[Adoby]

If you keep *all* your books in Calibre, you don't have to bother with checksums. You use Calibre to check for duplications. And you can fix metadata, covers and all other stuff.

Instead use the plugin "Find Duplicates" to look for binary matches, before(!) you do a bulk metadata lookup. And remove duplicated books BEFORE you change the metadata. That way you never risk adding the same book twice.

After successful addition of metadata you can do another search for duplications, this time for the same book in different editions or in different formats. Sometimes you may wish to keep the duplicates, sometimes not. Calibre allows you to decide which.

If you do things like this you can use Calibre to maintain your library of books. But you have to give up the checksums. I'm still not clear about why the checksums are so very important to you?

Also you have to give up your sorted folders and any structure you have now. Instead you can use the features in Calibre to locate different books. Or even use the Content Server to browse you library using metadata like tags.

If you wish you can at any time "dump" the whole library to a folder tree, using metadata to create the tree structure and organize the tree as you like.

---

There also are some utilities out there that seems to do exactly what you want. Like MP3Tag. Not always free, though...

If the author and book title isn't in the metadata, then it won't work. Not if the metadata is wrong, either. Or perhaps modified by Calibre earlier, by someone else.

Google "epub metadata rename" or "pdf metadata rename" to find some examples.