公开(公告)号：WO2004013843A1

公开(公告)日：2004-02-12

申请号：PCT/US2002/040452

申请日：2002-12-18

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： HANSON, Reed ,  ELLIS, Timothy

IPC: G11B5/596

CPC classification number: G11B20/20 ,  G11B5/012 ,  G11B5/5526 ,  G11B5/59605 ,  G11B5/59616 ,  G11B5/59627

Abstract: An apparatus and method for compensation for variation in timing skew in a disc drive having at least one rotating disc is provided. A first head is positioned over a first disc surface and a second head is positioned over a second disc surface. The first disc surface includes a track having a first plurality of sectors and the second disc surface includes a track having a second plurality of sectors. Each sector of the second plurality of the sectors corresponds to a different sector of the first plurality of sectors, thereby forming a plurality of pairs of corresponding sectors. A timing skew value for each pair of corresponding sectors is computed to obtain a sequence of timing skew values (902). Data related to the sequence of timing skew values is utilized to compensate for variation in timing skew (904).

Abstract translation: 提供了一种用于补偿具有至少一个旋转盘的盘驱动器中的定时偏斜变化的装置和方法。 第一头被定位在第一盘表面上，并且第二头位于第二盘表面上方。 第一盘表面包括具有第一多个扇区的轨道，并且第二盘表面包括具有第二多个扇区的轨道。 第二多个扇区的每个扇区对应于第一多个扇区的不同扇区，从而形成多对对应的扇区。 计算每对相应扇区的定时偏移值，以获得定时偏差值序列（902）。 利用与定时偏移值序列相关的数据来补偿定时偏差的变化（904）。

公开(公告)号：WO0180242A3

公开(公告)日：2002-02-28

申请号：PCT/US0112625

申请日：2001-04-18

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： BAUMANN TODD DAVID ,  TAN EWECHYE

IPC: G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC classification number: G11B5/59627 ,  G11B5/59605 ,  G11B21/083

Abstract: The present invention is a method of correcting radial position error signal (PES) values by utilizing predetermined error correction values located at predetermined locations in advance of their associated servo fields. Calculated correction values are written to zero-acceleration path (ZAP) fields on the disc during the manufacture process. ZAP fields are positioned before the servo fields whose PES they are designed to correct. The ZAP field is comprised of two or more correction data elements to correct subsequent PES values. As the read/write head flies along a track, it reads a ZAP field, and stores the PES correction data in local random access memory (RAM). Subsequently, the corresponding servo field is read and the stored PES correction data is used to correct the PES. Two types of ZAP fields are written on the disc - one type for read operations, another type for write operations. An arrangement of ZAP fields relative to servo and data track nulls allows for the read head to gather the ZAP field information in the write position, without having to move from the write position to the read position and back to the write position in the middle of a write operation.

Abstract translation: 本发明是通过利用位于其相关伺服场之前的预定位置处的预定误差校正值来校正径向位置误差信号（PES）值的方法。 计算的校正值在制造过程中写入光盘上的零加速路径（ZAP）场。 ZAP字段位于设计用于纠正PES的伺服字段之前。 ZAP字段由两个或更多个校正数据元素组成，以校正随后的PES值。 当读/写头沿轨道飞行时，它读取ZAP字段，并将PES校正数据存储在本地随机存取存储器（RAM）中。 随后，读取相应的伺服字段，并使用存储的PES校正数据来校正PES。 光盘上写有两种类型的ZAP字段 - 一种用于读取操作，另一种用于写入操作。 ZAP字段相对于伺服和数据轨道零点的布置允许读取头在写入位置收集ZAP字段信息，而不必从写入位置移动到读取位置并返回到写入位置的中间 写操作。

公开(公告)号：WO9926238A2

公开(公告)日：1999-05-27

申请号：PCT/US9824198

申请日：1998-11-13

Applicant: CASTELWOOD SYSTEMS INC

Inventor： NGUYEN VIEN N ,  DROUIN DAVID

IPC: G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B20/10 ,  G11B5/09

CPC classification number: G11B5/5534 ,  G11B5/012 ,  G11B5/59605 ,  G11B5/59627 ,  G11B5/59683 ,  G11B20/10009

Abstract: A technique for reading data from a magnetic disk includes the steps of providing the magnetic disk including a cylinder having a plurality of servo sectors, a plurality of data sectors, and a zone data table, the plurality of servo sectors including a first servo sector, a second servo sector, a third servo sector, a fourth servo sector, and a fifth servo sector, the zone data table including at least a nominal timing latency between the fourth servo sector and a data sector from the plurality of servo sectors, reading the first servo sector, the second servo sector, the third servo sector, and the fourth servo sector from the magnetic disk, determining a first timing deviation for the first servo sector between the first servo sector and the second servo sector, determining a second timing deviation for the second servo sector between the second servo sector and the third servo sector, predicting a predicted third timing deviation for the fourth servo sector between the fourth servo sector and the fifth servo sector, in response to the first timing deviation and to the second timing deviation, modifying the nominal timing latency in response to the predicted third timing deviation to form a predicted timing latency, and waiting the predicted timing latency after reading the fourth servo sector before reading the data sector.

Abstract translation: 用于从磁盘读取数据的技术包括以下步骤：提供包括具有多个伺服扇区的圆柱体，多个数据扇区和区域数据表的磁盘，所述多个伺服扇区包括第一伺服扇区， 第二伺服扇区，第三伺服扇区，第四伺服扇区和第五伺服扇区，所述区域数据表至少包括来自多个伺服扇区的第四伺服扇区与数据扇区之间的标称定时等待时间，读取 第一伺服扇区，第二伺服扇区，第三伺服扇区和第四伺服扇区，确定第一伺服扇区与第二伺服扇区之间的第一伺服扇区的第一定时偏差，确定第二定时偏差 对于第二伺服扇区和第三伺服扇区之间的第二伺服扇区，预测在第四伺服扇区与第三伺服扇区之间的第四伺服扇区的预测的第三定时偏差 扇区和第五伺服扇区，响应于第一定时偏差和第二定时偏差，响应于预测的第三定时偏差来修改标称定时延迟，以形成预测的定时等待时间，并且在读取之后等待预测的定时等待时间 第四伺服扇区在读数据扇区之前。

公开(公告)号：WO99019866A1

公开(公告)日：1999-04-22

申请号：PCT/US1998/014611

申请日：1998-07-14

IPC: G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC classification number: G11B21/081 ,  G11B5/59605 ,  G11B5/59611 ,  G11B5/59688 ,  G11B21/083

Abstract: A method of producing a position error signal (334, 336) includes storing a normal position error value (282) generated from a normal servo field (402) and a quadrature position error value (286) generated from a quadrature servo field (404), where the normal servo field is ninety degrees out of phase from the quadrature servo field. A position error numerator (294, 298) is created by arithmetically combining the normal position error value (282) and the quadrature position error value (286). A position error denominator (306, 308) is created based on the normal position error value (282) and the quadrature position error value (286). The position error signal (334, 336) is produced by dividing the position error numerator (294, 298) by the position error denominator (306, 308).

Abstract translation: 产生位置误差信号（334,336）的方法包括存储从正常伺服字段（402）生成的正常位置误差值（282）和从正交伺服字段（404）生成的正交位置误差值（286） ，其中正常伺服场与正交伺服场相差90度。 通过算术组合正常位置误差值（282）和正交位置误差值（286）来创建位置误差分子（294,298）。 基于正常位置误差值（282）和正交位置误差值（286）创建位置误差分母（306,308）。 通过将位置误差分子（294,298）除以位置误差分母（306,308）来产生位置误差信号（334,336）。

公开(公告)号：WO1998026410A1

公开(公告)日：1998-06-18

申请号：PCT/IB1997001512

申请日：1997-12-04

Applicant: PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  KALFS, Johannes, Jozef, Wilhelmus ,  HOOGENDOORN, Abraham

IPC: G11B05/265

CPC classification number: G11B15/087 ,  G11B5/00817 ,  G11B5/4886 ,  G11B5/4893 ,  G11B5/5526 ,  G11B5/5565 ,  G11B5/5582 ,  G11B5/58 ,  G11B5/584 ,  G11B5/59605 ,  G11B5/59627 ,  G11B5/5965 ,  G11B5/59688 ,  G11B5/78 ,  G11B5/82 ,  G11B15/52 ,  G11B25/063 ,  G11B33/14

Abstract: The invention relates to a system comprising a magnetic tape (310) formatted by means of a write head (360), and an apparatus comprising a magnetic head unit (320) which is movable on a transverse direction (y) by means of an actuator. By means of the write head (360) the magnetic tape (310) has been provided with a pattern of servotracks ST101-ST127 which extend in a longitudinal direction (x). The odd-numbered servotracks contain a first servosignal and the even-numbered servotracks contain a second servosignal Sb which is phase opposition to the first servosignal. The servotracks ST103-ST113 and ST116-ST126 have a typical width W1 and form a group of two bands of N1 servotracks which are separated by a band of N2 servotracks ST114, ST115 having a typical width W2. The magnetic tape (310) is adapted to cooperate with an apparatus comprising eight magnetic write heads (H31-H38). The actuator is controlled in response to the servosignals read by the heads. The center-to-center distance (p) between the magnetic write heads (H31-H38) is equal to four times the typical width W1 and, moreover, it holds that: N2 = 2, 4, 6 etc. and W2=(k+1/2)W1 or N2 = 1, 3, 5 etc. and W2=2k.W1, where k = 1, 2 etc.

Abstract translation: 本发明涉及一种包括通过写入头（360）格式化的磁带（310）的系统，以及包括磁头单元（320）的设备，该磁头单元可通过致动器在横向（y）上移动 。 通过写入头（360），磁带（310）已经设置有沿纵向方向（x）延伸的伺服轨迹ST101-ST127的图案。 奇数伺服机构包含第一伺服信号，偶数伺服机构包含与第一伺服信号相反的第二伺服信号Sb。 伺服电机ST103-ST113和ST116-ST126具有典型的宽度W1，并形成由具有典型宽度W2的N2伺服磁带ST114，ST115的频带分离的N1个伺服磁带的一组两个频带。 磁带（310）适于与包括八个磁写头（H31-H38）的装置配合。 响应于头读取的伺服信号来控制致动器。 磁写头（H31-H38）之间的中心到中心距离（p）等于典型宽度W1的四倍，此外，它保持：N2 = 2,4,6等，W2 =（ k + 1/2）W1或N2 = 1,3,5等，W2 = 2k.W1，其中k = 1,2等。

公开(公告)号：WO1988007255A1

公开(公告)日：1988-09-22

申请号：PCT/US1988000543

申请日：1988-02-29

Applicant: UNISYS CORPORATION

Inventor： UNISYS CORPORATION ,  REVELS, William, R.

IPC: G11B21/10

CPC classification number: G11B21/106 ,  G11B5/59605

Abstract: Disclosed is a fine positioning arrangement for track follow servo means in a disk drive arrangement wherein servo head output is processed logically to indicate violation by the head of a near-boundary or a far-boundary for prescribed times to indicate whether the transducer is truly ''on-center'' or not and to logically exclude noise and other error conditions that might compromise this indication.

公开(公告)号：WO0180242B1

公开(公告)日：2002-03-28

申请号：PCT/US0112625

申请日：2001-04-18

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： BAUMANN TODD DAVID ,  TAN EWECHYE

IPC: G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC classification number: G11B5/59627 ,  G11B5/59605 ,  G11B21/083

Abstract: The present invention is a method of correcting radial position error signal (PES) values by utilizing predetermined error correction values located at predetermined locations in advance of their associated servo fields. Calculated correction values are written to zero-acceleration path (ZAP) fields on the disc during the manufacture process. ZAP fields are positioned before the servo fields whose PES they are designed to correct. The ZAP field is comprised of two or more correction data elements to correct subsequent PES values. As the read/write head flies along a track, it reads a ZAP field, and stores the PES correction data in local random access memory (RAM). Subsequently, the corresponding servo field is read and the stored PES correction data is used to correct the PES. Two types of ZAP fields are written on the disc - one type for read operations, another type for write operations. An arrangement of ZAP fields relative to servo and data track nulls allows for the read head to gather the ZAP field information in the write position, without having to move from the write position to the read position and back to the write position in the middle of a write operation.

Abstract translation: 本发明是通过利用位于其相关联的伺服磁场之前的预定位置处的预定误差校正值来校正径向位置误差信号（PES）值的方法。 计算的校正值在制造过程中写入盘上的零加速度路径（ZAP）场。 ZAP字段位于其设计用于校正的PES的伺服字段之前。 ZAP字段由两个或更多个校正数据元素组成，以校正随后的PES值。 当读/写头沿轨道飞行时，它读取ZAP字段，并将PES校正数据存储在本地随机存取存储器（RAM）中。 随后，读取对应的伺服字段，并使用存储的PES校正数据来校正PES。 两种类型的ZAP字段写在光盘上 - 一种类型用于读取操作，另一种类型用于写入操作。 相对于伺服和数据轨迹零点的ZAP场的布置允许读取头在写入位置收集ZAP场信息，而不必从写入位置移动到读取位置并返回写入位置 一个写操作。

公开(公告)号：WO00063888A3

公开(公告)日：2002-01-24

申请号：PCT/US2000/010462

申请日：2000-04-19

IPC: F16C32/04 ,  F16C39/06 ,  G11B5/48 ,  G11B5/55 ,  G11B5/588 ,  G11B5/596 ,  G11B21/02

CPC classification number: F16C32/0451 ,  F16C2370/12 ,  G11B5/4813 ,  G11B5/5582 ,  G11B5/588 ,  G11B5/59605

Abstract: Apparatus and method for controlling position of a head (120) in a disc drive (100), the head supported by a rotary actuator (110) which is in turn magnetically levitated by an active magnetic bearing assembly (112). A servo control circuit (16) applies current to an actuator coil (113) to rotate the actuator and an active magnetic bearing control circuit (168) applies currents to bearing coils (208) to levitate the actuator. When an external disturbance is applied to the actuator, the active magnetic bearing control circuit provides a bearing translation (BT) signal to the servo control circuit to adjust the current applied to the actuator coil to compensate for the disturbance. Contrawise, when the servo control circuit initiates a seek operation, a seek expectancy (SE) signal is provided to the active magnetic bearing control circuit to adjust the currents to the bearing coils to compensate for the resulting torque forces on the actuator.

Abstract translation: 用于控制盘驱动器（100）中的头部（120）的位置的装置和方法，所述头部由旋转致动器（110）支撑，旋转致动器（110）又由主动磁轴承组件（112）磁悬浮。 伺服控制电路（16）向致动器线圈（113）施加电流以旋转致动器，并且主动磁轴承控制电路（168）向轴承线圈（208）施加电流以使致动器悬浮。 当对致动器施加外部干扰时，主动磁轴承控制电路向伺服控制电路提供轴承平移（BT）信号，以调整施加到致动器线圈的电流以补偿干扰。 相反，当伺服控制电路启动寻道操作时，向主动磁轴承控制电路提供寻求预期（SE）信号，以调整到轴承线圈的电流，以补偿致动器上产生的扭矩力。

公开(公告)号：WO0063888A2

公开(公告)日：2000-10-26

申请号：PCT/US0010462

申请日：2000-04-19

Applicant: SEAGATE TECHNOLOGY

Inventor： ELL TRAVIS E

IPC: F16C32/04 ,  F16C39/06 ,  G11B5/48 ,  G11B5/55 ,  G11B5/588 ,  G11B5/596 ,  G11B21/02 ,  G11B5/00

CPC classification number: F16C32/0451 ,  F16C2370/12 ,  G11B5/4813 ,  G11B5/5582 ,  G11B5/588 ,  G11B5/59605

Abstract: Apparatus and method for controlling position of a head (120) in a disc drive (100), the head supported by a rotary actuator (110) which is in turn magnetically levitated by an active magnetic bearing assembly (112). A servo control circuit (16) applies current to an actuator coil (113) to rotate the actuator and an active magnetic bearing control circuit (168) applies currents to bearing coils (208) to levitate the actuator. When an external disturbance is applied to the actuator, the active magnetic bearing control circuit provides a bearing translation (BT) signal to the servo control circuit to adjust the current applied to the actuator coil to compensate for the disturbance. Contrawise, when the servo control circuit initiates a seek operation, a seek expectancy (SE) signal is provided to the active magnetic bearing control circuit to adjust the currents to the bearing coils to compensate for the resulting torque forces on the actuator.

Abstract translation: 用于控制盘驱动器（100）中的头部（120）的位置的装置和方法，所述头部由旋转致动器（110）支撑，旋转致动器（110）又由主动磁轴承组件（112）磁悬浮。 伺服控制电路（16）向致动器线圈（113）施加电流以旋转致动器，并且主动磁轴承控制电路（168）向轴承线圈（208）施加电流以使致动器悬浮。 当对致动器施加外部干扰时，主动磁轴承控制电路向伺服控制电路提供轴承平移（BT）信号，以调整施加到致动器线圈的电流以补偿干扰。 相反，当伺服控制电路启动寻道操作时，向主动磁轴承控制电路提供寻求预期（SE）信号，以调整到轴承线圈的电流，以补偿致动器上产生的扭矩力。

公开(公告)号：WO99022369A1

公开(公告)日：1999-05-06

申请号：PCT/US1998/013134

申请日：1998-06-29

IPC: G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC classification number: G11B21/085 ,  G11B5/59605 ,  G11B5/59627

Abstract: A method and apparatus for compensating for repeatable run-out errors in a disc drive (100) is disclosed. The compensation (228) is created by determining transfer function values for a servo loop (232) in the drive (100) as well as a sequence of repeatable run-out values for a portion of a disc. The repeatable run-out values are divided by respective transfer function values to produce compensation values that are inverse transformed to produce time-domain compensation values (228). These time-domain compensation values (228) are injected into the servo loop (232) to compensate for repeatable run-out errors.

Abstract translation: 公开了一种用于补偿盘驱动器（100）中可重复的跳动误差的方法和装置。 补偿（228）通过确定驱动器（100）中的伺服回路（232）的传递函数值以及盘的一部分的可重复耗尽值的序列来产生。 可重复的耗尽值被相应的传递函数值除以产生被逆变换以产生时域补偿值的补偿值（228）。 这些时域补偿值（228）被注入到伺服回路（232）中以补偿可重复的跳动误差。