Quote:
Originally Posted by ownedbycats
I just got this error upon updating a fanfic with a data folder. The metadata updated, but the ePub wasn't.
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An error at that location should have the
opposite effect you describe--updated epub but not metadata. Unless Calibre didn't roll back the update, in which case, you might still see metadata update.

That's Calibre code and the 'data' dir is a Calibre feature. Kovid has decided Calibre needs to be a lot more assertive about windows file locking. I don't know enough about it to say whether he's correct or not.
After the third time I bumped into the
problem I reported I went back to Calibre v6.19.1. I was seeing it happen with file explorer 'Quick access', not just searches.
I haven't done anything with data directories, but judging by the system32 directory, I would suspect it's something somewhere looking for a relative 'data' without a full path.