Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2006-08-15
2006-08-15
Klimowicz, William (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
Reexamination Certificate
active
07092181
ABSTRACT:
A method of enhancing the thermal stability of gray codes is disclosed. The gray code block in a servo area is recorded with a combination of two different magnetization directions. When the two different magnetization directions are expressed as “+” and “−”, the information “1” is recorded as “++−−” or “−−++” with the information “0” recorded as “+−+−” or “−+−+”. Since the filter for gray code demodulation is provided with a perpendicular recording mode, the servo area does not use long-wavelength signals that are susceptible to thermal demagnetization. As a result, thermal stability is enhanced.
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Hamaguchi Takehiko
Nishida Yasutaka
Sawaguchi Hideki
Hitachi Global Storage Technologies Japan Ltd.
Klimowicz William
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Tzeng Fred T.
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