Dynamic magnetic information storage or retrieval – General processing of a digital signal
Reexamination Certificate
2006-04-04
2006-04-04
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
C360S046000, C360S065000
Reexamination Certificate
active
07023634
ABSTRACT:
Provided in a disk drive of a perpendicular magnetic recording system is a data channel to execute signal processing suited to the characteristics of either servo data signals or user data signals read from a disk. This data channel decodes data by executing PRML signal processing of positive coefficient PR equalization for data signals of vertical rectangular waveform in the read signals read by a read head from the disk. The data channel converts servo signals of vertical rectangular waveform into differentiated waveform signals, and reproduces servo data from the differentiated waveform signals.
REFERENCES:
patent: 5341249 (1994-08-01), Abbott et al.
patent: 5357378 (1994-10-01), Urakawa
patent: 5384671 (1995-01-01), Fisher
patent: 5729410 (1998-03-01), Fontana, Jr. et al.
patent: 5886842 (1999-03-01), Ziperovich
patent: 5955211 (1999-09-01), Maeda et al.
patent: 6097579 (2000-08-01), Gill
patent: 6178053 (2001-01-01), Narita
patent: 6178144 (2001-01-01), Huber
patent: 6337889 (2002-01-01), Mita et al.
patent: 6671112 (2003-12-01), Murakami et al.
patent: 2002/0089773 (2002-07-01), Shimomura et al.
patent: 2-126404 (1990-05-01), None
patent: 5-101312 (1993-04-01), None
patent: 11-066755 (1999-03-01), None
patent: 11066755 (1999-03-01), None
patent: 2001-189001 (2001-07-01), None
Muraoka et al., “Evaluation of the Error Rate for a Single-Pole Writing Head and Double-Layer Perpendicular Media,” Journ. Of Magnetics Soc of Japan #23, pps 1065-1068.
Yamoto et al., “A Study of PRML Systems for Perpendicular Recording Using Double layered Medium,” IEE Trans. On Magnetics, vol. 36, #5 (2000), pps 2164-2166.
Japanese Office Action, dated Jul. 27, 2004 from the Japanese Patent Office for Application No. 2001-303879.
Kabushiki Kaisha Toshiba
Negron Daniell L.
Pillsbury Winthrop Shaw & Pittman LLP
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