公开(公告)号：JPH02156467A

公开(公告)日：1990-06-15

申请号：JP30989088

申请日：1988-12-09

Applicant: IBM JAPAN

Inventor： FUKUNAGA SEIJI ,  NAKAMURA TAKASHI ,  ONO HIROYUKI

IPC: G01P3/44 ,  G01P3/489 ,  G11B19/247 ,  G11B19/28

Abstract: PURPOSE:To obtain a pulse following the rotational characteristic of a motor by eliminating the error components of a sensor and a pattern by mounting a light pattern on the shaft of the motor to rotate a magnetic disk, detecting it by an optical sensor, and inputting the output of the sensor to a sector boundary reference generator and a light pattern error generator. CONSTITUTION:A light pattern label 8 on which a black pattern 8a and a white pattern 8b are printed alternately in a radius direction is stuck on the rotor 6 of a spindle motor 4 which drives the magnetic disk 2. The label 8 is irradiated with light from a light source 10, and reflected light from the label is inputted to the optical sensor 12, and the pulse following the rotational characteristic of the motor 4 is outputted from the sensor. Here, the number of patterns 8a and 8b in a circumferential direction is decided at the number sufficiently following the wow component and the flatter component of the motor 4. Afterwards, the output of the sensor 12 is inputted to the sector boundary reference generator 14 and the light pattern error generator 16, and results are sent to first and second counting logic circuits 18 and 22, and a sector boundary signal 24 is sent from the circuit 22.

公开(公告)号：JPH02158824A

公开(公告)日：1990-06-19

申请号：JP31204088

申请日：1988-12-12

Applicant: IBM JAPAN

Inventor： NAKAMURA TAKASHI ,  NUMATA TSUTOMU ,  OGAKI KAZUTAKA

IPC: G06F3/06

Abstract: PURPOSE:To effectively use the memory of a disk device by providing a shared storing means to write outputted data in conformity to prescribed preferential order and time division multiplex controlling means to read the stored data in conformity to the prescribed preferential order. CONSTITUTION:One storing means 10 is shared by a microprocessor 6, host computer 4 and the disk device 12, and the data to be outputted from the microprocessor 6, the host computer 4 and the disk device 12 is written in the shared storing means 10 in conformity to the prescribed preferential order. Then, the time division multiplex controlling means 8 to read the data stored in the shared storing means 10 to the microprocessor 6, the host computer 4 and the disk device 12 in conformity to the prescribed preferential order is provided. Namely, a memory function to store the data to be used by the microprocessor 6 to control the disk device 12 and the function to transfer the data between the disk device 12 and the host computer 4 are given to one storing means 10. Thus, the memory of the disk device 12 can be used effectively.