Usually synchronize all picture folders in LR to see any new files added. Did the same after updating to 13.3 the other day. At the end of the day, all data is manually synchronize to as second PC. To my surprise, the program had flagged some 18,000 changed files.
To cut a long story short, LR had written new xmp data to all these raw files, including directories dating back to 2010.
To clarify, raw data was written to a single Database in older days.
However, this shouldn't be happening without my knowledge
In the old days Camera Raw stored XMP in a central database if you wanted that. I do not think that Lightroom ever used a central database if you enabled writing metadata to files. It will use XMP sidecar files for raw images and embed metadata in the headers of RGB images. Of course it always writes metadata to the catalog and still does.
Thank you for the reply. Writing metadata to files is not enabled. Have used LR since it first appeared and has so far never touched files, other than worked on.
Have restored all directories to what they were and will keep an eye them. See if they change again
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