Track access control system for magnetic disk apparatus

Details Track access control system for magnetic disk apparatus Track access control system for magnetic disk apparatus

1988-06-06

1990-01-09

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7804, G11B 502, G11B 5596, G11B 2108

Patent

active

048932019

ABSTRACT:
An improved track access control system for a magnetic disk apparatus connectable to a variety of host controllers without any change thereto, and capable of an offset correction. A control unit in the disk apparatus controlling a moving unit to access a magnetic head at a desired track on the magnetic disk in response to a seek command from a host controller and using an offset correction value which is previously obtained by accessing the magnetic head at a track storing the fine positioning information, and carrying out an offset correction, includes a timer to which a time to be offset-updated within a predetermined timing is set. The control unit makes an offset correction value invalid in response to the time out of the timer, and when a seek command from the host controller in response to the offset invalidity is issued within a predetermined time, the control unit carries out an offset correction in response to the seek command, and executes the seek command, or inhibits an output of an index signal, carries out an offset correction at a previously given track from the host controller, and thereafter, permits an output of the index signal. The control unit sets the time for updating the offset correction to the timer.

REFERENCES:
patent: 3812533 (1974-05-01), Kitamura et al.
patent: 4136365 (1979-01-01), Chick et al.
patent: 4697213 (1987-09-01), Kitamura
patent: 4825309 (1989-04-01), Shoji et al.
patent: 4827362 (1989-05-01), Baba
European Search Report EP 88 30 5094 by Examiner Chaumeron B. in Berlin on Feb. 21, 1989.
"Correction of Data Track Misregistration in Servo Controlled Disk Files", IBM Technical Disclosure Bulletin, Nov., 1974, pp. 1781-1783, vol. 17, No. 6.

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