公开(公告)号：EP0139531A3

公开(公告)日：1987-04-22

申请号：EP84307200

申请日：1984-10-19

Applicant: MEMOREX CORPORATION

Inventor： El-Sadi, Ashraf Ibrahim

IPC: G11B05/596 ,  G11B21/10 ,  G05B05/01 ,  G05D03/00

CPC classification number: G05D3/14 ,  G11B5/59622 ,  G11B21/106 ,  H03H11/1217

Abstract: Described is a novel technique and associated arrangement for determining the noise-free value of a system parameter (e.g., head position in a disk drive) which is time variable and (usually) has a noise component as detected. The technique involves processing the (as detected) noise-including value and passing it through "Second Order/ Summing" filter means. For instance, the technique is described as particularly useful with the "track-following servo" (part of the transducer positioning means) in a high density disk file (where track density is higher than usual) to secure superior head- displacement error values which are more noise-free. Thus, (see Figure 4), a pair of first values V 8 , V b are secured by detecting motor current sense voltage V i , integrating it with respect to time and passing the result through a pair of novel "second order filter" means - one hand-pass (F 1 ), the other low-pass (F 2 ); while also securing a third value V c by detecting position error (signal voltage, including noise components) in the usual manner and passing it through a "second order low-pass" filter F 3 ; then algebraically summing these to secure a relatively noise-free position error signal V xo Thus, the summing filter array gates the position-error voltage but attenuates the (mechanical) noise component (cf. filters F 2 , F 1 centered at w o - e.g., 600 Hz is satisfactory here). Such "second order" filters are novel in themselves, and particularly as so applied (most especially as so-used in such a servo system).

公开(公告)号：EP0145962A3

公开(公告)日：1987-03-18

申请号：EP84113745

申请日：1984-11-14

Applicant: FUJITSU LIMITED

Inventor： Mizoshita, Yoshifumi ,  Hasegawa, Susumu

IPC: G11B05/596 ,  G11B21/10

CPC classification number: G11B5/59655 ,  G11B21/106

Abstract: With a servo system for positioning a transducer of a rotatable storage apparatus over a servo tracks of a magnetic disk, a method for processing trains of positioning pulse signals is provided. With a fixed duration time, a reference voltage, changing with time, having a predetermined pattern is generated and compared with a train of the positioning pulse signals contained in the duration time. The magnitude of the positioning signals which varies with the displacement of the transducer from a guide path to be followed is given by counting the number of the positioning signals exceeding the reference voltage pattern. Thus, an error signal for the servo system is fed back in a digital form. The method causes cost reduction of the apparatus because of its simplicity and flexibility for the users' demand.

公开(公告)号：WO1998041981A1

公开(公告)日：1998-09-24

申请号：PCT/US1997004072

申请日：1997-03-14

Applicant: SEAGATE TECHNOLOGY, INC. ,  MEYER, Dallas, W. ,  NAGARAJAN, Subrahmanyan

Inventor： SEAGATE TECHNOLOGY, INC.

IPC: G11B05/596

CPC classification number: G11B5/012 ,  G11B5/5565 ,  G11B5/59627 ,  G11B2005/0021

Abstract: A magnetic disc drive has a magnetoresistive element (26) for reading user data from concentric tracks of a rotatable magnetic recording disc (32). The magnetoresistive element has a resistance based on a magnetic field derived from user data and based on temperature of the magnetoresistive element. Heat generated by the bias current through the head is in part dissipated through the disc, the amount of heat dissipated being representative of disc/head spacing. The surface of the recording disc has contour elements (50, 52, 54) arranged in a pattern representing servo data, the contour elements having a height such that the spacing between the magnetoresistive element and the contour elements is different from the spacing between the magnetoresistive element and a nominal surface of the recording disc. As a result, a modulated signal (66) from the head contains a component representative of user data and a component representative of servo data.

Abstract translation: 磁盘驱动系统包括读取旋转磁记录盘（32）的同心磁道上的用户数据的磁阻元件（26）。 磁阻元件具有基于从用户数据导出的磁场和所述元件的温度的电阻。 由流经磁头的偏置电流产生的热量部分地被磁盘消散，散热量代表磁盘/磁头间隙。 记录盘的表面具有以代表伺服数据的图案布置的轮廓元件（50,52,54），并具有这样的高度，使得将它们与磁阻元件分开的距离不同于距离 在磁阻元件和记录盘的标称表面之间。 因此，由头部发出的调制信号（66）包含用户数据的代表性分量和伺服数据的代表性分量。

公开(公告)号：WO1996011470A1

公开(公告)日：1996-04-18

申请号：PCT/US1995011252

申请日：1995-09-08

Applicant: QUANTUM CORPORATION

Inventor： QUANTUM CORPORATION ,  FISHER, Kevin, D. ,  FITZPATRICK, Jim ,  CHE, Xiadong

IPC: G11B05/596

CPC classification number: G11B5/59655

Abstract: Synchronous detection of fine position servo information within a partial response maximum likelihood (PRML) data channel. Servo information (17) is recorded as a pair or series of fractional-track-width sinewave concurrent burst patterns producing an on-track phase generating a position error signal varying linearly about track centerline and at least one off-track phase generating a position error signal related to track boundary. Head (26) generates on-track phase and off-track phase analog signals that are gain normalized (40) and synchronously quantized (46). Mulfiplying by a normalization factor from a correlation signal generator (64) during servo sampling intervals provides normalized samples, integrating (66) on-track phase normalized samples provides on-track position error signal (82), and integrating (66) off-track phase normalized samples provides an off-track position error signal (88). A discrete matched filter is also used.

Abstract translation: 在部分响应最大似然（PRML）数据通道内同步检测精细位置伺服信息。 伺服信息（17）被记录为一对或一系列分数轨道宽度正弦波同时脉冲串模式，产生轨道上相位，产生一个轨道中心线线性变化的位置误差信号，以及产生位置误差的至少一个偏离轨道相位 与轨道边界相关的信号。 磁头（26）产生增益归一化（40）并同步量化的轨道相位和偏离轨相位模拟信号（46）。 在伺服采样间隔期间来自相关信号发生器（64）的归一化因子的摩擦提供归一化采样，积分（66）轨道相位归一化样本提供轨道位置误差信号（82），并且积分（66）偏离轨迹 相位归一化样本提供偏离位置误差信号（88）。 还使用离散匹配滤波器。

公开(公告)号：WO1995034066A1

公开(公告)日：1995-12-14

申请号：PCT/US1995007257

申请日：1995-06-06

Applicant: MAXTOR CORPORATION

Inventor： MAXTOR CORPORATION ,  BRUNER, Curt ,  REH, Jeff ,  HUTSELL, Larry ,  ALBERT, Glenn

IPC: G11B05/596

CPC classification number: G11B27/36 ,  G11B5/5534 ,  G11B5/5547 ,  G11B19/00 ,  G11B19/02 ,  G11B19/12 ,  G11B2220/20

Abstract: A hard disk drive which has a plurality of calibration parameters stored on the disk of the drive. Calibration values for null current, jam, head width, and bandwidth are stored on the disk surface (114) and accessed during spin-up. The values are precalculated in the factory while testing the disk (100, 102, 104, 106, 108) and then computing a calibration value (112).

Abstract translation: 具有存储在驱动器的盘上的多个校准参数的硬盘驱动器。 零电流，卡纸，磁头宽度和带宽的校准值存储在磁盘表面（114）上，并在启动期间访问。 在测试磁盘（100,102,104,106,108），然后计算校准值（112）时，工厂中的值被预先计算。

公开(公告)号：WO1995005659A1

公开(公告)日：1995-02-23

申请号：PCT/US1994009260

申请日：1994-08-16

Applicant: TRACE MOUNTAIN PRODUCTS, INC.

Inventor： TRACE MOUNTAIN PRODUCTS, INC. ,  McDONNELL, Kevin ,  DICKERSON, James, S.

IPC: G11B05/596

CPC classification number: G11B5/5534

Abstract: In a magnetic or optical disk duplication or recording system (10) with a disk drive and a recording head (20) axial mis-alignment ("mis-chucking") of a disk installed to rotate about a disk drive axis is detected. A digital data signal is written by the recording head to tracks on the rotating disk (24), the head being positioned initially at a certain track position. The duration between when the recording head (20) detects an index provided on the rotating disk and when the recording head (20) detects a mark thereon is determined. Preferably after the disk is removed and reinserted in the same disk drive, the recording head (20) is then re-positioned at the initial track position, such that another digital data signal may be read at the initial track position. Another duration is determined, between when the recording head detects the index and the mark on disk. Disk chucking failure is detected when the durations, as well as the digital data signals, are substantially different.

Abstract translation: 在具有磁盘驱动器和记录头（20）的磁盘或光盘复制或记录系统（10）中，检测安装为围绕磁盘驱动器轴线旋转的盘的轴向错位（“夹紧”）。 数字数据信号由记录头写入旋转盘（24）上的轨道，头部最初定位在某个轨迹位置。 记录头（20）检测到设置在旋转盘上的索引与记录头（20）在其上检测到标记之间的持续时间被确定。 优选地，在盘被移除并重新插入到同一盘驱动器中之后，记录头（20）然后被重新定位在初始轨迹位置，使得可以在初始轨迹位置读取另一数字数据信号。 在记录头检测到索引和磁盘上的标记之间时，确定另一个持续时间。 当持续时间以及数字数据信号显着不同时，检测到磁盘卡盘故障。

公开(公告)号：WO1994012976A1

公开(公告)日：1994-06-09

申请号：PCT/US1993010918

申请日：1993-11-10

Applicant: MAXTOR CORPORATION

Inventor： MAXTOR CORPORATION ,  MAYO, Mike, J.

IPC: G11B05/596

CPC classification number: G11B5/5547

Abstract: A disk storage system having a mechanism for minimizing effects of slip/stick in a disk drive head assembly. A transducer is used to read data from and write data to a rotating disk. An actuator assembly is comprised of a load member onto which a flexure is attached. A slider is mounted onto the flexure. In this manner, the transducer can pitch and roll to maintain a constant height in reference to the disk's surface. A servo mechanism controls the acceleration and deceleration of the head according to a predetermined seek profile (602) specifying how the transducer is moved for a particular seek. As the transducer approaches the destination track, the profile (602) calls for a sudden deceleration surge (603) in order to compensate for misalignments ocurring during the seek due to the flexure slipping laterally in reference to the load member and sticking in that position because of friction.

Abstract translation: 一种磁盘存储系统，具有用于最小化磁盘驱动器头组件中滑动/粘滞的影响的机构。 传感器用于从旋转盘读取数据并将数据写入旋转盘。 致动器组件包括其上附接有挠曲件的负载构件。 滑块安装在挠曲件上。 以这种方式，传感器可以俯仰和滚动以相对于盘的表面保持恒定的高度。 伺服机构根据预定的寻道轮廓（602）来控制头部的加速和减速，其中规定了换能器如何为特定寻道而移动。 当传感器接近目的地轨道时，轮廓（602）需要突然的减速冲击（603），以便补偿由于在相对于负载构件横向滑动并且粘在该位置上的挠曲在寻道期间产生的不对准，因为 的摩擦。

公开(公告)号：WO1994011864A1

公开(公告)日：1994-05-26

申请号：PCT/US1993010839

申请日：1993-11-10

Applicant: HARDISK TECHNOLOGY

Inventor： HARDISK TECHNOLOGY ,  CRIBBS, Daniel, F. ,  ELLENBERGER, Michael, L. ,  HASSLER, John, Wade, Jr.

IPC: G11B05/596

CPC classification number: G11B5/59633

Abstract: The present disclosure relates to a disk drive (10) comprising a rotating disk (12) with a recording surface (14), a transducer (16) in communication with the surface and swept radially over the surface by a servo-actuator (18), a variable gain read amplifier (20) connected to the transducer, an analog-to-digital convertor ADC (22) attached to the variable gain amplifier, an erase frequency oscillator (24) coupled to the transducer for erasing of the disk surface, a memory (26) for storing digital outputs appearing at the ADC, and a controller for signalling the servo-actuator (30) to move to such radial positions that result in transducer read amplitudes that are a percentage of previous read amplitudes represented in the digital memory. Bit-synchronism between tracks is maintained by writing an initial clock track with closure and then writing a next clock track including a regular sequence of clock bursts a half-track space offset such that the initial clock track can be read in between writing clock bursts and the read signal is used to frequency-lock an oscillator (29) which is used as a reference for the writing of clock bursts of the next track. A checkerboard pattern of clock bursts is thus created.

Abstract translation: 本发明涉及包括具有记录表面（14）的旋转盘（12）的磁盘驱动器（10），与表面连通并通过伺服致动器（18）在表面上径向掠过的换能器（16） ，连接到所述换能器的可变增益读取放大器（20），连接到所述可变增益放大器的模数转换器ADC（22），耦合到所述换能器以擦除所述盘表面的擦除频率振荡器（24） 用于存储出现在ADC处的数字输出的存储器（26）以及用于发信号通知伺服致动器（30）移动到这样的径向位置的控制器，该径向位置导致换能器读数幅度是数字中表示的先前读取幅度的百分比 记忆。 通过写入具有闭合的初始时钟轨道来保持轨道之间的位同步，然后写下一个包括时钟脉冲串的规则序列的下一个时钟轨迹，半时隙空间偏移，使得初始时钟轨迹可以在写时钟脉冲串和 该读取信号用于频率锁定振荡器（29），该振荡器用作下一个磁道的时钟脉冲串的写入的参考。 因此创建了时钟突发的棋盘图案。

公开(公告)号：WO1991006096A1

公开(公告)日：1991-05-02

申请号：PCT/US1990004762

申请日：1990-08-22

Applicant: CONNER PERIPHERALS, INC.

Inventor： CONNER PERIPHERALS, INC. ,  SQUIRES, John, P.

IPC: G11B05/596

CPC classification number: G11B5/59622 ,  G11B21/106 ,  Y10S360/901 ,  Y10S360/903

Abstract: The disk drive system (10) includes an actuator (16), responsive to an adjacent value, for adjusting the position of a data head (20) with respect to data tracks (22) located on the surface of a disk (12), and a controller (24) coupled to the data head (20) and to the actuator (16). The controller (24) receives servo information read from the surface of the disk (12) by the data head (20). In turn, the controller (24) determines an adjustment value to be applied to the actuator (16). The adjustment value is calculated dependent on a predetermined variable gain factor. Where the controller (24) determines the position of the head (20) is oscillating about the center line of a predetermined data track at a frequency above a predetermined frequency, the controller (24) reduces the gain factor applied in determining the adjustment value.

公开(公告)号：WO1987003412A1

公开(公告)日：1987-06-04

申请号：PCT/US1986001986

申请日：1986-09-25

Applicant: XEBEC DEVELOPMENT PARTNERS, LTD.

Inventor： XEBEC DEVELOPMENT PARTNERS, LTD. ,  BLESSUM, Norman, S.

IPC: G11B05/596

CPC classification number: G11B5/59688

Abstract: A disc drive control system including servo sectors (S1, S2...) written on a disk, (13) with each sector containing three sets of marker pulses (P1, P2, P3) arranged to that three adjacent marker pulses from each of the sets spans two tracks (G1). The pulses each comprise high frequency sinusoidal signals. Servo control depends upon the pulse amplitudes sensed by the read/write head while traversing a servo sector.

Abstract translation: 一种磁盘驱动器控制系统，包括写在盘上的伺服扇区（S1，S2 ...），（13），每个扇区包含三组标记脉冲（P1，P2，P3） 集合跨越两个轨道（G1）。 脉冲各自包括高频正弦信号。 伺服控制取决于读/写头在扫描伺服扇区时检测到的脉冲幅度。