Tag Options
Write tags to files
Uncheck to disable Picard from writing metadata to your files. Picard may still move or rename your files according to your settings.
Preserve timestamps of tagged files
If checked, Picard will not update the “Last Modified” date and time of your music files when it writes new tags to them.
See also
Details: Before Tagging / ID3 Files / AAC Files / AC3 Files / WAVE Files