I have tried your advice but unfortunately it does not correct the problem. I have done some erperimenting and apparently the problem is restricted to only one directory. All directories work as expected except for the base of my removable SD card (/mnt/extcard). If I sync /mnt/extsdcard I will only get new files added to /mnt/sdcard or any of its subdirectories (e.g., new photos taken) but not any of the old files. Unfortunately all of my data is written to the SD card . Thanks for your help, Ken G.