公开(公告)号：US5870242A

公开(公告)日：1999-02-09

申请号：US715046

申请日：1996-09-17

申请人： Yukio Abe ,  Koji Ikenoya ,  Takehiko Tsuboi

发明人： Yukio Abe ,  Koji Ikenoya ,  Takehiko Tsuboi

IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC分类号： G11B21/106 ,  G11B21/085 ,  G11B5/553 ,  G11B5/5534 ,  G11B5/5582 ,  G11B5/59611 ,  G11B5/59688

摘要： Servo information is written on a magnetic disk at intervals equivalent to 1/N of where the period at the position of a head is controlled. When the frequency characteristic of a servo loop is measured, a servo controller generates a position signal, which indicates deviation of the head from a reference position, using servo information at a first sampling point, calculates an actuator drive current command value, which drives an actuator, on the basis of the position signal, and controls the actuator based upon the current command value. Further, the servo controller executes processing for generating the position signal, but does not calculate the actuator drive current command value, on the basis of servo information at second through Nth sampling points. A frequency characteristic analyzer inserts a disturbance signal having a predetermined frequency into the servo loop, accepts, at double the sampling frequency, the position signal and the actuator drive current generated based upon each item of servo information, obtains the frequency characteristic of the servo loop and outputs the frequency characteristic.

摘要翻译： 伺服信息以等于头部位置的周期被控制的1 / N的间隔写入磁盘。 当测量伺服环路的频率特性时，伺服控制器利用第一采样点的伺服信息产生位置信号，该位置信号指示磁头与基准位置的偏差，计算驱动器的驱动电流指令值 执行器，基于位置信号，并且基于当前命令值来控制致动器。 此外，伺服控制器基于第二至第N采样点的伺服信息执行用于产生位置信号但不计算致动器驱动电流指令值的处理。 频率特性分析器将具有预定频率的干扰信号插入到伺服回路中，以采样频率的两倍接收基于每个伺服信息产生的位置信号和致动器驱动电流，获得伺服环路的频率特性 并输出频率特性。

公开(公告)号：US6043945A

公开(公告)日：2000-03-28

申请号：US935520

申请日：1997-09-23

申请人： Takehiko Tsuboi ,  Koji Ikenoya ,  Tomoo Furukawa ,  Toshihiko Matsuda ,  Koji Ishii ,  Hiroyuki Kobayashi ,  Yukio Abe

发明人： Takehiko Tsuboi ,  Koji Ikenoya ,  Tomoo Furukawa ,  Toshihiko Matsuda ,  Koji Ishii ,  Hiroyuki Kobayashi ,  Yukio Abe

IPC分类号： G11B20/12 ,  G11B20/18 ,  G11D5/09 ,  G06F11/00 ,  G11C29/00

CPC分类号： G11B20/1816 ,  G11B20/1883 ,  G11B2220/20

摘要： A device for recording and reproducing data on a recording media includes an error detecting unit for detecting a defective sector by reading the data from the media, a data copying unit for copying the data of the defective sector to at least one temporary replacing sector, a test unit for testing whether the defective sector has a media defect, and a replacement unit for replacing the defective sector with a spare sector by copying the data of the at least one temporary replacing sector to the spare sector when the defective sector has the media defect.

摘要翻译： 用于在记录介质上记录和再现数据的设备包括：错误检测单元，用于通过从媒体读取数据来检测缺陷扇区;数据复制单元，用于将缺陷扇区的数据复制到至少一个临时替换扇区; 测试单元，用于测试缺陷扇区是否具有介质缺陷;以及替换单元，用于当缺陷扇区具有介质缺陷时，通过将至少一个临时替换扇区的数据复制到备用扇区来替换缺陷扇区 。

公开(公告)号：US6078454A

公开(公告)日：2000-06-20

申请号：US573319

申请日：1995-12-15

申请人： Tsuyoshi Takahashi ,  Toshihiko Matsuda ,  Takehiko Tsuboi ,  Koji Ikenoya ,  Yukio Abe ,  Koji Ishii ,  Tomoo Furukawa ,  Hiroyuki Kobayashi

发明人： Tsuyoshi Takahashi ,  Toshihiko Matsuda ,  Takehiko Tsuboi ,  Koji Ikenoya ,  Yukio Abe ,  Koji Ishii ,  Tomoo Furukawa ,  Hiroyuki Kobayashi

IPC分类号： G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/03 ,  G11B5/39 ,  G11B5/48 ,  G11B5/56 ,  G11B5/596 ,  G11B21/10 ,  G11B33/14

CPC分类号： G11B5/012 ,  G11B21/106 ,  G11B5/56 ,  G11B2005/0018 ,  G11B33/14 ,  G11B5/4886

摘要： When a combination head is on-tracked to an arbitrary cylinder position, a head position controller corrects a head position so as to eliminate an offset amount derived from an offset table. A bias current setting circuit obtains a current set value corresponding to an offset correction amount from a bias current table and supplies the bias current according to the current set value to an MR head. As kinds of offsets, there are a yaw angle offset, a thermal offset, and a core deviation offset.

摘要翻译： 当组合磁头跟踪到任意气缸位置时，磁头位置控制器校正磁头位置，以消除从偏移表导出的偏移量。 偏置电流设定电路从偏置电流表获得与偏移校正量对应的电流设定值，并根据当前设定值将偏置电流提供给MR磁头。 作为偏移类型，存在偏航角偏移，热偏移和磁心偏移偏移。