I have read the document and have understood that the parameter within the parenthesis of file.seek() function must be an unsigned long.
After seeking the position, I read the file using file.read() function and then I file.print() the new data. But failed. Definitely, I am wrong somewhere.
Would you be kind enough, to show me how to write the code to achieve my goal. That will help me to grasp the idea more easily. Thanks in advance.