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1. 发明授权

US07113354B2 Media noise low-fly height test for a disc drive 失效
公开(公告)号：US07113354B2
公开(公告)日：2006-09-26
申请号：US10255363
申请日：2002-09-25
申请人： Housan Dakroub , Alfredo Gay Sam
发明人： Housan Dakroub , Alfredo Gay Sam
IPC分类号： G11B5/02 , G11B15/46 , G11B27/36 , G11B21/02
CPC分类号： G11B27/36 , G11B5/5521 , G11B5/6005 , G11B27/34 , G11B2005/0018 , G11B2220/20
摘要： Method and apparatus for characterizing the flight characteristics of a read/write head. A disc is accelerated to a selected rotational velocity sufficient to aerodynamically support the head. The head is positioned over a portion of the disc non-accessible to customer data and a magnetoresistive element of the read/write is biased using a suitable voltage or current. A media noise landing signature obtained as the element transduces white noise from the surface identifies the head as a low-flying head.

2. 发明申请

US20060215309A1 Low flying head detection using readback signal amplitude modulation 审中-公开
公开(公告)号：US20060215309A1
公开(公告)日：2006-09-28
申请号：US11434100
申请日：2006-05-15
申请人： Alfredo Gay Sam , Housan Dakroub , Ghassan Abdelnour , Jeffrey Heydt
发明人： Alfredo Gay Sam , Housan Dakroub , Ghassan Abdelnour , Jeffrey Heydt
IPC分类号： G11B21/02 , G11B27/36
CPC分类号： G11B19/28 , G11B5/6029 , G11B27/34 , G11B27/36 , G11B2005/0016 , G11B2220/20
摘要： A method for determining whether a data storage device read/write head is a low-flying read/write head or a non low-flying read/write head. A disc attached to a spindle motor is accelerated to an operating rotational velocity, the head is positioned over a portion of the disc non-accessible to customer data and a data pattern of selected frequency is written. A magnetoresistive element of the is biased and the data pattern is read while the disc is decelerated to a predetermined rotational velocity threshold. Occurrence of a read signal landing signature comprising readback signal amplitude modulation prior to reaching the predetermined rotational velocity threshold identifies the head as a low-flying head. Contrawise, non-occurrence of the read signal landing signature prior to reaching the predetermined rotational velocity threshold signifies the head as a non low-flying head.

3. 发明授权

US07046463B2 Low flying head detection using readback signal amplitude modulation 有权
公开(公告)号：US07046463B2
公开(公告)日：2006-05-16
申请号：US10268343
申请日：2002-10-09
申请人： Alfredo Gay Sam , Housan Dakroub , Ghassan M. Abdelnour , Jeffrey A. Heydt
发明人： Alfredo Gay Sam , Housan Dakroub , Ghassan M. Abdelnour , Jeffrey A. Heydt
IPC分类号： G11B5/02 , G11B27/36 , G11B21/02
CPC分类号： G11B19/28 , G11B5/6029 , G11B27/34 , G11B27/36 , G11B2005/0016 , G11B2220/20
摘要： A method for determining whether a data storage device read/write head is a low-flying read/write head or a non low-flying read/write head. A disc attached to a spindle motor is accelerated to an operating rotational velocity, the head is positioned over a portion of the disc non-accessible to customer data and a data pattern of selected frequency is written. A magnetoresistive element of the is biased and the data pattern is read while the disc is decelerated to a predetermined rotational velocity threshold. Occurrence of a read signal landing signature comprising readback signal amplitude modulation prior to reaching the predetermined rotational velocity threshold identifies the head as a low-flying head. Contrawise, non-occurrence of the read signal landing signature prior to reaching the predetermined rotational velocity threshold signifies the head as a non low-flying head.

4. 发明授权

US06898034B2 Fly height measurement for a disc drive 有权
标题翻译：磁盘驱动器的飞行高度测量
公开(公告)号：US06898034B2
公开(公告)日：2005-05-24
申请号：US10112273
申请日：2002-03-27
申请人： Housan Dakroub , Mukund C. Rao , Alfredo Gay Sam
发明人： Housan Dakroub , Mukund C. Rao , Alfredo Gay Sam
IPC分类号： G11B5/60 , G11B21/21 , G11B27/36 , G11B5/09
CPC分类号： G11B5/6005 , G11B21/21 , G11B27/36
摘要： A method of measuring fly height of a read/write head to form a fly height profile for use in measuring fly height of the read/write head relative to a disc of a disc drive. A fixed source write signal is applied to an inductive element of the read/write head, generating a magnetic flux field with a stray magnetic flux field portion. A magnetoresistive element of the read/write head couples with the magnetic flux field producing an initial field strength signal. As the disc rotates, the read/write head flies there above decreasing the density of the stray magnetic flux field portion thereby decreasing the amplitude of the field strength signal. The decreasing amplitude of the field strength signal is calibrated to a predetermined operating fly height profile to correlate fly height of the read/write head to the decreasing amplitude of the field strength field, which forms the fly height profile.
摘要翻译：一种测量读/写头的飞行高度以形成飞高高度分布的方法，用于测量读/写头相对于盘驱动器的盘的飞行高度。固定的源写入信号被施加到读/写头的电感元件，产生具有杂散磁通场部分的磁通场。读/写头的磁阻元件与磁通场耦合产生初始场强信号。当盘旋转时，读/写头在那里飞过，降低了杂散磁通场部分的密度，从而减小了场强信号的幅度。场强信号的减小的幅度被校准到预定的操作飞行高度分布，以将读/写头的飞行高度与形成飞行高度分布的场强场的减小的幅度相关联。

5. 发明申请

US20130301156A1 ADJUSTING A PREAMP WRITE CURRENT TO APPLY AN ASYMMETRIC SIGNAL AT A WRITE HEAD 有权
标题翻译：调整写入电流以在写头上应用不对称信号
公开(公告)号：US20130301156A1
公开(公告)日：2013-11-14
申请号：US13469554
申请日：2012-05-11
申请人： Housan Dakroub , Todd Michael Lammers , Thomas Lee Schick
发明人： Housan Dakroub , Todd Michael Lammers , Thomas Lee Schick
IPC分类号： G11B5/09
CPC分类号： G11B5/09
摘要： A first parameter associated with a writer preamp is defined. A write current of the writer preamp is adjusted in accordance with the first parameter so that an asymmetric signal is applied at a write head. The asymmetric signal results in symmetric writing of bits to a medium.
摘要翻译：定义与写入器前置放大器相关联的第一个参数。根据第一参数来调整写入器前置放大器的写入电流，使得在写入头处施加非对称信号。不对称信号导致位对称地写入介质。

6. 发明授权

US08422172B1 Actuator trace through a die 有权
标题翻译：致动器跟踪通过一个模具
公开(公告)号：US08422172B1
公开(公告)日：2013-04-16
申请号：US12895854
申请日：2010-10-01
申请人： Housan Dakroub , Dennis Hogg
发明人： Housan Dakroub , Dennis Hogg
IPC分类号： G11B5/48
CPC分类号： G11B5/4846 , G11B5/483
摘要： A disk drive is disclosed. The disk drive comprises a disk, a head configured to write data to and read data from the disk, and an actuator configured to position the head relative to the disk. The disk drive also comprises a die including internal circuitry electrically coupled to the head and a bypass trace electrically coupled to the actuator, wherein the internal circuitry comprises one or more preamplifiers and the bypass trace is electrically isolated from the internal circuitry.
摘要翻译：公开了一种磁盘驱动器。磁盘驱动器包括一个磁盘，头部，被配置为向磁盘写入数据和从盘读取数据;以及致动器，被配置为将磁头相对于磁盘定位。磁盘驱动器还包括芯片，其包括电耦合到磁头的内部电路和电耦合到致动器的旁路迹线，其中内部电路包括一个或多个前置放大器，并且旁路迹线与内部电路电隔离。

7. 发明授权

US06466386B1 Magnetic recording using discrete pulsed write currents in a disc drive 失效
标题翻译：在磁盘驱动器中使用离散脉冲写入电流进行磁记录
公开(公告)号：US06466386B1
公开(公告)日：2002-10-15
申请号：US09470659
申请日：1999-12-22
申请人： Housan Dakroub
发明人： Housan Dakroub
IPC分类号： G11B509
CPC分类号： G11B5/09 , G11B5/012 , G11B20/10009
摘要： Apparatus and method for writing data to a magnetic recording medium in the form of magnetization vectors having alternating magnetic orientations and lengths ranging from a minimum symbol length to a maximum symbol length. A write element adjacent the medium includes a leading edge and a trailing edge to form a write gap which generates a write gap recording field having a length substantially greater than the minimum symbol length. A write driver applies a write current signal to the write element as a series of current pulses, each pulse magnetizing an area of the disc corresponding to the length of the write gap recording field. A subsequent current pulse is applied while a portion of a first area magnetized by a previous pulse remains disposed between the leading edge and the trailing edge of the write element, so that the remaining portion of the first area beyond the trailing edge of the write element forms a magnetization vector of selected symbol length.
摘要翻译：以磁化矢量的形式向磁记录介质写入数据的装置和方法，其具有从最小符号长度到最大符号长度的交替磁方向和长度。与介质相邻的写入元件包括前沿和后沿以形成写入间隙，该写入间隙产生具有大于最小符号长度的长度的写入间隙记录场。写入驱动器将写入电流信号作为一系列当前脉冲施加写入电流信号，每个脉冲磁化对应于写入间隙记录区域的长度的盘的区域。随后的当前脉冲被施加，而由先前脉冲磁化的第一区域的一部分保持设置在写入元件的前沿和后沿之间，使得第一区域的剩余部分超出写入元件的后沿形成所选符号长度的磁化矢量。

8. 发明授权

US06349009B1 Head assembly with integrated write current shaping circuit 失效
标题翻译：具有集成写入电流整形电路的头部组件
公开(公告)号：US06349009B1
公开(公告)日：2002-02-19
申请号：US09326069
申请日：1999-06-04
申请人： Housan Dakroub , Hieu V. Nguyen
发明人： Housan Dakroub , Hieu V. Nguyen
IPC分类号： G11B502
CPC分类号： G11B5/5521 , G11B5/012 , G11B5/02 , G11B5/035 , G11B5/4826 , G11B5/486 , G11B2005/0013
摘要： Apparatus for improving data writing operations to a disc recording surface of a disc drive. A head assembly is supported over the disc recording surface by a flexible suspension assembly of a controllably positionable actuator assembly and includes a write current shaping circuit integrated with a write element. The write current shaping circuit modifies write currents received by the head assembly via a transmission line from a preamplifier driver circuit to remove undesired characteristics from the received write currents. The write element writes data to the disc recording surface using the write currents as modified by the write current shaping circuit.
摘要翻译：用于改善对盘驱动器的盘记录表面的数据写入操作的装置。头组件通过可控制的致动器组件的柔性悬挂组件支撑在盘记录表面上，并且包括与写入元件集成的写入电流整形电路。写入电流整形电路通过来自前置放大器驱动器电路的传输线修改由头部组件接收的写入电流，以从接收的写入电流去除不期望的特性。写元件使用由写入电流整形电路修改的写入电流将数据写入盘记录表面。

9. 发明授权

US5999348A Data storage system having baseline shift correction 失效
标题翻译：具有基线偏移校正的数据存储系统
公开(公告)号：US5999348A
公开(公告)日：1999-12-07
申请号：US884933
申请日：1997-06-30
申请人： Housan Dakroub
发明人： Housan Dakroub
IPC分类号： G11B5/00 , G11B5/012 , G11B5/09 , G11B20/10
CPC分类号： G11B20/10203 , G11B5/012 , G11B2005/0016 , G11B5/09
摘要： A data storage apparatus is provided in which a transducer provides a read back signal. A baseline shift correction network, operably coupled to the transducer, removes baseline shift from the read back signal and provides a corrected read back signal. In addition, a disc drive utilizing baseline shift compensation circuitry is disclosed.
摘要翻译：提供一种数据存储装置，其中换能器提供回读信号。可操作地耦合到换能器的基线偏移校正网络从读回信号中去除基线偏移并提供经校正的回读信号。此外，公开了一种利用基线偏移补偿电路的磁盘驱动器。

10. 发明授权

US08687311B2 Adjusting a preamp write current to apply an asymmetric signal at a write head 有权
标题翻译：调整前置放大器写入电流以在写入头应用非对称信号
公开(公告)号：US08687311B2
公开(公告)日：2014-04-01
申请号：US13469554
申请日：2012-05-11
申请人： Housan Dakroub , Todd Michael Lammers , Thomas Lee Schick
发明人： Housan Dakroub , Todd Michael Lammers , Thomas Lee Schick
IPC分类号： G11B5/02
CPC分类号： G11B5/09
摘要： A first parameter associated with a writer preamp is defined. A write current of the writer preamp is adjusted in accordance with the first parameter so that an asymmetric signal is applied at a write head. The asymmetric signal results in symmetric writing of bits to a medium.
摘要翻译：定义与写入器前置放大器相关联的第一个参数。根据第一参数来调整写入器前置放大器的写入电流，使得在写入头处施加非对称信号。不对称信号导致位对称地写入介质。

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