Write power setting method and optical disc device

Abstract

A disc write power setting method and a disc device are provided. The write power setting method comprises reading writing characteristic information from a disc; writing test data for each of n write power values and detecting modulation with respect to the written data; calculating, for each of k power coefficients, a straight line approximating a curve composed of n points which have x coordinates corresponding to differences between a corresponding power coefficient and the write power values used for the test data writing and y coordinates corresponding to the product of modulation for the write power values and a corresponding difference and selecting a straight line having the smallest error with a corresponding curve among k straight lines and the power coefficient corresponding to the straight line; and setting optimum write power based on the selected straight line, the selected power coefficient and the read writing characteristic information.

Description

technical field [0001] This document relates to a method for reducing write power deviations. Background technique [0002] Large-capacity disk media for storing a large amount of data and high-speed recording devices for storing large-capacity data on the medium in a short time are commercialized. [0003] The optical disc writing apparatus performs a optimum power control (PCA) operation in a predetermined area of ​​the optical disc such as a power calibration area (PCA) to detect an optimum write power, and uses the detected optimum write power to perform a requested write operation, thereby ensuring the write quality. [0004] However, the servo state applied to test data writing depends on calibration factors such as focus balance, tracking balance, and tilt, and generates measurement errors when performing OPC operations, therefore, at the optimum write power detected even from the same disc There are also deviations. When the writing density or writing speed is hig...

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Problems solved by technology

[0004] However, the servo state applied to test data writing depends on calibration factors such as focus balance, tracking balance, and tilt, and generates measurement errors when performing OPC operations, therefore, at the optimum write power detected even from the same disc There are also deviations in

This deviation from optimum write power may degrade write quality when write density or write speed is high

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