Apparatus and method for recording compressed data with recordin

Details Apparatus and method for recording compressed data with recordin Apparatus and method for recording compressed data with recordin

1992-09-03

1995-04-11

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 32, 360 48, G11B 509, G11B 500

Patent

active

054064287

ABSTRACT:
Compressed digital data obtained by compressing digital input data by, for example, a compression ratio of four, which reduces the amount of data to one fourth of the original amount, is recorded on a magneto-optical disk or other recording medium. The block of compressed data resulting from compressing one block of the input data is recorded on the disc in a time in a fraction (one fourth in the example) of the real time duration of the input data. In the remaining time, the block of recorded data is read out from the disc in the next fraction of the real time duration of the block of input data. The read out block of compressed data is compared with the block of compressed data, and, when the read out block of compressed data does not match the block of compressed data, the same block of compressed data is again recorded in the same place on the disk in the next fraction of the real time duration of the block of input data. This way, it is possible to achieve a recording with high integrity and reliability even under adverse conditions.

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