The default value will be used because the specified maximum block length is invalid. (default maximum block length = aa....aa bytes)

The value of the dam_max_block_size operand of the DAM service definition does not meet the condition of (sector length x n - 8). As the maximum block length, the system uses the block length of a file that has the longest block among the logical files defined in the DAM service definition. However, if a logical file is not defined in the DAM service definition, the maximum block length is 504 bytes.

aa....aa: Block length used as the maximum block length (decimal number)