Information recording and playback device and associated disk-ty

Details Information recording and playback device and associated disk-ty Information recording and playback device and associated disk-ty

1994-12-22

1998-02-10

Edun, Muhammad N.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 50, 369 32, 369 58, G11B 700

Patent

active

057176698

ABSTRACT:
An information recording and playback device for use with disk-type medium formatted in a ZCAV format. Sector marks are written on the disk-type recording medium and differ in frequency according to the zone to which the sector belongs. Where frequencies in adjacent zones are close, sectors in adjacent zones can be written with different polarities or sizes. The information recording and playback device is provided with a number of sector mark detection circuits, which number the same or less than the number of zones formed on the recording surface of the disk. Each sector mark detection circuit is set to correspond to one zone, and output a signal when the pattern of the sector marks of the zone to which that sector mark detection circuit corresponds can be detected. When the sector mark is detected by one of these sector mark detection circuits, the actual position of the head is determined. Then, the frequency of a reference clock signal is switched to a clock signal which has a frequency equal to the recording frequency which corresponds to zone where the head is located. Where the number of sector mark detection circuits is less than the number of zones, the sector mark detection circuits are configured so that they can detect the patterns of the sector marks of all zones by changing the settings to match the target zone containing the target sector and as many adjacent zones as can be covered by the other sector mark detection circuits.

REFERENCES:
patent: 5477512 (1995-12-01), Kubo et al.

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