Detection of saved sectors on an optical disk

Details Detection of saved sectors on an optical disk Detection of saved sectors on an optical disk

1992-07-30

1994-03-22

Young, W. R.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 54, 369 58, G11B 700

Patent

active

052971155

ABSTRACT:
In an optical disk drive system, an apparatus and method for determining whether data read from a particular field within a particular sector of an optical disk corresponds to a code which specifies that the sector should not be erased. A crystal clock generates a synthesized clock signal. A front-end detector generates a signal synchronized to the synthesized clock signal which represents data read from the field. The signal is then serially shifted by a serial shift register. A comparator compares the shifted signal with the code specifying that the sector should not be erased. If there is a match, a counter is incremented. When the counter reaches or exceeds a pre-determined number, a signal is sent to the optical disk drive system indicating that the sector contains data which should not be erased.

REFERENCES:
patent: 5023854 (1991-06-01), Satoh et al.
patent: 5200944 (1993-04-01), Souma

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