of the second audio item, where the end portion of the first audio item and the beginning portion of the second audio item are to be played concurrently to transition between the first audio item and the second audio item, wherein the end portion of the first audio item and the beginning portion of the second audio item have an overlap duration, and wherein modifying the end portion of the first audio item and the beginning portion of the second audio item comprises: generating a first spectrogram corresponding to the end portion of the first audio item and a second spectrogram corresponding to the beginning portion of the second audio item; identifying, for each frequency band in a series of frequency bands, a window over which the first spectrogram within the end portion of the first audio item and the second spectrogram within the beginning portion of the second audio item have a particular cross-correlation; modifying, for each frequency band in the series of frequency bands, the end portion of the first spectrogram and the beginning portion of the second spectrogram such that amplitudes of frequencies within the frequency band decrease within the first spectrogram over the end portion of the first spectrogram and that amplitudes of frequencies within the frequency band increase within the second spectrogram over the beginning portion of the second spectrogram; and generating a modified version of the first audio item the includes the modified end portion of the first audio item based on the modified end portion of the first spectrogram and generating a modified version of the second audio item that includes the modified beginning portion of the second audio item based on the modified beginning portion of the second spectrogram.
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公开(公告)号：US10647891B2
公开(公告)日：2020-05-12
申请号：US16355921
申请日：2019-03-18
发明人： Kenji Furuta , Akira Hirao , Tatsuya Suzuki
摘要： Provided is a PSA sheet that has a high level of moisture resistance while maintaining good holding power with reduced gas emission. The PSA sheet provided by this invention comprises a moisture-impermeable layer and a PSA layer provided to one face of the moisture-impermeable layer. The PSA layer comprises a polymer A having a weight average molecular weight of 5×104 or higher as a base polymer and a polymer B having a number average molecular weight of 1000 or higher and a weight average molecular weight lower than 5×104.
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