A Redundancy Recovery Code Error Correction Method for Optical Disk Data Storage

Abstract

The invention provides a redundancy recovery code error correction method used for compact disc data storage, and relates to the field of compact disc data storage. The specific method comprises the following steps of performing redundancy recovery code coding on user data, forming a data stripe group by coded redundancy recovery codes and the user data, performing error correction and modulationcoding on the coded data stripe group again, and burning the data stripe group coded again on a compact disc; and reading the burnt data stripe group, performing modulation and error correction decoding firstly, and when unreadable error data is read, performing redundancy recovery code decoding to restore the user data. The method can be compatible with error correction codes of existing standards of the compact disc; the error-tolerant rate of the compact disc is increased; and especially burst errors in a circumference range with the width less than 33 microns, namely, 100 magnetic tracks are restored in data storage of the blue-ray disc.

Description

technical field [0001] The invention relates to an error correction method for optical disc data storage, more specifically, a redundant recovery code error correction method for optical disc data storage is proposed, which is used to improve the error tolerance rate of optical disc data storage. Background technique [0002] With the development of optical disc technology, the technology of recording data in multiple layers has appeared, increasing the data density. Due to the increase of recorded data per unit density, the error data caused by damage of the same size on the optical disc will also increase. [0003] The principle of optical disc data storage is as follows: when data is to be recorded on a blank optical disc, laser beams with high and low powers are used to ablate the dye layer of the optical disc. The bumps represent the binary information stored on the disc. When reading the disc information, due to the different reflectivity of the pits and bumps to the...

AI Technical Summary

Problems solved by technology

The first type is random errors, which are mainly caused by factors such as the tilt of the optical disc and the defocus of the laser spot. Caused by scratches, dust, fingerprints, etc. on the surface of the disc, the length of the error is long, and it is easy to form a concentrated distribution, which may not be corrected

like Figure 7 As shown, the recoverable data range of Blu-ray discs currently using the standard error correction code mechanism is: in the tangential direction, burst errors with a length less than 4.5 mm; in the radial direction, burst errors of any length in the radial direction cannot be recovered errors, so a method with stronger error correction capability is needed to meet the data error correction requirements

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