CN101504839A - 为第二磁头确定飞行高度的同时磁盘驱动器伺服停止第一磁头 - Google Patents
为第二磁头确定飞行高度的同时磁盘驱动器伺服停止第一磁头 Download PDFInfo
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- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
- G11B5/553—Details
- G11B5/5547—"Seek" control and circuits therefor
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6011—Control of flying height
- G11B5/6076—Detecting head-disk contact
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
- G11B5/59633—Servo formatting
- G11B5/59661—Spiral servo format
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Abstract
公开了一种为磁盘驱动器中的磁头选择动态飞行高度(DFH)控制设置的方法,磁盘驱动器包括多个磁盘表面和多个独立的磁头。该方法包括伺服第一磁盘表面上的第一磁头,以响应记录在第一磁盘表面上的伺服数据,为第二磁头调整DFH控制设置,以及在伺服第一磁盘表面上的第一磁头时检测第二磁头是否已经接触第二磁盘表面。
Description
背景技术
【0001】磁盘驱动器包括磁盘和连接到一驱动器臂的磁头,驱动器臂通过音圈马达(VCM)绕枢轴旋转将磁头沿径向定位在磁盘上方。磁盘包括径向隔开的多个同心磁道,用于记录用户数据扇区和伺服扇区。伺服扇区包括磁头定位信息(例如磁道地址),该信息由磁头读取并由伺服控制系统处理从而控制驱动器臂对磁道逐个查找的速度。
【0002】由于磁盘以恒定的角速度旋转,所以数据速率通常朝外径磁道的方向增长(其中磁盘的表面较快速地旋转)以达到在磁盘的径向上更为恒定的线位密度。为了简化设计思路,通常将多个数据磁道结合在一起形成多个物理区域,其中每个区域的数据速率是恒定的并且从内径区域向外径区域增长。如图1所示,示出的现有技术磁盘格式2包括多个数据磁道4,其中在此示例中多个数据磁道被结合在一起形成从磁盘的内径(ZONE1)到磁盘的外径(ZONE3)的3个物理区域。
【0003】图1的现有技术磁盘格式还包括围绕每个数据磁道的圆周记录的多个伺服扇区60-6N。每个伺服扇区6i包括前同步码8和同步标记10,前同步码8用于存储周期模式,周期模式允许对读取信号进行适当增益调整和定时同步,同步标记10将用于符号同步的具体模式存储到伺服数据字段12。伺服数据字段12存储用于在查找操作期间在目标数据磁道上定位磁头的粗磁头定位信息,诸如磁道地址。每个伺服扇区6i还包括伺服脉冲组14(例如,A、B、C和D脉冲),伺服脉冲组14包括以相对数据磁道中心线的准确间隔和偏移记录的多个连续变换。伺服脉冲组14提供用于在写/读操作期间访问数据磁道时中心线追踪的精磁头定位信息。
【0004】可利用任意适当的技术将伺服扇区60-6N写入磁盘,诸如使用外部伺服写入工具或由磁盘驱动器自伺服写入。在一个实施例中,起始磁道(seed track)被写入磁盘(例如,利用外部螺旋形的写入工具或媒体写入工具写入螺旋形的起始磁道)并被处理以将伺服扇区60-6N写入磁盘。当将伺服扇区写入磁盘时,由于磁盘的高速旋转,将在磁头和磁盘之间形成气体轴承。由于写/读信号的质量取决于磁头的飞行高度,所以传统的磁头(例如,磁组头)可包括动态飞行高度(DFH)控制器,诸如通过热膨胀或压电式(PZT)驱动器来控制飞行高度的磁头。因此,在将伺服扇区写入磁盘之前确定适当的DFH控制设置(例如,应用到磁头或PZT驱动器的适当电流)以达到磁头的目标飞行高度是令人期望的。
附图说明
【0005】图1示出了包括由多个伺服扇区限定的多个数据磁道的现有技术磁盘格式。
【0006】图2A示出了根据本发明的一个实施例的磁盘驱动器,其包括在多个磁盘表面驱动的多个磁头和控制电路。
【0007】图2B示出了磁盘驱动器的侧视图,其包括在各磁盘表面被驱动的多个磁头。
【0008】图2C是伺服停止(servo off)第一磁头时为第二磁头选择动态飞行高度(DFH)控制设置的流程图。
【0009】图3A示出了本发明的一个实施例,其中记录在第一磁盘表面上的伺服数据包括螺旋形的磁道。
【0010】图3B示出了磁头经过螺旋形的磁道时产生的一组(an envelopeof)磁道交叉信号。
【0011】图4是根据本发明的一个实施例的流程图,其中当伺服停止第一磁头时为每个磁头选择的DFH控制设置随后被用于组伺服(bankservo)写入磁盘表面。
【0012】图5示出了根据本发明的一个实施例的控制电路,其包括一个全局数字—模拟设置和为每个磁头标量化全局设置的本地标量(scalar)。
【0013】图6A是根据本发明的一个实施例的流程图,用于在为每个磁头选择本地标量设置后为所有磁头选择最佳全局数字—模拟设置。
【0014】图6B示出了根据本发明的一个实施例产生全局数字—模拟设置的公式。
具体实施方式
【0015】图2A和2B示出了根据本发明的一个实施例的磁盘驱动器,其包括多个磁盘表面和在各磁盘表面161-164上被驱动的多个磁头181-184。通过执行图2C的流程图为第二磁头选择动态飞行高度(DFH)控制设置19。第一磁头在第一磁盘表面上被伺服以响应记录在第一磁盘表面上的伺服数据(步骤20)。为第二磁头初始化DFH控制设置(步骤22),并且在伺服第一磁盘表面上的第一磁头时,产生一接触度量(contact metric)(步骤24),用于检测第二磁头是否已经接触第二磁盘表面(步骤26)。如果第二磁头还没有接触第二磁盘表面(步骤26),则调整DFH控制设置(步骤28)直至第二磁头接触第二磁盘表面(步骤26)。
【0016】图2C的流程图可以任何适当的方式实现,诸如通过连接到磁盘驱动器的测试台。在另一实施例中,磁盘驱动器内的控制电路30执行图2C的流程图以为每个磁头181-184选择DFH控制设置。
【0017】在图2A的实施例中,每个磁盘表面161-164包括由多个嵌入式伺服扇区340-34N限定的多个数据磁道32。控制电路30处理从磁头181发射的读信号36以解调伺服扇区340-34N并产生表示磁头的实际位置和相对目标数据磁道的目标位置之间的误差的定位误差信号(PES)。控制电路30通过适当的补偿滤波器滤波PES以产生控制信号38,该信号施加给使驱动器臂42A绕枢轴旋转的音圈马达(VCM)40以沿着减少PES的方向径向驱动磁盘上的磁头181。
【0018】可使用任何适当的技术检测磁头是否已经接触磁盘表面(图2C的步骤26)。适当的技术包括监测伺服系统中定位误差信号(PES)的变化、在从磁盘表面读数据时监测读信号、监测磁盘的旋转速度、监测轴(spindle)马达驱动电流或监测适当的传感器(诸如与磁头结合的压电式传感器)。此外,可以利用任何适当技术调整磁头的飞行高度(图2C的步骤28),诸如调整通过热膨胀控制飞行高度的加热器或调整与磁头结合的压电式(PZT)致动器(其机械地调整飞行高度)。DFH控制设置还可以包括任何适当信号,诸如线性信号或脉冲宽度调制信号,并且DFH控制设置可以调整任何适当的功率成分诸如电流或电压。
【0019】也可以在与磁盘驱动器的制造和/或正常操作关联的任何适当的应用中使用本发明的实施例。在一个实施例中,通过在组伺服写入所有磁盘表面时伺服停止第一磁盘表面来伺服写入多个磁盘表面。在组伺服写入之前,通过伺服第一磁盘表面上的第一磁头以及检测每个磁头何时接触其各自的磁盘表面来为每个磁头确定目标DFH控制设置。之后每个磁头被配置相应的目标DFH控制设置从而用于组伺服写入它们的各自磁盘表面。
【0020】在一个实施例中,多个螺旋形的磁道被写入第一磁盘表面,其中图3A示出了示例性螺旋形的磁道44。每个螺旋形的磁道44包括由同步标记以同步标记间隔中断的高频率信号。当磁头经过螺旋形的磁道44时,将产生图3B所示的一组读信号,其包括被同步标记48中断的高频率信号46。当磁头沿径向方向移动时,该组将移动(向左或向右)而同步标记48保持固定。组相对同步标记48的移动(从高频率信号46中检测出)提供用于伺服磁头的停止追踪信息(定位误差信号或PES)。
【0021】在一个实施例中,当使用传统产品伺服扇区组伺服写入所有磁盘表面时(图1),被写入第一磁盘表面的螺旋形的磁道由第一磁头读取并且用于伺服所有磁头。在组伺服写入之前,通过伺服第一磁盘表面上的第一磁头以响应螺旋形的磁道,以及检测每个磁头何时接触其各自的磁盘表面,来为每个磁头确定目标DFH控制设置。
【0022】图4是根据本发明的一个实施例的流程图,其用于组伺服写入多个磁盘表面。在第一磁盘表面上伺服第一磁头(步骤50),且计数器i初始化为1(步骤52)。为第i磁头初始化DFH控制设置(步骤54),例如通过将DFH控制设置初始化为对应于最大飞行高度的设置。产生接触度量(步骤24)用于检测第i磁头是否已经接触其各自的磁盘表面(步骤26)。如果第i磁头已经接触其各自的磁盘表面(步骤26),则调整第i磁头的DFH控制设置(步骤28)直至第i磁头接触其各自的磁盘表面(步骤26)。如果在第i磁头接触其各自的磁盘表面(步骤26)之后有多个磁头要校准(步骤56),则计数器i增长(步骤58)且当在第一磁盘表面上伺服第一磁头时为下一磁头重复该过程。
【0023】在确定导致每个磁头接触其各自的磁盘表面的DFH控制设置后,为每个磁头选择操作的DFH控制设置(步骤60)。在一个实施例中,通过从导致磁头接触其各自的磁盘表面的设置中减去裕度(margin)来选择每个磁头的操作的DFH控制设置。一旦已经为每个磁头选择了操作的DFH控制设置,所有的磁盘表面可使用适当的伺服数据被组伺服写入(步骤62)。例如,在上述实施例中,当伺服停止第一磁盘表面上记录的螺旋形的磁道的第一磁头时,所有磁盘表面可以使用传统的产品伺服扇区被组伺服写入(图1)。
【0024】图5示出了根据本发明的一个实施例的控制电路,其用于为每个磁头选择DFH控制设置。数字—模拟转换器(DAC)66产生全局的数字—模拟设置64响应编程到寄存器68中的数字值G。之后,全局数字—模拟设置64被多个放大器701-70N放大用于产生施加给各自DFH控制器721-72N的控制信号以调整各个磁头的飞行高度。每个放大器701-70N的增益由存储在各个寄存器741-74N中的数字标量值Li进行配置。
【0025】在一个实施例中,执行校准过程以为每个磁头选择相对可用标量设置Li和DFH控制设置的全局数字—模拟设置。在一个实施例中,特定磁头的DFH控制设置通过设置其标量值Li为一并且之后查找导致磁头接触其各自的磁盘表面的全局数字—模拟设置来确定。参见图6A的流程图理解此实施例,其中当查找导致每个磁头的磁头/磁盘接触的全局数字—模拟设置时,在第一磁盘表面上伺服第一磁头(步骤76)。计数器i初始化为一(步骤78),全局数字—模拟设置被初始化(G=INIT),第i个磁头的标量Li被设置为一,而所有其它磁头的标量L<>i被设置为零(步骤80)。接触度量被产生(步骤82)以检测第i个磁头是否已经接触其各自的磁盘表面(步骤84)。如果第i个磁头尚未接触其各自的磁盘表面(步骤84),则全局数字—模拟设置G被增长(步骤86)直至第i个磁头接触其各自的磁盘表面(步骤84)。在第i个磁头接触其各自的磁盘表面后,将为第i个磁头保存操作的设置Pi(步骤88),诸如通过从电流全局数字—模拟设置G中减去裕度M。如果在第i磁头接触其各磁盘表面后(步骤84)后有多个磁头要校准(步骤90),则计数器i被增长(步骤92)并且在第一磁盘表面上伺服第一磁头时为下一磁头重复该过程。
【0026】在确定导致每个磁头接触其各磁盘表面的全局数字—模拟设置G后,为每个磁头选择标量设置Li(步骤94)。在一个实施例中,相对为每个磁头选择的操作设置Pi选择标量设置Li(步骤88)。考虑以下示例,四个磁头的操作的设置Pi要被确定为:
[108,93,95,135]
且可用标量设置为:
[1,0.865,0.701,0.5]
相对可用标量设置标准化每个操作的设置Pi规定:
[0.8,0.6889,0.7037,1]
为最接近标准化值的每个操作设置Pi选择可用标量设置Li规定:
[0.865,0.701,0.701,1]
一旦已经选择标量设置Li,便通过查找将以下公式最小化的设置来确定最佳全局数字—模拟设置G(步骤96):
其中,以上公式的解答如图6B所示。
【0027】在找到最佳全局数字—模拟设置G后,图5的寄存器68由此被编程,并且标量寄存器741-74N使用标量设置Li被编程,标量设置Li对应于上述标准化的操作设置Pi。之后,所有磁盘表面被组伺服写入(步骤98),例如,当伺服停止记录在第一磁盘表面上的螺旋形的磁道的第一磁头上时。
【0028】以上实施例用于为DFH控制确定最佳全局数字—模拟设置G,其可以施加给磁头的其它控制信号。例如,可以针对施加给磁头的写元件的写电流或者施加给磁头的读元件的偏置电流执行图6A的流程图。如果磁盘驱动器能够同时向多个磁盘表面写入用户数据,则可以在组伺服操作期间或常规操作期间为多个磁头同时产生写电流。类似地,可以同时为多个磁头产生偏置电流以从多个磁盘表面读取数据。在一个实施例中,重复图5的控制电路,以便可以同时配置多个控制设置(例如,DFH控制设置和写电流控制设置)。在另一实施例中,图5的电路可以被分离成适当的控制信号(例如,写电流或偏置电流)以便共享电路。
【0029】用于实现流程图的控制电路可以包括任一适当电路,诸如任一适当集成电路或多个电路、执行控制程序的指令的微处理器等等。在由每个磁盘驱动器内的控制电路30实现流程图的实施例中,控制电路30可以在读通道集成电路内或者在一个与读通道分隔的组件(诸如磁盘控制器)中实现,或者上述某些步骤可以由读通道执行而其它步骤由磁盘控制器执行。在一个实施例中,读通道和磁盘控制器实现为单独的集成电路,而在替代的实施例中,它们被装配到单集成电路或芯片上系统(SOC)中。此外,控制电路可以包括适当的前置放大器电路,其被实现为单独的集成电路、集成到读通道或磁盘控制器电路内或集成到SOC内。
【0030】在一个实施例中,控制电路30包括微处理器执行指令,该指令可被操作以使微处理器执行本文描述的流程图的步骤。该指令可以存储在任何计算机可读介质中。在一个实施例中,它们可以存储在微处理器外的非易失性半导体存储器上,或者与SOC中的微处理器集成。在另一实施例中,当磁盘驱动器被供电时,指令被存储在磁盘16上并且读到易失性半导体存储器中。
Claims (24)
1.一种为磁盘驱动器中的磁头选择动态飞行高度DFH控制设置的方法,所述磁盘驱动器包括多个磁盘表面和多个独立的磁头,所述方法包括:
伺服第一磁盘表面上的第一磁头,以响应记录在所述第一磁盘表面上的伺服数据;
为第二磁头调整第一DFH控制设置;以及
在伺服所述第一磁盘表面上的所述第一磁头时,检测所述第二磁头是否已经接触第二磁盘表面。
2.根据权利要求1所述的方法,进一步包括为所述第二磁头选择操作的DFH控制设置,以响应所调整的第一DFH控制设置。
3.根据权利要求2所述的方法,进一步包括:
为第三磁头调整第二DFH控制设置;以及
在伺服所述第一磁盘表面上的所述第一磁头时,检测所述第三磁头是否已经接触第三磁盘表面。
4.根据权利要求3所述的方法,进一步包括为所述第二磁头选择操作的DFH控制设置以及为所述第三磁头选择操作的DFH控制设置,以响应所调整的第一DFH控制设置和所调整的第二DFH控制设置。
5.根据权利要求4所述的方法,进一步包括利用所述第二磁头和第三磁头的操作的DFH控制设置来组伺服写入所述第二磁盘表面和第三磁盘表面。
6.根据权利要求2所述的方法,其中为所述第二磁头选择所述操作的DFH控制设置包括:
选择用于产生第一信号的数字-模拟设置;和
选择用于放大所述第一信号的标量设置。
7.根据权利要求3所述的方法,其中:
为所述第二磁头调整所述第一DFH控制设置包括调整用于产生第一信号的数字-模拟设置;以及
为所述第三磁头调整所述第二DFH控制设置包括调整用于产生第二信号的所述数字-模拟设置。
8.根据权利要求7所述的方法,进一步包括:
选择用于放大所述第一信号的第一标量设置;
选择用于放大所述第二信号的第二标量设置;以及
选择全局的数字-模拟设置,以响应所调整的第一DFH控制设置、所调整的第二DFH控制设置、所述第一标量设置和所述第二标量设置。
9.根据权利要求8所述的方法,其中选择所述全局的数字-模拟设置包括将以下公式最小化:
其中:
N是所述磁盘驱动器中的磁头总数;
G是所述全局的数字-模拟设置;
Pi是用于第i磁头的所调整的DFH控制设置;以及
Li是用于第i磁头的标量设置。
10.根据权利要求1所述的方法,其中所述伺服数据包括记录在所述第一磁盘表面上的多个螺旋形的磁道。
11.一种为磁盘驱动器中的多个磁头选择全局的数字-模拟设置的方法,所述磁盘驱动器包括多个磁盘表面和多个独立的磁头,所述方法包括:
为第一磁头调整第一数字-模拟设置以产生第一信号;
为第二磁头调整第二数字-模拟设置以产生第二信号;
选择用于标量所述第一信号的第一标量设置;
选择用于标量所述第二信号的第二标量设置;以及
选择所述全局的数字-模拟设置,以响应所调整的第一数字-模拟设置、所调整的第二数字-模拟设置、所述第一标量设置和所述第二标量设置。
12.一种磁盘驱动器,包括:
多个磁盘表面;
在各个磁盘表面上致动的多个磁头;和
控制电路,其可被操作从而通过以下方式为第二磁头选择动态飞行高度DFH控制设置:
伺服第一磁盘表面上的第一磁头,以响应记录在所述第一磁盘表面上的伺服数据;
为所述第二磁头调整第一DFH控制设置;以及
在伺服所述第一磁盘表面上的所述第一磁头时,检测所述第二磁头是否已经接触第二磁盘表面。
13.根据权利要求12所述磁盘驱动器,其中所述控制电路进一步可操作用于为所述第二磁头选择操作的DFH控制设置,以响应所调整的第一DFH控制设置。
14.根据权利要求13所述的磁盘驱动器,其中所述控制电路进一步可操作用于:
为第三磁头调整第二DFH控制设置;和
在伺服所述第一磁盘表面上的所述第一磁头时,检测所述第三磁头是否已经接触第三磁盘表面。
15.根据权利要求14所述的磁盘驱动器,其中所述控制电路进一步可被操作从而为所述第二磁头选择操作的DFH控制设置以及为所述第三磁头选择操作的DFH控制设置,以响应所调整的第一DFH控制设置和所调整的第二DFH控制设置。
16.根据权利要求15所述的磁盘驱动器,其中所述控制电路进一步可被操作从而利用所述第二磁头和第三磁头的所述操作的DFH控制设置来组伺服写入所述第二磁盘表面和第三磁盘表面。
17.根据权利要求13所述的磁盘驱动器,其中为所述第二磁头选择所述操作的DFH控制设置包括:
选择用于产生第一信号的数字-模拟设置;以及
选择用于放大所述第一信号的标量设置。
18.根据权利要求14所述的磁盘驱动器,其中:
为所述第二磁头调整所述第一DFH控制设置包括调整用于产生第一信号的数字-模拟设置;以及
为所述第三磁头调整所述第二DFH控制设置包括调整用于产生第二信号的所述数字-模拟设置。
19.根据权利要求18所述的磁盘驱动器,其中所述控制电路进一步可被操作从而:
选择用于放大所述第一信号的第一标量设置;
选择用于放大所述第二信号的第二标量设置;以及
选择全局的数字-模拟设置,以响应所调整的第一DFH控制设置、所调整的第二DFH控制设置、所述第一标量设置和所述第二标量设置。
20.根据权利要求19所述的磁盘驱动器,其中选择所述全局的数字-模拟设置包括将以下公式最小化:
其中:
N是所述磁盘驱动器中的磁头总数;
G是所述全局的数字-模拟设置;
Pi是用于第i磁头的所调整的DFH控制设置;以及
Li是用于所述第i磁头的标量设置。
21.根据权利要求12所述磁盘驱动器,其中所述伺服数据包括记录在所述第一磁盘表面上的多个螺旋形的磁道。
22.一种磁盘驱动器,包括:
多个磁盘表面;
在各个磁盘表面上致动的多个磁头;和
控制电路,其可被操作从而通过以下方式为所述多个磁头选择全局的数字-模拟设置:
为第一磁头调整第一数字-模拟设置以产生第一信号;
为第二磁头调整第二数字-模拟设置以产生第二信号;
选择用于标量所述第一信号的第一标量设置;
选择用于标量所述第二信号的第二标量设置;
选择所述全局的数字-模拟设置,以响应所调整的第一数字-模拟设置、所调整的第二数字-模拟设置、所述第一标量设置和所述第二标量设置。
23.根据权利要求22所述的磁盘驱动器,其中所述全局的数字-模拟设置包括DFH控制设置。
24.根据权利要求22所述的磁盘驱动器,其中所述全局的数字-模拟设置包括写电流设置。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102842311A (zh) * | 2011-06-23 | 2012-12-26 | 西部数据技术公司 | 划定数据磁道以避开热粗糙的磁盘驱动器 |
CN104795078A (zh) * | 2013-05-21 | 2015-07-22 | 西部数据技术公司 | 磁盘驱动器校准用于飞行高度致动器的动态飞行高度写入简档 |
Families Citing this family (115)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7630162B2 (en) | 2008-02-04 | 2009-12-08 | Western Digital Technologies, Inc. | Disk drive servoing off of first head while determining fly height for second head |
US8482873B1 (en) | 2008-02-18 | 2013-07-09 | Western Digital Technologies, Inc. | Disk drive employing pulse width modulation of head control signal |
US7940487B1 (en) * | 2008-06-24 | 2011-05-10 | Western Digital Technologies, Inc. | Heating a head disk assembly for a time interval prior to writing spiral servo tracks to the disk |
JP2010118131A (ja) * | 2008-11-14 | 2010-05-27 | Hitachi Global Storage Technologies Netherlands Bv | ディスク・ドライブ装置、クリアランス測定方法及びサーボ・パターンの書き込み方法 |
US8358145B1 (en) | 2009-06-19 | 2013-01-22 | Western Digital Technologies, Inc. | Self-heating integrated circuit |
US9142235B1 (en) | 2009-10-27 | 2015-09-22 | Western Digital Technologies, Inc. | Disk drive characterizing microactuator by injecting sinusoidal disturbance and evaluating feed-forward compensation values |
US8320069B1 (en) * | 2010-03-18 | 2012-11-27 | Western Digital Technologies, Inc. | Disk drive detecting positive correlation in fly height measurements |
US8144419B1 (en) | 2010-04-23 | 2012-03-27 | Western Digital Technologies, Inc. | Disk drive detecting head touchdown from microactuator signal |
US8089719B1 (en) | 2010-06-01 | 2012-01-03 | Western Digital Technologies, Inc. | Finding touchdown frequency for a head in a disk drive |
US8300338B1 (en) | 2010-09-30 | 2012-10-30 | Western Digital Technologies, Inc. | Disk drive correlating different fly height measurements to verify disk warpage |
US8760796B1 (en) | 2011-06-03 | 2014-06-24 | Western Digital Technologies, Inc. | Reducing acoustic noise in a disk drive when exiting idle mode |
US8917474B1 (en) | 2011-08-08 | 2014-12-23 | Western Digital Technologies, Inc. | Disk drive calibrating a velocity profile prior to writing a spiral track |
US8737013B2 (en) | 2011-11-16 | 2014-05-27 | Western Digital Technologies, Inc. | Disk drive selecting disturbance signal for feed-forward compensation |
US9093105B2 (en) | 2011-12-09 | 2015-07-28 | Western Digital Technologies, Inc. | Disk drive charging capacitor using motor supply voltage during power failure |
US8824081B1 (en) | 2012-03-13 | 2014-09-02 | Western Digital Technologies, Inc. | Disk drive employing radially coherent reference pattern for servo burst demodulation and fly height measurement |
US8929021B1 (en) | 2012-03-27 | 2015-01-06 | Western Digital Technologies, Inc. | Disk drive servo writing from spiral tracks using radial dependent timing feed-forward compensation |
US8922937B1 (en) | 2012-04-19 | 2014-12-30 | Western Digital Technologies, Inc. | Disk drive evaluating multiple vibration sensor outputs to enable write-protection |
US8995075B1 (en) | 2012-06-21 | 2015-03-31 | Western Digital Technologies, Inc. | Disk drive adjusting estimated servo state to compensate for transient when crossing a servo zone boundary |
US8937784B1 (en) | 2012-08-01 | 2015-01-20 | Western Digital Technologies, Inc. | Disk drive employing feed-forward compensation and phase shift compensation during seek settling |
US8947819B1 (en) | 2012-08-28 | 2015-02-03 | Western Digital Technologies, Inc. | Disk drive implementing hysteresis for primary shock detector based on a more sensitive secondary shock detector |
US8917469B1 (en) | 2012-09-13 | 2014-12-23 | Western Digital Technologies, Inc. | Disk drive correcting an error in a detected gray code |
US8922938B1 (en) | 2012-11-02 | 2014-12-30 | Western Digital Technologies, Inc. | Disk drive filtering disturbance signal and error signal for adaptive feed-forward compensation |
US8879191B1 (en) | 2012-11-14 | 2014-11-04 | Western Digital Technologies, Inc. | Disk drive modifying rotational position optimization algorithm to achieve target performance for limited stroke |
US9076490B1 (en) | 2012-12-12 | 2015-07-07 | Western Digital Technologies, Inc. | Disk drive writing radial offset spiral servo tracks by reading spiral seed tracks |
US8929022B1 (en) | 2012-12-19 | 2015-01-06 | Western Digital Technologies, Inc. | Disk drive detecting microactuator degradation by evaluating frequency component of servo signal |
US9047919B1 (en) | 2013-03-12 | 2015-06-02 | Western Digitial Technologies, Inc. | Disk drive initializing servo read channel by reading data preceding servo preamble during access operation |
US8902538B1 (en) | 2013-03-29 | 2014-12-02 | Western Digital Technologies, Inc. | Disk drive detecting crack in microactuator |
US9001454B1 (en) | 2013-04-12 | 2015-04-07 | Western Digital Technologies, Inc. | Disk drive adjusting phase of adaptive feed-forward controller when reconfiguring servo loop |
US20140320998A1 (en) | 2013-04-24 | 2014-10-30 | Western Digital Technologies, Inc. | Disk drive with improved spin-up control |
US8896957B1 (en) | 2013-05-10 | 2014-11-25 | Western Digital Technologies, Inc. | Disk drive performing spiral scan of disk surface to detect residual data |
US8953271B1 (en) | 2013-05-13 | 2015-02-10 | Western Digital Technologies, Inc. | Disk drive compensating for repeatable run out selectively per zone |
US8922931B1 (en) | 2013-05-13 | 2014-12-30 | Western Digital Technologies, Inc. | Disk drive releasing variable amount of buffered write data based on sliding window of predicted servo quality |
US8891194B1 (en) | 2013-05-14 | 2014-11-18 | Western Digital Technologies, Inc. | Disk drive iteratively adapting correction value that compensates for non-linearity of head |
US9047901B1 (en) | 2013-05-28 | 2015-06-02 | Western Digital Technologies, Inc. | Disk drive measuring spiral track error by measuring a slope of a spiral track across a disk radius |
US8830617B1 (en) | 2013-05-30 | 2014-09-09 | Western Digital Technologies, Inc. | Disk drive adjusting state estimator to compensate for unreliable servo data |
US9026728B1 (en) | 2013-06-06 | 2015-05-05 | Western Digital Technologies, Inc. | Disk drive applying feed-forward compensation when writing consecutive data tracks |
US9147418B1 (en) | 2013-06-20 | 2015-09-29 | Western Digital Technologies, Inc. | Disk drive compensating for microactuator gain variations |
US9058827B1 (en) | 2013-06-25 | 2015-06-16 | Western Digitial Technologies, Inc. | Disk drive optimizing filters based on sensor signal and disturbance signal for adaptive feed-forward compensation |
US9076471B1 (en) | 2013-07-31 | 2015-07-07 | Western Digital Technologies, Inc. | Fall detection scheme using FFS |
US9484733B1 (en) | 2013-09-11 | 2016-11-01 | Western Digital Technologies, Inc. | Power control module for data storage device |
US9064537B1 (en) | 2013-09-13 | 2015-06-23 | Western Digital Technologies, Inc. | Disk drive measuring radial offset between heads by detecting a difference between ramp contact |
US8941939B1 (en) | 2013-10-24 | 2015-01-27 | Western Digital Technologies, Inc. | Disk drive using VCM BEMF feed-forward compensation to write servo data to a disk |
US9823294B1 (en) | 2013-10-29 | 2017-11-21 | Western Digital Technologies, Inc. | Negative voltage testing methodology and tester |
US9058834B1 (en) | 2013-11-08 | 2015-06-16 | Western Digital Technologies, Inc. | Power architecture for low power modes in storage devices |
US9471072B1 (en) | 2013-11-14 | 2016-10-18 | Western Digital Technologies, Inc | Self-adaptive voltage scaling |
US9142249B1 (en) | 2013-12-06 | 2015-09-22 | Western Digital Technologies, Inc. | Disk drive using timing loop control signal for vibration compensation in servo loop |
US8970979B1 (en) | 2013-12-18 | 2015-03-03 | Western Digital Technologies, Inc. | Disk drive determining frequency response of actuator near servo sample frequency |
US8917475B1 (en) | 2013-12-20 | 2014-12-23 | Western Digital Technologies, Inc. | Disk drive generating a disk locked clock using radial dependent timing feed-forward compensation |
US8958167B1 (en) * | 2013-12-23 | 2015-02-17 | Western Digital Technologies, Inc. | Detection of disk surface irregularities in data storage devices |
US9025269B1 (en) | 2014-01-02 | 2015-05-05 | Western Digital Technologies, Inc. | Disk drive compensating for cycle slip of disk locked clock when reading mini-wedge |
US9053726B1 (en) | 2014-01-29 | 2015-06-09 | Western Digital Technologies, Inc. | Data storage device on-line adapting disturbance observer filter |
US9269386B1 (en) | 2014-01-29 | 2016-02-23 | Western Digital Technologies, Inc. | Data storage device on-line adapting disturbance observer filter |
CN104821172B (zh) | 2014-02-05 | 2018-02-13 | 株式会社东芝 | 磁盘装置、磁头放大器以及磁盘装置的控制方法 |
US9058826B1 (en) | 2014-02-13 | 2015-06-16 | Western Digital Technologies, Inc. | Data storage device detecting free fall condition from disk speed variations |
US9361939B1 (en) | 2014-03-10 | 2016-06-07 | Western Digital Technologies, Inc. | Data storage device characterizing geometry of magnetic transitions |
US9141177B1 (en) | 2014-03-21 | 2015-09-22 | Western Digital Technologies, Inc. | Data storage device employing glitch compensation for power loss detection |
US9142225B1 (en) | 2014-03-21 | 2015-09-22 | Western Digital Technologies, Inc. | Electronic system with actuator control mechanism and method of operation thereof |
US9047932B1 (en) | 2014-03-21 | 2015-06-02 | Western Digital Technologies, Inc. | Data storage device adjusting a power loss threshold based on samples of supply voltage |
US8913342B1 (en) | 2014-03-21 | 2014-12-16 | Western Digital Technologies, Inc. | Data storage device adjusting range of microactuator digital-to-analog converter based on operating temperature |
US9013825B1 (en) | 2014-03-24 | 2015-04-21 | Western Digital Technologies, Inc. | Electronic system with vibration management mechanism and method of operation thereof |
US8934186B1 (en) | 2014-03-26 | 2015-01-13 | Western Digital Technologies, Inc. | Data storage device estimating servo zone to reduce size of track address |
US9208808B1 (en) | 2014-04-22 | 2015-12-08 | Western Digital Technologies, Inc. | Electronic system with unload management mechanism and method of operation thereof |
US9208810B1 (en) | 2014-04-24 | 2015-12-08 | Western Digital Technologies, Inc. | Data storage device attenuating interference from first spiral track when reading second spiral track |
US8982490B1 (en) | 2014-04-24 | 2015-03-17 | Western Digital Technologies, Inc. | Data storage device reading first spiral track while simultaneously writing second spiral track |
US8891191B1 (en) | 2014-05-06 | 2014-11-18 | Western Digital Technologies, Inc. | Data storage device initializing read signal gain to detect servo seed pattern |
US9053712B1 (en) | 2014-05-07 | 2015-06-09 | Western Digital Technologies, Inc. | Data storage device reading servo sector while writing data sector |
US8902539B1 (en) | 2014-05-13 | 2014-12-02 | Western Digital Technologies, Inc. | Data storage device reducing seek power consumption |
US8922940B1 (en) | 2014-05-27 | 2014-12-30 | Western Digital Technologies, Inc. | Data storage device reducing spindle motor voltage boost during power failure |
US9171567B1 (en) | 2014-05-27 | 2015-10-27 | Western Digital Technologies, Inc. | Data storage device employing sliding mode control of spindle motor |
US9053727B1 (en) | 2014-06-02 | 2015-06-09 | Western Digital Technologies, Inc. | Disk drive opening spiral crossing window based on DC and AC spiral track error |
US9013824B1 (en) | 2014-06-04 | 2015-04-21 | Western Digital Technologies, Inc. | Data storage device comprising dual read sensors and dual servo channels to improve servo demodulation |
US8941945B1 (en) | 2014-06-06 | 2015-01-27 | Western Digital Technologies, Inc. | Data storage device servoing heads based on virtual servo tracks |
US8958169B1 (en) | 2014-06-11 | 2015-02-17 | Western Digital Technologies, Inc. | Data storage device re-qualifying state estimator while decelerating head |
US9350278B1 (en) | 2014-06-13 | 2016-05-24 | Western Digital Technologies, Inc. | Circuit technique to integrate voice coil motor support elements |
US9171568B1 (en) | 2014-06-25 | 2015-10-27 | Western Digital Technologies, Inc. | Data storage device periodically re-initializing spindle motor commutation sequence based on timing data |
US9007714B1 (en) | 2014-07-18 | 2015-04-14 | Western Digital Technologies Inc. | Data storage device comprising slew rate anti-windup compensation for microactuator |
US9349401B1 (en) | 2014-07-24 | 2016-05-24 | Western Digital Technologies, Inc. | Electronic system with media scan mechanism and method of operation thereof |
US9076473B1 (en) | 2014-08-12 | 2015-07-07 | Western Digital Technologies, Inc. | Data storage device detecting fly height instability of head during load operation based on microactuator response |
US9076472B1 (en) | 2014-08-21 | 2015-07-07 | Western Digital (Fremont), Llc | Apparatus enabling writing servo data when disk reaches target rotation speed |
US8982501B1 (en) | 2014-09-22 | 2015-03-17 | Western Digital Technologies, Inc. | Data storage device compensating for repeatable disturbance when commutating a spindle motor |
US9099147B1 (en) | 2014-09-22 | 2015-08-04 | Western Digital Technologies, Inc. | Data storage device commutating a spindle motor using closed-loop rotation phase alignment |
US9153283B1 (en) | 2014-09-30 | 2015-10-06 | Western Digital Technologies, Inc. | Data storage device compensating for hysteretic response of microactuator |
US9208815B1 (en) | 2014-10-09 | 2015-12-08 | Western Digital Technologies, Inc. | Data storage device dynamically reducing coast velocity during seek to reduce power consumption |
US9418689B2 (en) | 2014-10-09 | 2016-08-16 | Western Digital Technologies, Inc. | Data storage device generating an operating seek time profile as a function of a base seek time profile |
US9111575B1 (en) | 2014-10-23 | 2015-08-18 | Western Digital Technologies, Inc. | Data storage device employing adaptive feed-forward control in timing loop to compensate for vibration |
US9165583B1 (en) | 2014-10-29 | 2015-10-20 | Western Digital Technologies, Inc. | Data storage device adjusting seek profile based on seek length when ending track is near ramp |
US9245540B1 (en) | 2014-10-29 | 2016-01-26 | Western Digital Technologies, Inc. | Voice coil motor temperature sensing circuit to reduce catastrophic failure due to voice coil motor coil shorting to ground |
US9355667B1 (en) | 2014-11-11 | 2016-05-31 | Western Digital Technologies, Inc. | Data storage device saving absolute position at each servo wedge for previous write operations |
US9454212B1 (en) | 2014-12-08 | 2016-09-27 | Western Digital Technologies, Inc. | Wakeup detector |
US9251823B1 (en) | 2014-12-10 | 2016-02-02 | Western Digital Technologies, Inc. | Data storage device delaying seek operation to avoid thermal asperities |
US9286927B1 (en) | 2014-12-16 | 2016-03-15 | Western Digital Technologies, Inc. | Data storage device demodulating servo burst by computing slope of intermediate integration points |
US9129630B1 (en) | 2014-12-16 | 2015-09-08 | Western Digital Technologies, Inc. | Data storage device employing full servo sectors on first disk surface and mini servo sectors on second disk surface |
US9581978B1 (en) | 2014-12-17 | 2017-02-28 | Western Digital Technologies, Inc. | Electronic system with servo management mechanism and method of operation thereof |
US9230592B1 (en) | 2014-12-23 | 2016-01-05 | Western Digital Technologies, Inc. | Electronic system with a method of motor spindle bandwidth estimation and calibration thereof |
US9230593B1 (en) | 2014-12-23 | 2016-01-05 | Western Digital Technologies, Inc. | Data storage device optimizing spindle motor power when transitioning into a power failure mode |
US9407015B1 (en) | 2014-12-29 | 2016-08-02 | Western Digital Technologies, Inc. | Automatic power disconnect device |
US9437237B1 (en) | 2015-02-20 | 2016-09-06 | Western Digital Technologies, Inc. | Method to detect power loss through data storage device spindle speed |
US9959204B1 (en) | 2015-03-09 | 2018-05-01 | Western Digital Technologies, Inc. | Tracking sequential ranges of non-ordered data |
US9245560B1 (en) | 2015-03-09 | 2016-01-26 | Western Digital Technologies, Inc. | Data storage device measuring reader/writer offset by reading spiral track and concentric servo sectors |
US9214175B1 (en) | 2015-03-16 | 2015-12-15 | Western Digital Technologies, Inc. | Data storage device configuring a gain of a servo control system for actuating a head over a disk |
US9355676B1 (en) | 2015-03-25 | 2016-05-31 | Western Digital Technologies, Inc. | Data storage device controlling amplitude and phase of driving voltage to generate power from a spindle motor |
US9343102B1 (en) | 2015-03-25 | 2016-05-17 | Western Digital Technologies, Inc. | Data storage device employing a phase offset to generate power from a spindle motor during a power failure |
US9245577B1 (en) | 2015-03-26 | 2016-01-26 | Western Digital Technologies, Inc. | Data storage device comprising spindle motor current sensing with supply voltage noise attenuation |
US9286925B1 (en) | 2015-03-26 | 2016-03-15 | Western Digital Technologies, Inc. | Data storage device writing multiple burst correction values at the same radial location |
US9343094B1 (en) | 2015-03-26 | 2016-05-17 | Western Digital Technologies, Inc. | Data storage device filtering burst correction values before downsampling the burst correction values |
US9886285B2 (en) | 2015-03-31 | 2018-02-06 | Western Digital Technologies, Inc. | Communication interface initialization |
US9424868B1 (en) | 2015-05-12 | 2016-08-23 | Western Digital Technologies, Inc. | Data storage device employing spindle motor driving profile during seek to improve power performance |
US9396751B1 (en) | 2015-06-26 | 2016-07-19 | Western Digital Technologies, Inc. | Data storage device compensating for fabrication tolerances when measuring spindle motor current |
US9542966B1 (en) | 2015-07-09 | 2017-01-10 | Western Digital Technologies, Inc. | Data storage devices and methods with frequency-shaped sliding mode control |
US9437231B1 (en) | 2015-09-25 | 2016-09-06 | Western Digital Technologies, Inc. | Data storage device concurrently controlling and sensing a secondary actuator for actuating a head over a disk |
US9460745B1 (en) * | 2015-09-29 | 2016-10-04 | HGST Netherlands B.V. | Preheating a hard disk drive head slider for head switch seek |
US9899834B1 (en) | 2015-11-18 | 2018-02-20 | Western Digital Technologies, Inc. | Power control module using protection circuit for regulating backup voltage to power load during power fault |
US9564162B1 (en) | 2015-12-28 | 2017-02-07 | Western Digital Technologies, Inc. | Data storage device measuring resonant frequency of a shock sensor by applying differential excitation and measuring oscillation |
US9620160B1 (en) | 2015-12-28 | 2017-04-11 | Western Digital Technologies, Inc. | Data storage device measuring resonant frequency of a shock sensor by inserting the shock sensor into an oscillator circuit |
US11756582B1 (en) | 2022-05-11 | 2023-09-12 | Stmicroelectronics, Inc. | System and method for disk drive fly height measurement |
Family Cites Families (71)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1182420B (it) | 1985-02-08 | 1987-10-05 | Olivetti & Co Spa | Apparecchiatura per registrare e leggere informazioni su un disco magnetico |
DE3776928D1 (de) * | 1986-03-19 | 1992-04-09 | Fujitsu Ltd | Regelsystem zum spurzugriff fuer ein magnetplattensystem. |
US4777544A (en) | 1986-08-15 | 1988-10-11 | International Business Machine Corporation | Method and apparatus for in-situ measurement of head/recording medium clearance |
US4839754A (en) | 1987-02-26 | 1989-06-13 | Micropolis Corporation | Winchester disk drive motor circuitry |
US5130866A (en) | 1990-07-17 | 1992-07-14 | International Business Machines Corporation | Method and circuitry for in-situ measurement of transducer/recording medium clearance and transducer magnetic instability |
US5168413A (en) | 1990-11-30 | 1992-12-01 | Ibm Corporation | Transducer head flying height monitoring methods and apparatus for disk drive system |
US5594595A (en) | 1995-01-19 | 1997-01-14 | Conner Peripherals, Inc. | FM detection of slider-disk interface |
US5742446A (en) | 1995-11-08 | 1998-04-21 | Seagate Technology, Inc. | Method for detection of slider-disk contact |
KR0182952B1 (ko) | 1995-12-21 | 1999-04-15 | 김광호 | 자기 디스크 기록장치의 기록전류 제어회로와 그 최적화방법 |
JP2853686B2 (ja) | 1996-12-06 | 1999-02-03 | 日本電気株式会社 | 磁気ディスク装置及び接触検知方法 |
US5909330A (en) | 1996-12-12 | 1999-06-01 | Maxtor Corporation | Method and apparatus for detecting head flying height in a disk drive |
US6894854B1 (en) | 1996-12-12 | 2005-05-17 | Maxtor Corporation | Disk drive which detects head flying height using first and second non-overlapping data patterns with different frequencies |
US6008640A (en) | 1997-04-28 | 1999-12-28 | Seagate Technology, Inc. | Detection and measurement of head disc interference using read back signal (without acoustic emission sensor or laser doppler vibrometer) |
US6735027B2 (en) | 1998-06-02 | 2004-05-11 | Texas Instruments Incorporated | Head fly height by using the applied peak area ratio to determine signal PW50 |
US6097559A (en) | 1998-06-26 | 2000-08-01 | International Business Machines Corporation | System and method for detecting head-to-disk contact in-situ a direct access storage device using a position error signal |
US6275345B1 (en) | 1998-12-02 | 2001-08-14 | International Business Machines Corporation | System and method for estimating a frequency of slider airbearing resonance |
SG85097A1 (en) | 1998-12-09 | 2001-12-19 | Inst Data Storage | A method of determining the variation of the clearance between a magnetic transducer and a recording media during track seeking |
US6288856B1 (en) | 1999-05-26 | 2001-09-11 | International Business Machines Corporation | Real-time head-to-disk clearance measuring method and apparatus |
US6310740B1 (en) | 1999-06-29 | 2001-10-30 | Western Digital Technologies, Inc | Disk drive including N-current preamplifier for generating N-independently controlled write currents |
US6452735B1 (en) | 1999-07-19 | 2002-09-17 | Maxtor Corporation | Disk drive that monitors the flying height of a dual element transducer using a thermally induced signal during write operations |
US6417981B1 (en) | 1999-09-23 | 2002-07-09 | International Business Machines Corporation | System and method for measuring absolute transducer-medium clearance using a thermal response of an MR transducer |
WO2001041132A2 (en) | 1999-12-02 | 2001-06-07 | Seagate Technology Llc | Fly height control over patterned media |
US6525892B1 (en) * | 2000-01-28 | 2003-02-25 | Western Digital Technologies, Inc. | Method of calibrating a write current-setting for servo writing a disk drive |
JP3647708B2 (ja) | 2000-02-09 | 2005-05-18 | ヒタチグローバルストレージテクノロジーズネザーランドビーブイ | 磁気ヘッド浮上量異常検出方法、データ書込方法およびハード・ディスク・ドライブ装置 |
US6493169B1 (en) | 2000-04-19 | 2002-12-10 | Western Digital Technologies, Inc. | Disk drive employing spindle motor commutation time variation for reducing acoustic noise |
US6519102B1 (en) | 2000-04-27 | 2003-02-11 | International Business Machines Corporation | Method and apparatus for implementing an in-situ digital harmonic computation facility for direct access storage device (DASD) |
US6717764B2 (en) | 2000-06-02 | 2004-04-06 | Seagate Technology Llc | Method and apparatus for head fly height measurement |
WO2002027705A1 (en) | 2000-09-28 | 2002-04-04 | Immersion Corporation | Directional tactile feedback for haptic feedback interface devices |
US6785081B2 (en) | 2000-11-02 | 2004-08-31 | Seagate Technology Llc | Fly height detector |
JP3706015B2 (ja) | 2000-11-06 | 2005-10-12 | 株式会社日立グローバルストレージテクノロジーズ | 磁気ディスク装置およびその制御方法 |
US6608727B2 (en) | 2001-01-29 | 2003-08-19 | Hitachi Global Storage Technologies Netherlands, B.V. | Method and apparatus for determining the tribology for a head/disk interface |
US6762899B2 (en) | 2001-03-16 | 2004-07-13 | Hitachi Global Storage Technologies Netherlands B.V. | Method and apparatus for estimating the flyheight of an airbearing slider in a storage device using variable spindle velocity |
WO2002095738A1 (en) | 2001-05-22 | 2002-11-28 | Seagate Technology Llc | Method and system for measuring fly height |
US6980383B2 (en) | 2001-06-18 | 2005-12-27 | Maxtor Corporation | Monitoring of phenomena indicative of PTP in a magnetic disk drive |
US6801376B2 (en) | 2001-06-21 | 2004-10-05 | Hitachi Global Storage Technologies Netherlands B.V. | Method and apparatus for evaluating a head-disk interface condition for disk drives |
US20030002183A1 (en) | 2001-07-02 | 2003-01-02 | Fioravanti Louis J. | Head contact detector |
US7068449B2 (en) | 2001-07-16 | 2006-06-27 | Seagate Technology Llc | Slider fly control |
JP2005501358A (ja) | 2001-08-22 | 2005-01-13 | シーゲイト テクノロジー エルエルシー | 静電飛行高度制御システム及び方法 |
WO2003019559A1 (en) | 2001-08-22 | 2003-03-06 | Seagate Technology Llc | Contact detection and calibration for electrostatic fly height control in a disc drive |
US6765745B2 (en) | 2001-12-28 | 2004-07-20 | Hitachi Global Storage Technologies Netherlands, B.V. | Method and apparatus for in situ detection of high-flying sliders over customer data |
US7046463B2 (en) | 2002-03-28 | 2006-05-16 | Seagate Technology Llc | Low flying head detection using readback signal amplitude modulation |
US20030184907A1 (en) | 2002-03-29 | 2003-10-02 | Seagate Technology Llc | Method for boosting a disc drive motor stiction breakaway performance |
US6822816B2 (en) | 2002-05-23 | 2004-11-23 | Seagate Technology Llc | Electrical detection of low flying read/write head for a disc drive |
US7119990B2 (en) | 2002-05-30 | 2006-10-10 | Komag, Inc. | Storage device including a center tapped write transducer |
US6930844B2 (en) | 2003-05-19 | 2005-08-16 | Seagate Technology Llc | High precision fly height measurement |
US6992853B2 (en) | 2003-07-24 | 2006-01-31 | Hitachi Global Storage Technologies Netherlands B.V | Method and apparatus for determining modulated, amplitude ramping RRO harmonics in multi-screw clamped HDD disk/spind assembly |
US7038875B2 (en) | 2003-07-31 | 2006-05-02 | Seagate Technology Llc | Dynamic measurement of head media spacing modulation |
US7016131B2 (en) | 2003-08-29 | 2006-03-21 | Agency For Science, Technology And Research | Method and implementation of in-situ absolute head medium spacing measurement |
US7158325B1 (en) | 2003-11-06 | 2007-01-02 | Maxtor Corporation | Disk drive head touchdown detection with improved discrimination |
US7023647B2 (en) | 2003-11-17 | 2006-04-04 | Texas Instruments Incorporated | Fly height control for a read/write head in a hard disk drive |
US7068458B2 (en) | 2003-12-12 | 2006-06-27 | Texas Instruments Incorporated | Preamplifier fly height control (FHC) driver and sensing circuit |
US7092195B1 (en) | 2004-05-28 | 2006-08-15 | Western Digital (Fremont), Inc. | Method of using a magnetic write head having an internal heater |
US7376182B2 (en) | 2004-08-23 | 2008-05-20 | Microchip Technology Incorporated | Digital processor with pulse width modulation module having dynamically adjustable phase offset capability, high speed operation and simultaneous update of multiple pulse width modulation duty cycle registers |
US7253984B1 (en) | 2004-09-02 | 2007-08-07 | Maxtor Corporation | Disk drive that generates a position error signal and a fly height signal from a servo burst pattern |
US7068451B1 (en) | 2004-11-16 | 2006-06-27 | Western Digital Technologies, Inc. | Disk drive estimating a sinusoidal error in a wedge time period due to eccentricity in disk rotation |
US7095578B2 (en) | 2004-12-21 | 2006-08-22 | Iomega Corporation | Detection of fly height change in a disk drive using head drag |
US20060146437A1 (en) * | 2004-12-30 | 2006-07-06 | Andrei Khurshudov | Apparatus for detecting contact between a read-write head and the accessed disk surface in a hard disk drive |
US7375912B2 (en) | 2005-05-31 | 2008-05-20 | Texas Instruments Incorporated | Disk drive fly height control based on constant power dissipation in read/write head heaters |
US7265933B1 (en) | 2005-06-14 | 2007-09-04 | Western Digital Technologies, Inc. | Disk drive computing repeatable run out while actuator arm is pressed against crash stop |
JP2007179717A (ja) | 2005-12-01 | 2007-07-12 | Fujitsu Ltd | 接触検出装置、接触検出方法、ヘッドの製造方法 |
US7180692B1 (en) | 2005-12-27 | 2007-02-20 | Hitachi Global Storage Technologies Netherlands B.V. | System and method for calibrating and controlling a fly-height actuator in a magnetic recording disk drive |
JP2007242152A (ja) | 2006-03-09 | 2007-09-20 | Fujitsu Ltd | 磁気記録媒体、磁気記録装置及びサーボ復調回路 |
US20080030888A1 (en) * | 2006-05-22 | 2008-02-07 | Maxtor Corporate | Transducer fly height distribution range reduction |
US8730610B2 (en) | 2006-05-22 | 2014-05-20 | Seagate Technology Llc | Closed loop fly height control |
JP4589894B2 (ja) * | 2006-05-31 | 2010-12-01 | 東芝ストレージデバイス株式会社 | 磁気ディスク装置および磁気ディスク装置製造方法 |
JP4371138B2 (ja) * | 2006-11-13 | 2009-11-25 | セイコーエプソン株式会社 | 光ヘッド、その制御方法、および画像形成装置。 |
JP4805860B2 (ja) | 2007-02-05 | 2011-11-02 | 東芝ストレージデバイス株式会社 | 浮上量測定装置、記憶装置および浮上量測定方法 |
US7839595B1 (en) | 2008-01-25 | 2010-11-23 | Western Digital Technologies, Inc. | Feed forward compensation for fly height control in a disk drive |
US7630162B2 (en) | 2008-02-04 | 2009-12-08 | Western Digital Technologies, Inc. | Disk drive servoing off of first head while determining fly height for second head |
US8482873B1 (en) | 2008-02-18 | 2013-07-09 | Western Digital Technologies, Inc. | Disk drive employing pulse width modulation of head control signal |
US7787210B1 (en) * | 2009-03-17 | 2010-08-31 | Headway Technologies, Inc. | Feed-forward method for repeatable runout cancellation |
-
2008
- 2008-02-04 US US12/025,676 patent/US7630162B2/en not_active Expired - Fee Related
-
2009
- 2009-01-07 CN CN2009100023337A patent/CN101504839B/zh not_active Expired - Fee Related
- 2009-10-29 US US12/608,871 patent/US8780473B1/en not_active Expired - Fee Related
- 2009-12-07 HK HK09111456.5A patent/HK1133488A1/xx not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102842311A (zh) * | 2011-06-23 | 2012-12-26 | 西部数据技术公司 | 划定数据磁道以避开热粗糙的磁盘驱动器 |
CN102842311B (zh) * | 2011-06-23 | 2015-10-28 | 西部数据技术公司 | 划定数据磁道以避开热粗糙的磁盘驱动器 |
CN104795078A (zh) * | 2013-05-21 | 2015-07-22 | 西部数据技术公司 | 磁盘驱动器校准用于飞行高度致动器的动态飞行高度写入简档 |
Also Published As
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US8780473B1 (en) | 2014-07-15 |
CN101504839B (zh) | 2012-09-05 |
HK1133488A1 (en) | 2010-03-26 |
US20090195936A1 (en) | 2009-08-06 |
US7630162B2 (en) | 2009-12-08 |
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