>A virgin savefile has both set to zero Savefile objects do not have checksums, true. *Reading* a save file generates checksums into the virtual 528-byte records you get, and *writing* to a save file requires checksums in the corresponding spots where they would have appeared during a read. CPF5175 or CPF4525 occurs during a write to a save file if a record 12-byte checksum or the file 16-byte checksum is binary zero, or if incorrectly recalculated.
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