Garbage data in file after sudden power loss

I am using a flash with FAT32 system. I am continuosly writing data to a file using file system APIs from rtos(SMX). However, after sudden poweroffs, the file contains garbage values just above the first file entry on system reboot.

I run chkdsk utility, but it doesn't fix any problem.

Any idea how can i get rid of these garbage entries even on unclean power of开发者_如何转开发fs?

If you expect sudden power loss, you'll need to disable all caching/buffering on file writes. Of course you'll also need to deal with partially-written files, but that should at least prevent trailing garbage.

I don't know the API you're using, but this might be done by mounting the drive "synchronously" (e.g., mount -o sync in Linux) or by opening individual files with specific options. If you do disable buffering on individual file writes, you may still run the risk of corrupting the FAT, however, and losing all the files.