公开(公告)号：US07738206B1

公开(公告)日：2010-06-15

申请号：US09922459

申请日：2001-08-03

Applicant: G. Herbert Lin ,  Davidc Guarisco ,  Xiaokun Chew

Inventor： G. Herbert Lin ,  Davidc Guarisco ,  Xiaokun Chew

IPC: G11B5/02

CPC classification number: G11B19/048

Abstract: A method and apparatus for providing an early warning of thermal decay in magnetic storage media are provided. In accordance with an embodiment of the present invention, a test pattern that is particularly susceptible to thermal decay is written to a disk. The test pattern is then read, and the amplitude of the signal produced by the test pattern is stored. When testing for thermal decay is desired, the test pattern is again read, and the amplitude of the signal produced in the channel is compared to the stored amplitude. If the later amplitude is less than the stored amplitude by at least a predetermined amount, a thermal decay warning signal is generated. In accordance with another embodiment of the present invention, a test pattern is written to a portion of a disk that has been identified as being particularly susceptible to thermal decay. The amplitude produced by the test pattern is then stored so that it can later be compared to an observed amplitude when testing for thermal decay. The present invention allows remedial measures to ensure the integrity of data to be taken before data loss due to thermal decay can occur.

Abstract translation: 提供了一种用于在磁存储介质中提供热衰减的早期警告的方法和装置。 根据本发明的实施例，将特别容易受热衰减的测试图案写入盘中。 然后读取测试图案，并且存储由测试图案产生的信号的幅度。 当需要测试热衰减时，再次读取测试图案，并将通道中产生的信号的幅度与存储的幅度进行比较。 如果稍后的振幅小于存储的振幅至少预定量，则产生热衰减警告信号。 根据本发明的另一实施例，将测试图案写入已被识别为特别容易受热衰减的盘的一部分。 然后存储由测试图形产生的振幅，以便随后在测试热衰减时将其与观察到的振幅进行比较。 本发明允许补救措施以确保在可能发生由热衰减引起的数据丢失之前要进行的数据的完整性。

公开(公告)号：US07388726B1

公开(公告)日：2008-06-17

申请号：US11503354

申请日：2006-08-10

Applicant: Robert McKenzie ,  Thao Nguyen ,  Xiaokun Chew ,  Gang Herbert Lin ,  Jack Tsai ,  Bruce Schardt ,  Steven Marshall

Inventor： Robert McKenzie ,  Thao Nguyen ,  Xiaokun Chew ,  Gang Herbert Lin ,  Jack Tsai ,  Bruce Schardt ,  Steven Marshall

IPC: G11B21/02

CPC classification number: G11B5/6064 ,  G11B5/607

Abstract: A disk drive includes a slider assembly and a controller that directs current to the slider assembly to dynamically adjust the head-to-disk spacing. In one embodiment, the slider assembly includes a write element having a first end, a second end and an intermediate section, a conductor that is connected to the intermediate section. In this embodiment, the controller directs electrical current through the conductor to heat the write element without writing data to a storage disk. The electrical current can be directed through the conductor at any time prior to data transfer or during data transfer. Heating the write element causes a deformation of the slider assembly to decrease the head-to-disk spacing. In another embodiment, the slider assembly includes a separate slider deformer. Electrical current is selectively directed to the slider deformer to cause a deformation of the slider assembly to obtain a desired head-to-disk spacing. The slider deformer can include electrically conductive material or can be a piezoelectric element. Further, the slider deformer can be serpentine-shaped or substantially planar in shape.

Abstract translation: 磁盘驱动器包括滑块组件和控制器，其将电流引导到滑块组件以动态地调节磁头到磁盘的间距。 在一个实施例中，滑块组件包括具有第一端，第二端和中间部分的写入元件，连接到中间部分的导体。 在本实施例中，控制器引导电流通过导体加热写入元件而不将数据写入存储盘。 在数据传输之前或数据传输过程中，电流可以随时被导入导体。 对写入元件进行加热会导致滑块组件的变形，从而减小磁头与磁盘的间距。 在另一个实施例中，滑块组件包括单独的滑块变形器。 选择性地将电流导向滑块变形器以引起滑块组件的变形以获得期望的头对盘间距。 滑块变形器可以包括导电材料或者可以是压电元件。 此外，滑块变形器的形状可以是蛇形形状或基本上平面的。

公开(公告)号：US07253980B1

公开(公告)日：2007-08-07

申请号：US11144096

申请日：2005-06-03

Applicant: Bac Pham ,  Xiaokun Chew

Inventor： Bac Pham ,  Xiaokun Chew

IPC: G11B5/09 ,  G11B5/02

CPC classification number: G11B5/455 ,  G11B5/02 ,  G11B5/40 ,  G11B2005/0018

Abstract: Circuitry for detecting and recording latches in read bias current may include circuitry for generating a reference voltage, a pair of current to voltage converters to convert the bias and reference currents to voltage signals, a comparator to compare those two voltages, a latch to latch the compared signal, and a counter/register to count and store the number of glitches that have been detected. It may be possible to read from the register the number of detected glitches to be used in diagnosing faults in the disk drive system. In addition, it may be possible to provide a reset input to the register to zero the counter.

Abstract translation: 用于在读取偏置电流中检测和记录锁存器的电路可以包括用于产生参考电压的电路，用于将偏置和参考电流转换为电压信号的一对电流到电压转换器，用于比较这两个电压的比较器，用于锁存 比较信号，以及计数器/寄存器来计数和存储已检测到的毛刺数。 可以从寄存器读取用于诊断磁盘驱动器系统中的故障的检测到的毛刺的数量。 此外，可以向寄存器提供复位输入以使计数器为零。

公开(公告)号：US06717757B1

公开(公告)日：2004-04-06

申请号：US09579155

申请日：2000-05-25

Applicant: Llyod Levy ,  Don Brunnet ,  Xiaokun Chew

Inventor： Llyod Levy ,  Don Brunnet ,  Xiaokun Chew

IPC: G11B2736

CPC classification number: G11B27/36

Abstract: A disk drive utilizes a unique write condition for each of the transducers within the drive. Each write condition is determined based upon the specific properties of the corresponding transducer. The write condition information is preferably stored within a memory within the disk drive. When a write operation is performed, the appropriate write condition for the corresponding transducer is used to determine when to write data to the disk. A write condition will typically include one or more individual write criteria. For example, a write condition can specify a write threshold value to be used during a write operation. Similarly, a write condition can involve a combination of a write threshold and a radial transducer velocity. Other write criteria are also possible.

Abstract translation: 磁盘驱动器为驱动器内的每个传感器使用唯一的写入条件。 每个写入条件基于相应的换能器的具体特性来确定。 写条件信息优选地存储在盘驱动器内的存储器内。 当执行写入操作时，使用相应的换能器的适当写入条件来确定何时向磁盘写入数据。 写入条件通常将包括一个或多个单独的写入标准。 例如，写入条件可以指定在写入操作期间使用的写入阈值。 类似地，写入条件可以涉及写入阈值和径向换能器速度的组合。 其他写入标准也是可能的。

公开(公告)号：US07369345B1

公开(公告)日：2008-05-06

申请号：US11292831

申请日：2005-12-02

Applicant: Yunfeng Li ,  Erhard Schreck ,  Wei Guo ,  Tim Glassburn ,  Mark Heimbaugh ,  William Flynn ,  Oliver Northrup ,  John E. Scura ,  Lin Guo ,  Xiaokun Chew

Inventor： Yunfeng Li ,  Erhard Schreck ,  Wei Guo ,  Tim Glassburn ,  Mark Heimbaugh ,  William Flynn ,  Oliver Northrup ,  John E. Scura ,  Lin Guo ,  Xiaokun Chew

IPC: G11B5/54 ,  G11B21/12

CPC classification number: G11B5/5582

Abstract: A system provided for protecting a disk drive from impact damages. More specifically, a disk drive is provided that includes an accelerometer interconnected to a printed circuit board that detects free fall of the disk drive. In addition, the velocity of spinning disks of the disk drive is also monitored to assess changes in velocity thereof that may indicate the presence of a tumbling condition. Furthermore, the change in acceleration measured by the accelerometer is monitored to prevent false indications of free fall due to common vibrations. Thus an enhanced system is provided that protects disk drives from the effect of free falls under a wide variety of conditions and allowing for drops from shorter distances to be identified.

Abstract translation: 一种用于保护磁盘驱动器免受冲击损坏的系统。 更具体地，提供了一种盘驱动器，其包括与检测盘驱动器的自由落下的印刷电路板互连的加速度计。 此外，还监视磁盘驱动器的旋转磁盘的速度以评估其速度的变化，其可以指示存在翻滚状况。 此外，监测由加速度计测量的加速度变化，以防止由于共同振动引起的自由落体的错误指示。 因此，提供了一种增强的系统，其保护磁盘驱动器免受各种条件下的自由落体的影响，并允许识别较短距离的液滴。

公开(公告)号：US07092193B1

公开(公告)日：2006-08-15

申请号：US10211671

申请日：2002-08-02

Applicant: Robert McKenzie ,  Thao Nguyen ,  Xiaokun Chew ,  Gang Herbert Lin ,  Jack Tsai ,  Bruce Schardt ,  Steven Marshall

Inventor： Robert McKenzie ,  Thao Nguyen ,  Xiaokun Chew ,  Gang Herbert Lin ,  Jack Tsai ,  Bruce Schardt ,  Steven Marshall

IPC: G11B21/02

CPC classification number: G11B5/60 ,  G11B5/6064

Abstract: A disk drive includes a slider assembly and a controller that directs current to the slider assembly to dynamically adjust the head-to-disk spacing. In one embodiment, the slider assembly includes a write element having a first end, a second end and an intermediate section, a conductor that is connected to the intermediate section. In this embodiment, the controller directs electrical current through the conductor to heat the write element without writing data to a storage disk. The electrical current can be directed through the conductor at any time prior to data transfer or during data transfer. Heating the write element causes a deformation of the slider assembly to decrease the head-to-disk spacing. In another embodiment, the slider assembly includes a separate slider deformer. Electrical current is selectively directed to the slider deformer to cause a deformation of the slider assembly to obtain a desired head-to-disk spacing. The slider deformer can include electrically conductive material or can be a piezoelectric element. Further, the slider deformer can be serpentine-shaped or substantially planar in shape.

Abstract translation: 磁盘驱动器包括滑块组件和控制器，其将电流引导到滑块组件以动态地调节磁头到磁盘的间距。 在一个实施例中，滑块组件包括具有第一端，第二端和中间部分的写入元件，连接到中间部分的导体。 在本实施例中，控制器引导电流通过导体加热写入元件而不将数据写入存储盘。 在数据传输之前或数据传输过程中，电流可以随时被导入导体。 对写入元件进行加热会导致滑块组件的变形，从而减小磁头与磁盘的间距。 在另一个实施例中，滑块组件包括单独的滑块变形器。 选择性地将电流导向滑块变形器以引起滑块组件的变形以获得期望的头对盘间距。 滑块变形器可以包括导电材料或者可以是压电元件。 此外，滑块变形器的形状可以是蛇形形状或基本上平面的。