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RL-FlashFS SD fopen problem

Hi all,

I am using LPC2368 ARM processor to operate SD card through MCI Interface(1 bit Data line). After formatting the SD using fformat() then new file created with fopen() function & can write in that file.
But when a new file created (without fformat()) or exixting file (created by Windows OS)it is not possible to write anything in that. But I can read that exixting file.

Anyone have an idea?