Disk unit performing control using sector pulses

Details Disk unit performing control using sector pulses Disk unit performing control using sector pulses

1994-11-21

1997-07-22

Kim, W. C.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 7814, G11B 509, G11B 5596

Patent

active

056508824

ABSTRACT:
An object of the present invention is to minimize an overhead attributable to internal control and to provide a CDR type disk unit in which even when a head moves over a zone boundary, a sector pulse indicating a destination sector can be generated reliably without waiting for an index pulse. The disk unit includes a processing unit; a sector pulse generation unit which generates a sector pulse according to a signal written in the servo information on medium surface; and a format control unit which starts the formatting control when said sector pulse is received after a activating command is received from said processing unit; a target sector detection unit which detects the instant when said head reaches the target sector. The sector pulse generation unit stops outputting the sector pulses to the format control unit from when the access operation starts until a target pulse is received from the target sector detection unit.

REFERENCES:
patent: 4016013 (1977-04-01), Ottesen
patent: 5050013 (1991-09-01), Holsinger
patent: 5068755 (1991-11-01), Hamilton et al.
patent: 5274509 (1993-12-01), Buch
IBM Technical Disclosure Bulletin, entitled "High Speed Track Format Switching for Zoned Bit Recording," vol. 36, No. 11, pp. 669-673, dated Nov. 1993.
IBM Technical Disclosure Bulletin, entitled "Early Interrupt for Disk Controller," dated Feb. 1983.

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