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Update file on FAT SF on the fly

Question asked by kilshtein.daniel on Dec 4, 2012
Latest reply on Dec 4, 2012 by kilshtein.daniel

Sorry for the trivial question but I need to add some data to a text file on the fly.
Each time I need to open an existing file and add a line of text to it then close (to avoid data loss on power off)
I'm new to a FS programming and I can't find the option for append (a+). Can I do it on the stm3220g-eval? Do I have to read the entire file content then create a new file to store the data in it?