[sikm]

I've been transferring books this way for a long time now and HAD ALWAYS ASSUMED that it worked. In fact it hadn't. The books were in the library folder yes but my assumption that they had automatically been added to Calibre was incorrect. So I Added Books - From folders and sub folders - and selected the library folder. The accumulated books from whenever were added; all 1905 of them.

So, copying books into the library folder does not add them to Calibre you have to add them manually. Lesson learnt, maybe it was only me or maybe this will help someone else.

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I have a Calibre library on one Win11 PC which I regularly copy onto a USB stick and take to another Win11 PC. Both PCs have an identical Calibre setup, same library folder on both PCs.

On PC2 I delete the old contents of the library and copy the contents from PC1. I've done this for a few years now without any problems. The result is that the contents of both Calibres are the same. Or should be....

Just lately however I've discovered that some of the books - coincidentally the latest additions? - which show in Calibre PC1 do not show in Calibre PC2. The books in question are there, I've checked and double checked the folder.

I initially thought it might have something to do with a book limit (only 768 books in the library) but all's well on PC1 but not on PC2.

Both copies of Calibre are the latest version and I've run library maintenance which found nothing untoward.

I'm at a complete loss and would welcome any suggestions.