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Method for discriminating disk data orbital distance

A discriminant method and technology of data track, applied in optical recording/reproduction, data recording, recording of information on disk, etc., can solve the problem that the radius length is not easy to be accurate and easy to obtain, affects the degree of track gauge error and the complexity of calculation Degree and other issues

Inactive Publication Date: 2011-01-26
QUANTA STORAGE INC
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Problems solved by technology

The disadvantage of this method is that the radius length is not easy to be accurate and easy to obtain, because the correctness of the data frame number depends on the stability of the entire data decoding of the track
Moreover, the acquisition of the track gauge requires a series of conversions, and the accuracy of each conversion will affect the error degree of the track gauge and the computational complexity

Method used

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  • Method for discriminating disk data orbital distance
  • Method for discriminating disk data orbital distance
  • Method for discriminating disk data orbital distance

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[0017] The first embodiment of the present invention is to use the optical drive in the constant angular velocity (Constant AngularVelocity, CAV) operating mode, that is, the optical drive rotates the optical disc at the same speed, and the optical disc with a larger track gauge corresponds to the same data segment x position. The longer the radius, the higher the line rate. When the read head of the optical drive reads the optical disc data recording signal, the data phase-locked loop will generate a clock synchronous with the optical disc data recording signal read by the read head. The data recording signal read by the optical drive per unit time represents the arc length of the optical disc read by the optical drive per unit time, and also represents the linear velocity of the optical disc at the read point. The linear velocity can be obtained by measuring the data transmission frequency value at this position. Therefore, the size of its frequency value can reflect the cha...

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Abstract

A method for judging track gauge of optical disc data includes utilizing phase-locked loop to measure out data transmission frequency at preset data section position on an optical disc i.e. feature value, querying a feature value list and utilizing interpolation or approximate means to calculate out track gauge of optical disc.

Description

technical field [0001] The invention relates to a discriminative method for disc data track pitch, in particular to a discriminative disc data track pitch discriminative method for measuring disc track pitch by using data transmission frequency value or bearing rotational speed value. Background technique [0002] In some traditional optical discs, the standard track pitch is reduced to increase the storage capacity of the optical disc, in order to avoid misjudgment by the optical drive or selection of the type of optical disc that cannot be judged. The traditional method of measuring the track pitch of an optical disc is to read a fixed data segment length X for an optical disc with an unknown track pitch (assuming that the track pitch is d), then the read data area A=X·d. On the other hand, if the radius of the starting point of the fixed data segment length X is R S , the radius of the end point is R E , then the area of ​​the ring with a fixed data segment length X can...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B19/12G11B20/10G11B7/00
Inventor 陈尚昊刘安特
Owner QUANTA STORAGE INC