DEVICE AND METHOD FOR PROCESSING INFORMATION

Japanese Patent JP3934756

B2

PROBLEM TO BE SOLVED: To suppress noises at the change point of timing to impress a DC erasure magnetic field by extracting only the signal provided from information recorded at a section, to which no magnetic field is impressed, on a second magnetic substance through differential processing between signals provided from information recorded at sections, to which no magnetic field is impressed, on first and second magnetic substances.
SOLUTION: In prescribed areas on a PET 23 to be a substrate, a read/write track 24a as the first magnetic substance respectively mixing an S magnetic substance and a high hold recording magnetic substance and a one-time recording track 24b as the second magnetic substance are provided. Then, that one- time recording track 24b is read by the magnetic head for reading of an information processor, and the change point of timing at the sections to impress the magnetic field and not to impress the magnetic field is controlled in the form of slope. The signal at the section, where no magnetic field is impressed, of the one-time recording track 24b is extracted by the differential processing between information signals recorded at the magnetic field sections of these read/write track 24a, to which no magnetic field is impressed, and one-time recording track 24b.

Masato Namiki

JP25732097A

June 20, 2007

September 22, 1997

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Toshiba Corporation

G06K17/00; G06K19/06; G06K19/10; G11B5/09; (IPC1-7): G06K17/00; G06K19/06; G06K19/10; G11B5/09

JP9180356A
JP9062803A
JP7311904A
JP7078404A
JP9106614A
JP9106615A
JP9134519A
JP9297917A

Takehiko Suzue
Sadao Muramatsu
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Shoji Kawai

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