There are lots of reasons responsible for corruption of BKF files like:
The size limitation of BKF files depend currently using file system. On File Allocation Table (FAT) this limit is set as 4GB. It means if you are using FAT then you can create BKF only 4GB. If you're running BKF data cross this desired limit then it might be corrupt & you need an excellent tool to Repair Corrupt BKF Files.
BKF Recovery Software is only one of best or excellent way to repair corrupt files when it goes behind size limit. But you can trust on BKF Repair Software & repair entire corrupt data instantly.