US4885645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Write compensator for magnetic disk apparatus
Assignee: Toshiba Corp
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Filing: 1987-08-12
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Granted: 1989-12-05
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Expires: 2007-08-12
Abstract
Abstract A write compensator for a magnetic disk apparatus includes a flip-flop for latching write compensation information using not a recording data format conversion reference clock but converted recording data. The flip-flop 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 Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:19
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10212
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A write compensator comprising: data converting means for converting input recording data into a predetermined recording data format; write compensation information generating means for generating write compensation information on the basis of a conversion pattern of the input recording data or a data pattern of the recording data converted by said data converting means, said write compensation information generating means outputting a write recording data presence signal representing that recording data to be written is present; write compensation information storing means for storing the write compensation information from said write compensation information generating means in response to said write recording data presence signal and holding current write compensation information until the next write recording data signal is supplied; and write-compensating means for performing write compensation of the converted recording data on the basis of the write compensation information stored in said write compensation information storing means.
Claim 2
Dependent Claim
146 words
A write compensator comprising: data converting means for converting input recording data into a predetermined recording data format; write compensation information generating means for generating write compensation information on the basis of a conversion pattern of the input recording data or a data pattern of the recording data converted by said data converting means, said write compensation information generating means outputting a write recording data presence signal representing that recording data to be written is present; write compensation information storing means for storing the write compensation information from said write compensation information generating means in response to said write recording data presence signal and holding current write compensation information until the next write recording data signal is supplied; and write-compensating means for performing write compensation of the converted recording data on the basis of the write compensation information stored in said write compensation information storing means.
Claim 3
Dependent Claim
16 words
A compensator according to claim 1, wherein said write compensation information storing means comprises a flip-flop.
Claim 4
Dependent Claim
114 words
A compensator according to claim 1, further comprising: a delay circuit for receiving the write recording data presence signal output from said write compensation information generating means 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 for receiving the write compensation information from said delay circuit and said write compensation information storing means and outputting a write compensated signal as the recording data when a time corresponding to a supplied one of the delayed signal has elapsed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |