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公开(公告)号：US09905251B2
公开(公告)日：2018-02-27
申请号：US15043801
申请日：2016-02-15
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Michael R. Montemorra , Ralph W. Cross , Todd M. Lammers , Quan Li , Beng Theam Ko , Kirill Rivkin , Mourad Benakli
CPC classification number: G11B5/09 , G11B5/012 , G11B20/10027 , G11B20/1217 , G11B20/1426
Abstract: Method and apparatus for enhancing write current switching efficiencies during data write operations in a data storage device. In some embodiments, write data are described in the form a sequence of symbols of nT length where T is a channel clock rate and n is an integer over a selected range. Bi-directional write currents are applied to a write element to record the sequence of symbols to a storage medium. The write currents are switched between a first rail current and a second rail current for alternating symbols. The write currents are further transitioned to an intermediate current value for at least one channel clock period immediately preceding a next occurrence of a symbol boundary between an adjacent pair of symbols in the sequence.
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公开(公告)号：US08953275B2
公开(公告)日：2015-02-10
申请号：US13919207
申请日：2013-06-17
Applicant: Seagate Technology LLC
Inventor： Andy Chou , Quan Li , Chee Wee Cheng , Beng Theam Ko , Myint Ngwe
CPC classification number: G11B5/6076 , G11B5/607
Abstract: A method for detecting a contact event between a transducer and a recording medium is disclosed. The method includes positioning a transducer with respect to a recording medium, where the transducer includes a writer, a reader, a heater, and a thermally responsive sensor. The method further includes applying power to the heater to establish a fly height of the transducer; supplying a bias current through the thermally responsive sensor to generate a bias signal; measuring a root mean square (RMS) voltage VRMS of the thermally responsive sensor based on the bias signal; determining a threshold voltage VT; and detecting a contact event between the transducer and the medium based on VRMS being greater than VT.
Abstract translation: 公开了一种用于检测换能器和记录介质之间的接触事件的方法。 该方法包括相对于记录介质定位换能器，其中换能器包括写入器，读取器，加热器和热响应传感器。 该方法还包括向加热器施加电力以建立换能器的飞行高度; 通过所述热响应传感器提供偏置电流以产生偏置信号; 基于偏置信号测量热响应传感器的均方根（RMS）电压VRMS; 确定阈值电压VT; 并且基于VRMS大于VT，检测换能器和介质之间的接触事件。
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公开(公告)号：US20170236534A1
公开(公告)日：2017-08-17
申请号：US15043801
申请日：2016-02-15
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Michael R. Montemorra , Ralph W. Cross , Todd M. Lammers , Quan Li , Beng Theam Ko , Kirill Rivkin , Mourad Benakli
CPC classification number: G11B5/09 , G11B5/012 , G11B20/10027 , G11B20/1217 , G11B20/1426
Abstract: Method and apparatus for enhancing write current switching efficiencies during data write operations in a data storage device. In some embodiments, write data are described in the form a sequence of symbols of nT length where T is a channel clock rate and n is an integer over a selected range. Bi-directional write currents are applied to a write element to record the sequence of symbols to a storage medium. The write currents are switched between a first rail current and a second rail current for alternating symbols. The write currents are further transitioned to an intermediate current value for at least one channel clock period immediately preceding a next occurrence of a symbol boundary between an adjacent pair of symbols in the sequence.
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公开(公告)号：US20140368946A1
公开(公告)日：2014-12-18
申请号：US13919207
申请日：2013-06-17
Applicant: Seagate Technology LLC
Inventor： Andy Chou , Quan Li , Chee Wee Cheng , Beng Theam Ko , Myint Ngwe
CPC classification number: G11B5/6076 , G11B5/607
Abstract: A method for detecting a contact event between a transducer and a recording medium is disclosed. The method includes positioning a transducer with respect to a recording medium, where the transducer includes a writer, a reader, a heater, and a thermally responsive sensor. The method further includes applying power to the heater to establish a fly height of the transducer; supplying a bias current through the thermally responsive sensor to generate a bias signal; measuring a root mean square (RMS) voltage VRMS of the thermally responsive sensor based on the bias signal; determining a threshold voltage VT; and detecting a contact event between the transducer and the medium based on VRMS being greater than VT.
Abstract translation: 公开了一种用于检测换能器和记录介质之间的接触事件的方法。 该方法包括相对于记录介质定位换能器，其中换能器包括写入器，读取器，加热器和热响应传感器。 该方法还包括向加热器施加电力以建立换能器的飞行高度; 通过所述热响应传感器提供偏置电流以产生偏置信号; 基于偏置信号测量热响应传感器的均方根（RMS）电压VRMS; 确定阈值电压VT; 并且基于VRMS大于VT，检测换能器和介质之间的接触事件。
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