fatfs v0.14a December 5, 2020:

- Limited number of recursive calls in f_findnext().
- Fixed old floppy disks formatted with MS-DOS 2.x and 3.x cannot be mounted.
- Fixed some compiler warnings.

documents/doc/printf.html

@@ -39,7 +39,7 @@ int f_printf (
 
 <div class="para ret">
 <h4>Return Values</h4>
-<p>When the string was written successfuly, it returns number of character encoding units written to the file. When the function failed due to disk full or any error, an <tt>EOF (-1)</tt> will be returned.</p>
+<p>When the string was written successfuly, it returns number of character encoding units written to the file. When the function failed due to disk full or any error, a negative value will be returned.</p>
 </div>