System for storing data in a separate memory when the number of

Details System for storing data in a separate memory when the number of System for storing data in a separate memory when the number of

1989-11-27

1990-12-18

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78040, G11B 555

Patent

active

049790595

ABSTRACT:
In a data memorizing device in which a magnetic head is supported on a recording surface of a disk-like recording medium carrier rotatably driven, an actuator carrying the magnetic head is moved to bring the magnetic head to a predetermined position on the magnetic recording medium carrier, an error detection circuit compares a position-determining time required in the movement of the magnetic head from starting the movement of the head to the completion of the movement with a reference time previously determined by an instruction from a computer, and outputs a positioning-error signal in accordance with the determination of error in positioning the magnetic head when the value of the position-determining signal is greater than the value of a reference time. The data memorizing device further comprises an error factor detection means which counts the number of errors in determining the position of the head on the basis of the number of the positioning-error signals provided by the error detection circuit in the positioning operation conducted for a predetermined time period or the positioning operations conducted at a predetermined number, and outputs a pulse signal when the value of a positioning-error factor, which is obtained by dividing the number of the errors by the predetermined time period or the predetermined number in the position-determining operations, is greater than a predetermined value as a result of comparison of the values.

REFERENCES:
patent: 4547822 (1985-10-01), Brown
C. J. Kennedy, Timer to Sense an Incompleted Seek on Disk Files, IBM TDB, vol. 7, No. 11, Apr. 1965, pp. 1021-1022.

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