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US 2005/0088946 A1Published application
Holographic ROM disk having multiple error correction code rates
AssigneeDaewoo Electronics Co., Ltd.
InventorJoo-Youn Park
Life of this patent
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Abstract
A bare type holographic ROM disk is easily contaminated with a fingerprint of a user. Specifically, a radially outer surface of the disk has a higher contaminant level to be more contaminated than a radially inner surface thereof. An error correction capability on the radially outer surface can be increased by applying an error correction code having a larger parity on the radially outer surface.
Claims5
A holographic ROM disk comprising:
- N-segmented storage portions, N being a positive integer larger than 1, which are divided based on a contamination level thereof,
- wherein an error correction capability in each of the N-segmented storage portions depends on the contamination level.
Dependencies are inferred from the claim text.