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Abbreviation for Block Error Rate. In CD production (and on hard disks) data is written into a series of blocks. A block usually contains 512 or 1024 bytes of data. BLER refers to how many blocks per unit of time are in error or can’t be read. BLER is inversely proportional to the readability of a disc. That is, the more block errors the more difficult the disc is to read.

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