Defect management data access method

Abstract

The invention provides an access method of defect management data, comprising the following specific steps: a disk drive accepts an instruction to read the required block, then the disk drive reads the required block of the disk and stores the data at a first buffer zone, then the disk drive caches the required defect management data from a caching buffer zone or reads the required defect management data from the defect management zone of the disk, and stores the required defect management data at a second buffer zone, then the disk drive inspects whether the required defect management data are popular data and copies the data to the caching buffer zone if the answer is yes, then replaces the defect data of the blocks in the first buffer zone with the defect management data, and outputs the replaced block data in the first buffer zone to accelerate the accessing process.

Description

technical field [0001] The invention relates to an optical drive, in particular to an access method for processing and replacing defect management data stored in the optical disc when the optical drive reads the optical disc. Background technique [0002] Since the optical disk uses tiny and dense marks to increase the storage capacity, as long as it is stained with dirt, dust or scratches, the tiny marks will be covered, which will affect the correct interpretation of the marks. The optical drive provides a mechanism for defect management, so that the data of the defective block can be stored in the replacement area on the optical disc. [0003] Such as figure 1 As shown, it is the access process of known optical disc defect management data. The optical disc D is sequentially divided into lead-in area, replacement area 1, data area, replacement area 2 and lead-out area from the inner circle to the outer circle. When the optical drive reads the optical disc D, firstly move...

AI Technical Summary

Problems solved by technology

[0005] However, in the known access method of defect management data, the optical drive must move the read head to the defect management area after reading the data block each time, and search and read all the data in the replacement area 1 or replacement area 2 before and after the optical disc. The required defect management data, after completion, move the reading head back to the data area, and read the block data of the next command

When the optical drive reads the optical disc, the reading head moves back and forth between the data area and the defect management area, which increases the reading time and reduces the overall performance of the optical drive

Therefore, there are still problems to be solved urgently in the access of defect management data in the optical drive

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