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Retain information memory on MSP430 in mass erase operation?

MSP430F2619 has 256 bytes of information flash memory. This memory is again segmented in 4, 64 bytes segments. Segment A of this memory can't be erased during mass erase and production programming. I want to store device specific configuration data which is more than 105 bytes long. This I will store in Segment A and B. But how do I make sure that part in segment will remain even after mass erase or production programming.