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hi, 
I read http://www.keil.com/forum/docs/thread14845.asp 
. 
It is clear that, there is no way to modify previously written data
(SDCard) with FlashFS. 
e.g (as Johann wrote) 

 
fH = fopen(FILE_NAME_CLOCK, &amp;quot;a&amp;quot;);
fseek(fH,20,SEEK_SET);
fwrite(jbuf</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator></channel></rss>