公开(公告)号：US06175459B1

公开(公告)日：2001-01-16

申请号：US09123749

申请日：1998-07-27

申请人： Isamu Tomita

发明人： Isamu Tomita

IPC分类号： G11B509

CPC分类号： G11B5/012 ,  G11B33/10

摘要： A magnetic disk drive capable of specifying even the type of a medium defect with a small number of read/write operations is disclosed. A read signal is sampled. A defect detector 40 of a read channel IC includes a (1+D) calculation circuit 41 for adding the current and preceding sample values or the absolute values thereof. The two types of sums of the current and preceding samples are compared with a lower reference value and an upper reference value preset in comparators 42, 43, respectively. A portion where the sum of the sample values exceeds the upper reference value is detected as a medium defect due to thermal asperity, a portion where the sum of the absolute values of the sample values is lower than the lower reference value is detected as a medium defect due to a missing, signal and a portion where the sum of the absolute values of the sample values exceeds the upper reference value as a medium effect due to an extra, signal thereby generating a defect detection signal DD. Three types of defects can thus be detected with a single read operation.

摘要翻译： 公开了能够以少量的读/写操作来指定均匀的介质缺陷的类型的磁盘驱动器。 读取信号被采样。 读通道IC的缺陷检测器40包括用于将当前和之前的采样值或其绝对值相加的（1 + D）计算电路41。 将当前样本和先前样本的两种类型的和值分别与比较器42,43中预设的较低参考值和较高参考值进行比较。 将样本值的总和超过上限值的部分作为中间缺陷被检测为由于热不平坦而引起的，将样本值的绝对值之和低于下部基准值的部分检测为介质 由于缺少，信号和由于额外的信号引起的样本值的绝对值的总和超过上限参考值的部分的缺陷，从而产生缺陷检测信号DD。 因此，可以通过单次读取操作来检测三种类型的缺陷。

公开(公告)号：US6130793A

公开(公告)日：2000-10-10

申请号：US822426

申请日：1997-03-21

申请人： Hideki Ohmori ,  Masahide Kanegae ,  Isamu Tomita

发明人： Hideki Ohmori ,  Masahide Kanegae ,  Isamu Tomita

IPC分类号： G11B5/39 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/48 ,  G11B19/04 ,  G11B20/18 ,  G11B27/36 ,  G11B33/14

CPC分类号： G11B5/09 ,  G11B19/04 ,  G11B27/36 ,  G11B5/012 ,  G11B2005/0016 ,  G11B2220/20 ,  G11B33/14 ,  G11B5/4886

摘要： A thermal asperity detection method includes the steps of (a) converting an analog signal reproduced from a magnetic recording medium into a digital signal using an analog-to-digital converter, (b) detecting thermal asperity based on the digital signal, and (c) automatically recognizing and managing detection of the thermal asperity by the step (b) by firmware.

摘要翻译： 热凹凸检测方法包括以下步骤：（a）使用模数转换器将从磁记录介质再现的模拟信号转换为数字信号，（b）基于数字信号检测热不均匀性，和（c ）通过固件自动识别和管理步骤（b）的热不均匀检测。

公开(公告)号：US5907449A

公开(公告)日：1999-05-25

申请号：US823083

申请日：1997-03-24

申请人： Kenji Itou ,  Isamu Tomita ,  Nobuyuki Suzuki

发明人： Kenji Itou ,  Isamu Tomita ,  Nobuyuki Suzuki

IPC分类号： G11B21/10 ,  G11B5/596

CPC分类号： G11B5/59605

摘要： A position sensitivity adjusting method for a disk apparatus and a disk apparatus using the same for adjusting an AGC (Automatic Gain Control) amplifier for amplifying a servo signal on a servo surface of a disk medium, involves positioning a servo head at a boundary of tracks on the servo surface. The method then includes setting a plurality of different adjustment values in the AGC amplifier, reading two position signals through the servo head for each adjustment value, and calculating a dispersion value of the position signals for each adjustment value. After the adjustment value for the AGC amplifier which provides the minimum dispersion value is acquired from the calculated dispersion values, the acquired adjustment value is set in the AGC amplifier. With the adjusting method, even when offset compensation for positioning the servo head at a track boundary is executed, a positioning error can be prevented.

摘要翻译： 一种盘装置的位置灵敏度调整方法和使用该装置的盘装置，用于调整用于放大盘介质的伺服表面上的伺服信号的AGC（自动增益控制）放大器，包括将伺服头定位在轨道的边界处 在伺服面上。 然后，该方法包括在AGC放大器中设置多个不同的调整值，对于每个调整值读取通过伺服头的两个位置信号，并且计算每个调整值的位置信号的色散值。 在从所计算的色散值获取提供最小色散值的AGC放大器的调整值之后，将所获取的调整值设置在AGC放大器中。 通过调整方法，即使执行用于将伺服头定位在轨道边界的偏移补偿，也可以防止定位误差。

公开(公告)号：US20090290253A1

公开(公告)日：2009-11-26

申请号：US12360627

申请日：2009-01-27

申请人： Isamu Tomita

发明人： Isamu Tomita

IPC分类号： G11B5/596

CPC分类号： G11B5/59644 ,  G11B20/10009 ,  G11B20/10361 ,  G11B20/10388 ,  G11B20/1217 ,  G11B2020/10916 ,  G11B2020/1232 ,  G11B2020/1281 ,  G11B2020/183 ,  G11B2220/2516

摘要： A operation of storing a post code, which is read from each servo frame on a target track of a disk recording medium, in a memory if an on-track condition for determining that a head is controlled to be positioned on the target track is satisfied is executed. Next, a operation of using the post code, which is stored in the memory, for a correction of a demodulation position if the post code corresponding to each servo frame is stored in the memory and the on-track condition is satisfied in the correction of the demodulation position in each servo frame is executed.

摘要翻译： 如果满足用于确定头部被控制在目标轨道上的跟踪条件，则存储将从每个伺服帧读取的后代码存储在盘记录介质的目标轨道上的操作在存储器中的操作 被执行。 接下来，如果在对应于每个伺服帧的后期代码被存储在存储器中并且在轨道条件下，则存储在存储器中的用于校正解调位置的后代码的操作在校正 执行每个伺服帧中的解调位置。

公开(公告)号：US20080013204A1

公开(公告)日：2008-01-17

申请号：US11650275

申请日：2007-01-04

申请人： Tomoaki Saito ,  Isamu Tomita

发明人： Tomoaki Saito ,  Isamu Tomita

IPC分类号： G11B5/596

CPC分类号： G11B5/5547

摘要： A seek control apparatus, a seek control method and a storage apparatus can prevent degradation of performance of a read/write head due to residual oscillations in a seek operation. The seek control apparatus for performing a seek control of a head comprises an MCU 11 that acquires control information corresponding to the externally indicated data length out of the control information stored in a storage section 18 storing the control information for seek control for each of a plurality of data length ranges and performs a seek control according to the acquired control information.

摘要翻译： 搜索控制装置，搜索控制方法和存储装置可以防止由于搜索操作中的残留振荡引起的读/写头的性能的劣化。 用于执行头的搜索控制的搜索控制装置包括：MCU 11，其从存储在多个控制信息中的每个的存储部分18的存储部分18中的控制信息中获取与外部指示的数据长度相对应的控制信息 的数据长度范围，并根据获取的控制信息执行搜索控制。

公开(公告)号：US06690538B1

公开(公告)日：2004-02-10

申请号：US09661266

申请日：2000-09-13

申请人： Tomoaki Saito ,  Isamu Tomita

发明人： Tomoaki Saito ,  Isamu Tomita

IPC分类号： G11B5596

CPC分类号： G11B5/5547

摘要： A disk drive device including a plurality of disks that are arranged concentrically about a central axis, wherein each of the disks includes a plurality of concentric tracks of different diameters. Each of the disks also includes a top surface and a bottom surface. There are a plurality of cylinders defined by a combination of one of the tracks from each of the disks, wherein each cylinder consists of a plurality of tracks of a single diameter. A plurality of heads are associated with the disks, wherein each of the heads is configured and arranged to access either a top surface or a bottom surface of one of the disks. The present invention also includes an upper level device for issuing access commands directing the heads to access the disks. When an access command is issued that requires sequential data to be accessed on more than one track, an access sequence is followed in which at least two of the top surfaces on different disks of the same cylinder are accessed directly after each other, or, at least two of the bottom surfaces on different disks of the same cylinder are accessed directly after each other.

摘要翻译： 一种盘驱动装置，包括围绕中心轴线同心布置的多个盘，其中每个盘包括多个不同直径的同心轨道。 每个盘还包括顶表面和底表面。 存在由来自每个盘的轨道之一的组合限定的多个气缸，其中每个气缸由多个单个直径的轨道组成。 多个磁头与磁盘相关联，其中每个磁头被配置和布置成进入磁盘之一的顶表面或底表面。 本发明还包括一个上位装置，用于发出指令磁头访问磁盘的访问命令。 当发出要求在多于一个轨道上访问顺序数据的访问命令时，遵循访问顺序，其中相同圆柱体的不同磁盘上的至少两个顶表面彼此直接访问，或者在 相同圆柱体的不同圆盘上的至少两个底面彼此直接相接。

公开(公告)号：US06219722B1

公开(公告)日：2001-04-17

申请号：US09216844

申请日：1998-12-21

申请人： Isamu Tomita

发明人： Isamu Tomita

IPC分类号： G06F1214

CPC分类号： G11B20/10 ,  G11B5/012 ,  G11B33/121

摘要： A register address and control data which were serially transferred from an outside by a serial interface unit are received, the received head address is stored into a head address control register, and a head selection signal corresponding to the head address is outputted. When the setting of an automatic head switching mode is received from the outside, an automatic head switching control unit automatically switches the contents of the head address control register and sequentially outputs the head selection signals to a plurality of heads synchronously with a write gate signal (WRGT signal) E8 to instruct the writing operation from the outside.

摘要翻译： 接收从串行接口单元从外部串行传送的寄存器地址和控制数据，接收的头地址被存储到头地址控制寄存器中，并且输出与头地址对应的头选择信号。 当从外部接收到自动头切换模式的设置时，自动头切换控制单元自动切换头地址控制寄存器的内容，并且与写入门信号同步地顺序地将头选择信号输出到多个头 WRGT信号）E8指示来自外部的写入操作。

公开(公告)号：US6064541A

公开(公告)日：2000-05-16

申请号：US848138

申请日：1997-04-28

申请人： Tatsuro Sasamoto ,  Isamu Tomita ,  Keiji Aruga

发明人： Tatsuro Sasamoto ,  Isamu Tomita ,  Keiji Aruga

IPC分类号： G11B5/596 ,  G11B21/10

CPC分类号： G11B5/59688

摘要： Disclosed are a servo pattern writing method for magnetic disk drives making it possible to write a high-density and easily controllable servo pattern with high producibility, and a magnetic disk drive in which a servo pattern is written according to the method. The servo pattern writing method for magnetic disk drives in which a servo pattern is written on a plurality of surfaces in a magnetic disk drive having the plurality of surfaces comprises a step of writing a master servo pattern on a master surface that is one of the plurality of surfaces, and a step of writing a servo pattern on the surfaces other than the master surface while performing positioning on the basis of the master servo pattern. The master servo pattern contains a pattern identical to the servo pattern to be written on the surfaces other than the master surface. The master servo pattern is written before the master surface is incorporated in a main unit of the magnetic disk drive. Part of the master servo pattern other than the pattern identical to the servo pattern is deleted after the servo pattern is written on the surfaces other than the master surface.

摘要翻译： 公开了一种用于磁盘驱动器的伺服模式写入方法，其可以以高可生产性写入高密度且容易控制的伺服模式，以及根据该方法写入伺服模式的磁盘驱动器。 在具有多个表面的磁盘驱动器的多个表面上写入伺服图形的磁盘驱动器的伺服图案写入方法包括在主表面上写入主伺服图案的步骤，该主表面是多个 并且在基于主伺服模式执行定位的同时，在主表面以外的表面上写入伺服图案的步骤。 主伺服模式包含与要写在主表面以外的表面上的伺服模式相同的模式。 在将主表面并入磁盘驱动器的主单元之前，写入主伺服模式。 伺服模式写在主表面以外的表面上，删除与伺服模式相同的模式以外的主伺服模式的一部分。

公开(公告)号：US5805373A

公开(公告)日：1998-09-08

申请号：US422150

申请日：1995-04-14

申请人： Takeyori Hara ,  Isamu Tomita ,  Taturo Sasamoto ,  Nobuyuki Suzuki ,  Masafumi Sato

发明人： Takeyori Hara ,  Isamu Tomita ,  Taturo Sasamoto ,  Nobuyuki Suzuki ,  Masafumi Sato

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59627 ,  G11B5/59633

摘要： This invention relates to a disk drive and a method of writing data to the disk drive. In a disk drive including a write head, a read head and a positioning unit of a head which includes a write element and a read element, the present invention provides the disk drive with a position error measuring unit for measuring the amount of a position error of the write element and the read element; and a write/read control unit for obtaining an offset amount of the head in accordance with the amount of the position error of the head, setting the offset amount to the positioning unit so as to offset the head, and effecting data write/read operation. When format write operation is executed, only an ID portion is offset in the same direction as the direction of the position error so measured in accordance with the measured amount of the position error, and is written.

摘要翻译： 本发明涉及磁盘驱动器和将数据写入磁盘驱动器的方法。 在包括写入头，读取头和包括写入元件和读取元件的头部的定位单元的磁盘驱动器中，本发明为磁盘驱动器提供了一个用于测量位置误差量的位置误差测量单元 的写元件和读元件; 以及写/读控制单元，用于根据头的位置误差量获得头的偏移量，将偏移量设置到定位单元以偏移头，并且执行数据写/读操作 。 当执行格式写入操作时，仅沿着与根据测量的位置误差量测量的位置误差的方向相同的方向偏移ID部分，并被写入。

公开(公告)号：US5754354A

公开(公告)日：1998-05-19

申请号：US345583

申请日：1994-11-28

申请人： Isamu Tomita ,  Tsuyoshi Furukawa

发明人： Isamu Tomita ,  Tsuyoshi Furukawa

IPC分类号： G11B5/39 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B15/12

CPC分类号： G11B5/012 ,  G11B5/5526 ,  G11B5/59683 ,  G11B2005/0016 ,  G11B5/4886 ,  G11B5/59627 ,  G11B5/59688

摘要： A magnetic disk drive unit includes a first read amplifier connected to an inductive head, a second read amplifier connected to a magneto-resistive head, a selective output unit for selecting either an output of the first read amplifier or an output of the second read amplifier and supplying a selected output to a demodulator, and a control unit for supplying a switching control signal. When reading servo information written onto a data surface of a magnetic recording medium, the control unit controls the switching control signal and thus causes the selective output unit to select an output of the first read amplifier associated with the inductive head. By the constitution, servo information can be detected in a wide range using a relatively simple data-surface servo pattern. This realizes high-precision off-tracking compensation.

摘要翻译： 磁盘驱动单元包括连接到感应头的第一读取放大器，连接到磁阻头的第二读取放大器，用于选择第一读取放大器的输出或第二读取放大器的输出的选择性输出单元 以及将选择的输出提供给解调器，以及用于提供开关控制信号的控制单元。 当读取写入到磁记录介质的数据表面上的伺服信息时，控制单元控制切换控制信号，从而使选择输出单元选择与感应头相关的第一读出放大器的输出。 通过该结构，可以使用相对简单的数据表面伺服模式在宽范围内检测伺服信息。 这实现了高精度偏移补偿。