Method and apparatus of identifying disc types
AssigneeHitachi-LG Data Storage Korea, Inc.
InventorCheol Jin
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Abstract
Embodiments of a method and apparatus of identifying optical disk types according to the present invention can identify the type of an optical disk (e.g., DVD-RAM, DVD-RAM, or DVD±RW) based on comparisons between a plurality of signals. For example, comparisons between the magnitudes of DPD and DPP tracking error signals and their respective reference values can be used. If an optical disk is identified as DVD+RW or DVD-RW, embodiments according to the present invention can further determine whether the optical disk is DVD+RW or DVD-RW. For example, the frequency of a wobble signal resulting from the shape of tracks formed on the optical disk and variables that affect the wobble frequency (e.g., the rotational speed of the optical disk and the current track position) can be used.
Claims24
A method of identifying a plurality of storage medium types, comprising:
- (a) creating a first signal and a second signal from light reflected from a storage medium;
- and
- (b) identifying the type of the optical disk based on comparisons between the two signals and a respective reference value.
An apparatus for identifying a type of optical disk, comprising:
- a processing unit configured to convert a reflected beam from a loaded optical disk into electrical signals, and generate a first signal and a second signal therefrom;
- and
- a controller configured to identify the type of the loaded optical disk based on comparisons between a level of the generated signals and a respective reference value.
A method of identifying storage medium types, comprising:
- (a) detecting a frequency of a wobble signal resulting from the shape of tracks formed on a storage medium;
- and
- (b) identifying the type of the storage medium based on the detected wobble frequency, rotational speed and position.
An apparatus of recording data on an optical disk or playing back data from an optical disk, comprising:
- a read-out circuit configured to irradiate a laser beam onto an optical disk, and convert a reflected laser beam from the optical disk into electrical signals;
- a detector configured to detect a frequency of a wobble signal resulting from the shape of tracks formed on the optical disk;
- a servo unit configured to servo control of the read-out circuit;
- and
- a controller configured to identify the type of the optical disk based on the detected wobble frequency.
Dependencies are inferred from the claim text.