公开(公告)号：US5168398A

公开(公告)日：1992-12-01

申请号：US557082

申请日：1990-07-25

申请人： Hiroyuki Kanda ,  Yasumasa Kawai

发明人： Hiroyuki Kanda ,  Yasumasa Kawai

IPC分类号： G11B21/10 ,  G11B5/596

CPC分类号： G11B5/59627

摘要： In a servo system for a hard disk drive, an integrating circuit for eliminating an offset of a head has its capacitor charged to an extent corresponding to an offset amount, at a time of a track following control operation, before an integral action is done. The integrating circuit performs the integral action through the utilization of the charged capacity to eliminate the offset amount of the head. A CPU retrieves an initially prepared offset table for one of voltage level data corresponding to the offset amount which is determined in accordance with a head's destination track. A D/A converter converts the voltage level data which comes from CPU to a voltage and supplies it to the capacitor in the integrating circuit.

摘要翻译： 在用于硬盘驱动器的伺服系统中，用于消除头部的偏移的积分电路在完成积分动作之前，在跟踪控制操作时，将电容器充电到与偏移量相对应的程度。 积分电路通过利用充电容量来执行积分动作以消除头部的偏移量。 CPU根据头的目的地轨道确定与偏移量相对应的电压电平数据之一，检索最初准备的偏移表。 D / A转换器将来自CPU的电压电平数据转换为电压，并将其提供给积分电路中的电容器。

公开(公告)号：US5898535A

公开(公告)日：1999-04-27

申请号：US720182

申请日：1996-09-25

申请人： Yasumasa Kawai

发明人： Yasumasa Kawai

IPC分类号： G11B5/39 ,  G11B5/02 ,  G11B5/596 ,  G11B20/00

CPC分类号： G11B5/59605

摘要： A read/write circuit detects the occurrence of a thermal asperity in accordance with data read from a disk. Thermal asperity status register sets a flag corresponding to thermal asperity occurrence spot in a servo area. A write/read fault generator outputs no WRF signals if the corresponding flag of the thermal asperity status register is set even when error detection is notified from an address error register, and thereby enables a sequencer to continue its recording and reproducing operation.

摘要翻译： 读/写电路根据从盘读取的数据检测出热绝缘的发生。 散热状态寄存器设置与伺服区域中的热凹凸发生点对应的标志。 如果即使从地址错误寄存器通知了错误检测，即使设置了热凹凸状态寄存器的相应标志，写入/读取故障发生器也不输出WRF信号，从而使定序器能够继续其记录和再现操作。

公开(公告)号：US5748401A

公开(公告)日：1998-05-05

申请号：US529870

申请日：1995-09-18

申请人： Yasumasa Kawai

发明人： Yasumasa Kawai

IPC分类号： G11B20/12 ,  G11B5/596 ,  G11B21/08 ,  G11B27/10

CPC分类号： G11B5/59633

摘要： A table containing a servo sector number of the servo sector which includes the data sector, and the ordinal of the data sector at which the data sector is disposed in the servo sector is used to locate a data sector. A control firmware is used to obtain, from the table, the servo sector number of the servo sector including a target data sector and the target data sector number indicating the ordinal at which the target data sector is disposed in the target data sector. The parameters are respectively set in the target servo data sector number register and the target data sector number register. The servo sector number read from servo information previously recorded on the disk is set in the detected servo sector number register. The target servo sector number is compared with the detected servo sector number. If these numbers are equal to each other, the counter is enabled and counts up data sector pulses. When the counter value becomes equal to the target data sector number register value, it is determined that the target data sector is detected, and the sequencer is started, to execute reading/writing.

摘要翻译： 包含包含数据扇区的伺服扇区的伺服扇区号以及在伺服扇区中设置数据扇区的数据扇区的顺序的表用于定位数据扇区。 使用控制固件从表中获取包括目标数据扇区的伺服扇区的伺服扇区号，以及指示目标数据扇区在目标数据扇区中设置的序数的目标数据扇区号。 参数分别设置在目标伺服数据扇区号寄存器和目标数据扇区号寄存器中。 在检测到的伺服扇区号寄存器中设置从先前记录在盘上的伺服信息读取的伺服扇区号。 将目标伺服扇区号与检测到的伺服扇区号进行比较。 如果这些数字彼此相等，则计数器被使能并对数据扇区脉冲进行计数。 当计数器值等于目标数据扇区号寄存器值时，确定检测到目标数据扇区并且启动定序器以执行读/写。