Hi Itimpi.
The operation has been done one shot.
I don't know what to provide as additional information : once all books selected, I used the feature 'Save to disk in unique folder' (approx. translation : I use the french version), this folder is on a mobile drive that I plugged into the other machine.
Started Calibre on this second machine and chose 'add books (each file is a different book)', this created a new library on local HDD, and when I had for each book on my mobile drive 3 files including systematically an opf one, non all of them have been re-created on the new library.
I could live without these files, but when I try to use the feature 'Send to device', from this new library to My Ipad, it runs only for books that own in their folder a separate metadata file.
When this file (.opf) is missing, the copy stops with error msg 'missing OPF package file'.
I don't think I'm doing anything exotic ...
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