SD: seek and write seems not working!


hi guys,
i'm doing simple opening, seeking , writing operation sd file result appending content instead of writing @ seek position.

am wrong?

      file thefile= sd.open(filename, file_write);
      if (!thefile) return false;
      thefile.seek(0x3ff00);
      thefile.write(mybyte);
      thefile.close(); 
      return true;


i've dumped position() before , after seek operation , "pointer" move corrcty size() of fiel given address (0x3ff00) mybyte written @ location size() + 1...

what mean size() ?

is mybyte byte or char?


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