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公开(公告)号：US11894025B1
公开(公告)日：2024-02-06
申请号：US18053470
申请日：2022-11-08
申请人： Marvell Asia Pte Ltd
发明人： Kai Wu , Mats Oberg , Hao Fang
IPC分类号： G11B11/105 , G11B7/00 , G11B5/012 , G11B5/49
CPC分类号： G11B5/012 , G11B5/4946
摘要： A method for writing data to a magnetic data storage medium includes detecting whether the duration, before occurrence of a data transition, of data to be written exceeds a predetermined threshold, and, when the duration, before the occurrence of the data transition, of the data to be written exceeds the predetermined threshold, writing the data by applying an initial pulse and then maintaining a steady-state write current for a defined interval, and when the duration, before the occurrence of the data transition, of the data to be written is at most equal to the predetermined threshold, writing the data by applying the initial pulse without applying a steady-state write current before the data transition. The predetermined threshold may be determined by size of a magnetic bubble formed when writing a single bit to the magnetic data storage medium. A subsequent pulse may be applied following the defined interval.
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公开(公告)号：US10984822B2
公开(公告)日：2021-04-20
申请号：US16928971
申请日：2020-07-14
发明人： Mats Oberg , Hao Fang
摘要： The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
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公开(公告)号：US11915729B1
公开(公告)日：2024-02-27
申请号：US18156852
申请日：2023-01-19
申请人： Marvell Asia Pte Ltd
发明人： Kai Wu , Hao Fang , Jorge Estuardo Licona
IPC分类号： G11B20/10 , G11B11/105 , G11B5/09
CPC分类号： G11B5/09
摘要： When writing data to a magnetic data storage medium, it is detected whether duration, before occurrence of a data transition, of data to be written exceeds a predetermined threshold. When the duration, before the transition, of the data to be written exceeds the predetermined threshold, the data is written by applying an initial pulse and then maintaining, until a shut-off pulse, a steady-state write current having an amplitude less than the initial pulse. A shut-off adjustment is determined based on a predetermined delay. The shut-off pulse is initiated at a time based on one bit period prior to the transition, adjusted by the shut-off adjustment. When the duration, before the transition, of the data to be written is at most equal to the predetermined threshold, the data is written by applying the initial pulse without applying a steady-state write current before the transition.
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公开(公告)号：US11257519B2
公开(公告)日：2022-02-22
申请号：US17143569
申请日：2021-01-07
发明人： Mats Oberg , Hao Fang
IPC分类号： G11B5/09 , G11B7/1267 , G11B5/00
摘要： A system includes a driver and a controller. The driver is configured to output a signal to a preamplifier of a heat source based on a thermal compensation value to cause the heat source to heat a spot on a storage medium. The controller is configured to adjust the thermal compensation value based on a duration for which the heat source is in an active or inactive operational state. The thermal compensation value is indicative of a history of durations that the heat source was in the active or inactive operational state.
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公开(公告)号：US20200342900A1
公开(公告)日：2020-10-29
申请号：US16928971
申请日：2020-07-14
发明人： Mats Oberg , Hao Fang
摘要： The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
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公开(公告)号：US20220189504A1
公开(公告)日：2022-06-16
申请号：US17653446
申请日：2022-03-03
发明人： Mats Oberg , Hao Fang
摘要： The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
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公开(公告)号：US20210241789A1
公开(公告)日：2021-08-05
申请号：US17234557
申请日：2021-04-19
发明人： Mats Oberg , Hao Fang
摘要： The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
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公开(公告)号：US20210125635A1
公开(公告)日：2021-04-29
申请号：US17143569
申请日：2021-01-07
发明人： Mats Oberg , Hao Fang
IPC分类号： G11B7/1267
摘要： A system includes a driver and a controller. The driver is configured to output a signal to a preamplifier of a heat source based on a thermal compensation value to cause the heat source to heat a spot on a storage medium. The controller is configured to adjust the thermal compensation value based on a duration for which the heat source is in an active or inactive operational state. The thermal compensation value is indicative of a history of durations that the heat source was in the active or inactive operational state.
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公开(公告)号：US11557316B2
公开(公告)日：2023-01-17
申请号：US17653446
申请日：2022-03-03
发明人： Mats Oberg , Hao Fang
摘要： The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
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公开(公告)号：US11270723B2
公开(公告)日：2022-03-08
申请号：US17234557
申请日：2021-04-19
发明人： Mats Oberg , Hao Fang
摘要： The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
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