UDF File Structure and Volume of Blu-ray Disc and its requirements

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UDF File Structure and Volume of Blu-ray Disc and its requirements

The blu-ray Rewritable discs are non-sequential recording media. The drive unit performs the read-modify-write and defect management operations. So, there remains no need for the sparing table and virtual allocation table and in the file system.

The factors of blu-ray that have impact on UDF are:
2k bytes for logical sector and 64k bytes for ECC block

For BD-RE, BD-R and BD-ROM, there are different requirements for the UDF volume and file structure and are individually defined in different specifications for each of the above media types. There is also included defect management in the Blu-ray Recordable discs. This feature eliminates the need for the Sparing Table in the file system. The requirements are simplified for the Blu-ray Read-Only discs and therefore, there is no need for read-modify-write, overwriting or incremental recording of user data. The defect management system allows for the replacement of defective clusters as well as enabling the logical overwriting of previously recorded user data.
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