Look at the time on your computer, and look at the timestamp of your file.

There are all sorts of reason which could lead to a file's timestamp to be more recent than what your computer thinks is the current time.




>________________________________
>From: Shiyuan <gshy2014@gmail.com>
>To: help-gnu-emacs@gnu.org
>Sent: Wednesday, October 12, 2011 11:31:00 AM
>Subject: file changed prompt
>
>
>Hi, 
>    My emacs keeps prompting  "file on disk changed". But actually it's not. What could cause this problem? 
>Thanks
>
>
>
>
>Shiyuan 
>
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>