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Whether or not one believes thehawkman ought be concerned about whether calibre does or doesn't change checksums, there is an anomaly here.
If I rename or move or copy a file in Windows or Solaris the checksums don't change, and I'd bet London to brick on that Linux & OS/X are the same. The only things that change are the file modify date in the case of a rename or the create date in the case of a move or copy.
When I add a book to calibre I thought I was simply doing a copy and possibly a rename. However if I drop a 'new book' into calibre, I tested a PDF and a prc, the checksums of the book file change --- but if I copy a book from a Calibre library into another folder, and rename it and drop that book into another Calibre library the checksums of the book file don't change.
So why & what is it that calibre changes in data stream of a file the first time it sees the file - the file name is contained with the file system index and plays no part in computing checksums, which are computed from the file data fork/stream.
BR
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