Magnetic disk apparatus

Details Magnetic disk apparatus Magnetic disk apparatus

1994-11-29

1996-06-11

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, G11B 5596

Patent

active

055262015

ABSTRACT:
A seek command including a cylinder address and a head address is generated from a disk control unit. In a magnetic disk unit, an off-track amount is read out by the head address obtained by the reception of the seek command with reference to a correction table, and an off-track correcting state in which the off-track amount is eliminated from a position control signal is produced during the seeking operation until the start of the position control. A function to instruct the dependent magnetic disk unit to execute the measuring process of the off-track amount in accordance with a time schedule stored in a time table is provided for a higher-order magnetic disk control unit. The generation of a measuring command during the execution of a command chain is suppressed. When receiving the measuring command from the disk control unit, the magnetic disk unit measures the off-track amount of each data disk for a reference position of a servo disk and stores into the correction table.

REFERENCES:
patent: 4819095 (1989-04-01), Asano et al.
patent: 4907105 (1990-03-01), Kurzweil, Jr.
patent: 4969059 (1990-11-01), Volz et al.
patent: 5109502 (1992-04-01), Sasamoto et al.
patent: 5185681 (1993-02-01), Volz et al.
patent: 5347410 (1994-09-01), Narita et al.

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