Hello, On my Mac Pro 2010, I have about 130,000 files that lost their Creation Date. Snow Leopard shows a "- -" and Mountain Lion shows the Unix "beginning of times" 1-1-1970 01:00. Files affected are mainly Canon RAW files (.CR2) but also .xls, .pdf, .txt, .mht, .htm and many many more. I have been advised to replace my backup battery (the BR2032 behind the video card), which allegedly should be responsible for this issue. I haven't seen any faulty clock settings but that may be explained by the fact that I use a time server so an empty battery could go unnoticed. My questions: #1 Is the backup battery the real cause of this problem? #2 If so, how can an empty battery remove/empty the Capture Date field? #3 How can so many files be affected (well over 100,000)? #4 Do I need to fix this or can I just leave the affected files Capture Date-less? #5 If I need to fix, how? Thanks!