EP0256498A2
Expired / Lapsed
EP
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Write compensator for magnetic disk apparatus
Assignee: Toshiba Corp
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Filing: 1987-08-11
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Granted: —
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Expires: 2007-08-11
Abstract
Abstract A write compensator for a magnetic disk apparatus includes a flip-flop (23) for latching write compensation information using not a recording data format conversion reference clock but converted recording data. The flip-flop (23) latches the write compensation information until the next recording data is input. The recording data is write-compensated on the basis of the latched write compensation information.
Inventors
- 👤 Yasuichi Patent Division K.K. Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 09:47
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10212
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
A write compensator for a magnetic disk apparatus, said write compensator being adapted to convert input recording data into a predetermined recording data format, perform write compensation of converted recording data in accordance with a data pattern of the converted recording data, and record write-compensated recording data in a recording medium, characterized in that there are provided: data converting/write compensation information generating means (2l) for converting the input recording data into the predetermined recording data format and generating write compensation information on the basis of the data pattern of the recording data converted by said data converting means; write compensation information storing means (23) for storing the write compensation information from said data converting/write compensation information generating means (2l) on the basis of the recording data converted by said data converting/write compensation information generating means (2l); and write-compensating means (l7, l5, l9) for write-compensating the converted recording data on the basis of the write compensation information stored in said write compensation information storing means (23).
Claim 2
Dependent Claim
165 words
A write compensator for a magnetic disk apparatus, said write compensator being adapted to convert input recording data into a predetermined recording data format, perform write compensation of converted recording data in accordance with a data pattern of the converted recording data, and record write-compensated recording data in a recording medium, characterized in that there are provided: data converting/write compensation information generating means (2l) for converting the input recording data into the predetermined recording data format and generating write compensation information on the basis of the data pattern of the recording data converted by said data converting means; write compensation information storing means (23) for storing the write compensation information from said data converting/write compensation information generating means (2l) on the basis of the recording data converted by said data converting/write compensation information generating means (2l); and write-compensating means (l7, l5, l9) for write-compensating the converted recording data on the basis of the write compensation information stored in said write compensation information storing means (23).
Claim 3
Dependent Claim
17 words
A compensator according to claim l, characterized in that the recording data format is modified frequency modulation.
Claim 4
Dependent Claim
78 words
A compensator according to claim l, characterized in that said data converting/write compensation information generating means (2l) outputs a write recording data presence signal representing that recording data to be written is present, and said write compensation information storing means (23) stores the write compensation information from said data converting/write compensation information generating means in response to the write recording data presence signal and holds current write compensation information until the next write recording data signal is supplied.
Claim 5
Dependent Claim
20 words
A compensator according to claim l, characterized in that said data converting/write compensation information generating means (2l) comprises a decoder.
Claim 6
Dependent Claim
19 words
A compensator according to claim l, characterized in that said write compensation information storing means (23) comprises a flip-flop.
Claim 7
Dependent Claim
124 words
A compensator according to claim 3, characterized in that said compensator further comprises: a delay circuit (l7) for receiving the write recording signal output from said data converting/write compensation information generating means (2l) and generating a first delayed signal for compensating recording data writing in an early direction, a second delayed signal for performing no write compensation of the recording data, and a third delayed signal for compensating recording data writing in a late direction; and a gate circuit (l5, l9) for receiving the write compensation information from said delay circuit (l7) and said write compensation information storing means (23) and outputting a write compensated signal as the recording data when a time corresponding to a supplied one of the delayed signal has elapsed.
References Cited (Backward Citations)
No citation records indexed.
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