Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-06-21
1993-08-31
Smith, Jerry
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 57, 360 61, 360 7705, 360 75, G11B 555, G11B 502
Patent
active
052414353
ABSTRACT:
A method of recording a servo signal on each track of a magnetic disk includes a first signal for demagnetizing the magnetic disk and a second signal for forming the servo signal. The recording width (core width) of the magnetic head is made greater than the width of the track. Parts for recording signals and not recording signals are set in each track. The first and second signals are selected and recorded in the signal recording part, thereby to form the servo signal. Current to be conducted to the magnetic head is cut in the part for not recording signals, and the track is skipped to the next part for recording signals. When the recording of the track has ended, the magnetic head is moved to the next track, and the above steps are repeated.
REFERENCES:
patent: 4701815 (1987-10-01), Yada et al.
patent: 4777544 (1988-10-01), Brown et al.
patent: 4864434 (1989-09-01), Janz
Hata Yuji
Ogawa Takuji
Ono Kazuo
Saito Shigeyoshi
Sega Masahiko
Garland Steven R.
Hitachi , Ltd.
Smith Jerry
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