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    Magnetic recording device, magnetic recording medium, and servo information recording method
    92.
    发明公开
    Magnetic recording device, magnetic recording medium, and servo information recording method 审中-公开
    Magnetische Aufzeichnungsvorrichtung，磁铁Aufzeichnungsmedium und Servo-Informationsaufzeichnungsverfahren

    公开(公告)号：EP1840886A1

    公开(公告)日：2007-10-03

    申请号：EP07005372.3

    申请日：2007-03-15

    Applicant: KABUSHIKI KAISHA TOSHIBA

    Inventor： Nakamura, Hiroaki Toshiba Corporation

    IPC: G11B5/855

    CPC classification number: G11B5/855 ,  G11B5/59655 ,  G11B5/59683

    Abstract: A magnetic recording device includes a composite magnetic head, which includes a recording head (501) and a reproduction head (502), and a magnetic recording medium. The magnetic recording medium includes a data region (101) for recording data using the recording head (501), a mask pattern region (102) in which an area in which servo information can be magnetically recorded and an area in which information cannot be magnetically recorded are formed in a predetermined pattern, and an initial positioning region (106) in which a magnetic area and a nonmagnetic area that record information for positioning one of the recording head (501) and the reproduction head (502) in the mask pattern region (102).

    Abstract translation: 磁记录装置包括复合磁头，其包括记录头（501）和再现头（502）以及磁记录介质。 磁记录介质包括用于使用记录头（501）记录数据的数据区（101），其中可以磁记录伺服信息的区域和信息不能磁性的区域的掩模图案区（102） 记录的记录头形成为预定图案，以及初始定位区域（106），其中记录用于将记录头（501）和再现头（502）中的一个定位在掩模图案区域中的信息的磁区域和非磁性区域 （102）。

    READ/WRITE HEAD AND MAGNETIC RECORDING DEVICE
    93.
    发明公开
    READ/WRITE HEAD AND MAGNETIC RECORDING DEVICE 审中-公开
    LESE- SCHREIBKOPF UND MAGNETAUFZEICHNUNGSVORRICHTUNG

    公开(公告)号：EP1202254A4

    公开(公告)日：2005-06-08

    申请号：EP00946403

    申请日：2000-07-19

    Applicant: HITACHI MAXELL

    Inventor： WAKABAYASHI KOUICHIROU ,  TAKEUCHI TERUAKI ,  INABA NOBUYUKI

    IPC: G11B5/00 ,  G11B5/012 ,  G11B5/127 ,  G11B5/31 ,  G11B5/39 ,  G11B5/48 ,  G11B5/596 ,  G11B13/04 ,  G11B5/02 ,  G11B11/10 ,  G11B11/105

    CPC classification number: G11B5/127 ,  G11B5/00 ,  G11B5/012 ,  G11B5/3103 ,  G11B5/3967 ,  G11B5/4886 ,  G11B5/596 ,  G11B5/59627 ,  G11B5/59655 ,  G11B5/59683 ,  G11B13/045 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

    Abstract: A magnetic recorder includes a laser source (132), a magnetic write head (131), and a magnetoresistive device placed between a pair of magnetic poles (100, 101) of the magnetic head. A rotary actuator (Sa) positions the magnetic write head to a desired track on a magnetic medium. The magnetic medium is irradiated with a laser beam to heat an area as wide as the track so that the coercive force of the heated area may decrease where a recording field is applied for high-density recording. An angle of yaw (υ) of the rotary actuator relative to the track will not hinder the magnetic write head (131) and the read device from following data tracks. The size of the magnetic poles (100, 101) of the magnetic write head is determined within a predetermined range to keep the laser-heated area (302) within a region (303) where a magnetic recording field is applied.

    Abstract translation: 磁记录装置包括激光源（132），记录磁头（131）和磁阻元件。 记录磁头包括一对磁极（100和101），其间插有磁阻元件。 旋转致动器（Sa）将记录磁头定位在磁记录介质的期望轨道处。 可以将激光束照射到磁记录介质上以升高介质的区域（302）的温度。 该区域具有轨道宽度顺序的宽度。 升高的温度降低了该区域的矫顽力，其中可以应用记录磁场用于高密度记录。 旋转致动器可以与磁记录介质的轨道形成偏转角（＆amp;θ）。 即使在这种情况下，记录磁头（131）和再现元件也没有跟踪轨迹的跟踪偏移。 此外，如果记录磁头的磁极（100和101）的尺寸设定在预定范围内，则由激光束加热的区域（302）不会偏离记录磁场施加区域（303） 。

    Method and apparatus to detect and manage servo sectors with defects on servo pattern area in hard disk drives
    94.
    发明公开
    Method and apparatus to detect and manage servo sectors with defects on servo pattern area in hard disk drives 有权
    用于检测和盘的伺服图案区域与缺陷处理伺服扇区的方法和设备

    公开(公告)号：EP1189222A3

    公开(公告)日：2003-06-11

    申请号：EP01122138.9

    申请日：2001-09-14

    Applicant: SAMSUNG ELECTRONICS CO., LTD.

    Inventor： Chu, Sang-Hoon ,  Shim, Jun-Seok ,  Yu, Seong-Hwan ,  Choi, Soo-Il

    IPC: G11B20/18 ,  G11B5/596 ,  G11B27/36

    CPC classification number: G11B20/1883 ,  G11B5/59655 ,  G11B20/18 ,  G11B27/3027 ,  G11B27/36 ,  G11B2020/183 ,  G11B2220/20

    Abstract: An apparatus, method and computer program product for a hard disk drive (10) defect detection system. In one embodiment, a method of detecting defects on the surface of a disk (12) having a plurality of tracks (t n ) is recited. The method comprises reading, one or more times, the servo bits for a plurality of sectors (i) and determining a burst measure for at least one sector, where the burst measure is a function of the burst signals for the sector. This method further comprises determining a reference value, where the reference value is a function of the burst signals of the plurality of sectors, and comparing the burst measure of at least one sector to the reference value to identify a potential defect. In one embodiment, a sector is mapped as defective where its burst measure differs from the reference value by at least 5 percent.

    Abstract translation: 用于硬盘驱动器的装置，方法和计算机程序产品（10）的缺陷检测系统。在一个实施方案中，具有轨道（TN）的多个盘（12）的表面上检测缺陷的方法列举。 该方法包括读取，一次或多次，所述伺服位为扇区（i）多个与确定性采矿突发度量的至少一个扇区，其中所述突发的措施是为界的脉冲串信号的功能。 该方法还包括确定开采的基准值，其中，所述参考值是扇区的多个突发信号的一个功能，并且至少一个扇区的突发测量与基准值来识别一个潜在的缺陷。 在一个其中其突发测量从基准值由至少实施方式5的不同百分比的扇区被映射为有缺陷的。

    Circuit and method for demodulating a servo position burst
    95.
    发明公开
    Circuit and method for demodulating a servo position burst 审中-公开
    Schaltung und Verfahren zur Demodulation eines Servopositions-Burtssignales

    公开(公告)号：EP1271480A2

    公开(公告)日：2003-01-02

    申请号：EP02253885.4

    申请日：2002-05-31

    Applicant: STMicroelectronics, Inc.

    Inventor： Heydari, Fereidoon ,  Ozdemir, Hakan

    IPC: G11B5/596

    CPC classification number: G11B5/59655 ,  G11B5/59688

    Abstract: A new technique for Hard Disk Drive (HDD) servo-burst demodulation is provided. A 4-samples per dibit Discrete Fourier Transform (DFT) amplitude estimation is used to calculate the read-head servo-position error signal. Comparatively, the conventional method of burst demodulation ― called burst integration ― typically uses more than 8 samples/dibit. Consequently, the new 4-samples/dibit DFT burst-demodulation scheme requires fewer samples per dibit than does burst integration, thus reducing the disk space occupied by the burst data while increasing the performance as compared to burst integration. Furthermore, the DFT scheme does not require the samples to be synchronized to any particular points of the servo burst, and can include an averaging algorithm that further improves performance for a given Signal to Noise Ratio (SNR). Moreover, the same sample-clocking circuit that detects the Gray Code servo information can also implement the DFT burst-demodulation scheme to demodulate the servo burst.

    Abstract translation: 提供了一种用于硬盘驱动器（HDD）伺服突发解调的新技术。 使用4个样本每个双向离散傅里叶变换（DFT）幅度估计来计算读取头伺服位置误差信号。 相比之下，传统的突发解调方法称为突发集成，通常使用超过8个样本/双位。 因此，新的4采样/双位DFT突发解调方案比突发集成需要比每比特少的采样，因此与突发集成相比，降低了突发数据占用的磁盘空间，同时提高了性能。 此外，DFT方案不要求样本与伺服脉冲串的任何特定点同步，并且可以包括进一步改善给定信噪比（SNR）的性能的平均算法。 此外，检测格雷码伺服信息的同一采样时钟电路还可以实现DFT突发解调方案来解调伺服脉冲串。

    Burst position error data write method and magnetic disk unit
    96.
    发明公开
    Burst position error data write method and magnetic disk unit 有权
    SchreibverfahrenfürBurstfehler der Positionsdaten undZugehörigesMagnetplattenlaufwerkfürdieses

    公开(公告)号：EP1271476A2

    公开(公告)日：2003-01-02

    申请号：EP01308470.2

    申请日：2001-10-03

    Applicant: FUJITSU LIMITED

    Inventor： Hirano, Masakazu, c/o Fujitsu Limited ,  Suzuki, Nobuyuki, c/o Fujitsu Limited

    IPC: G11B5/596

    CPC classification number: G11B5/59655

    Abstract: A magnetic disk unit writes, on a magnetic disk, a burst position error data which is used for correcting a positional error of a burst pattern which is used for correcting an error within one track, next to the burst pattern. A write head is controlled a position so as to satisfy a relationship M = N when (N-1)K

    Abstract translation: 磁盘单元在磁盘上写入脉冲串位置误差数据，该脉冲串位置误差数据用于校正突发模式的位置误差，脉冲串模式用于在突发模式旁边的一个磁道内校正误差。 当（N-1）K

    SYNCHRONOUS DETECTION OF CONCURRENT SERVO BURSTS FOR FINE HEAD POSITION IN DISK DRIVE
    97.
    发明授权
    SYNCHRONOUS DETECTION OF CONCURRENT SERVO BURSTS FOR FINE HEAD POSITION IN DISK DRIVE 失效
    竞争力的同步检测阵阵对头精确定位磁盘驱动器

    公开(公告)号：EP0786133B1

    公开(公告)日：2001-12-19

    申请号：EP95932403.9

    申请日：1995-09-08

    Applicant: QUANTUM CORPORATION

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

    IPC: G11B5/596

    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.

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