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Originally Posted by paulfiera
What does Check Library really do?
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It checks your library.
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There are 2 checkboxes (fixable) and by checking them and running "Fix marked" nothing happens.
I know there are a couple of books missing covers. Shouldn't it list the books with missing covers?
There are also Extra book formats. Some books in ePub and LIT.
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Fix library does not check for missing covers, because that is not an error. It does check for covers that the database thinks are there but are not (missing covers), and covers that are there that the database doesn't know about (extra covers). Both of these can be fixed without risk, which is why the fixable option is there. However, nothing will be fixed if there isn't anything in these two categories.
As for extra book formats, I assume that you know about them because check_library told you (they aren't on the screenshot). You have three choices:
- ignore them.
- delete them. You can do this directly from check_library by selecting the files ('check' them) and then pressing 'delete marked'.
- re-add them. To do this, you should move the 'extra' format file out of the library, then use edit metadata to re-add the format.
Your question might be 'where did these extra formats come from?'. The answer is 'I don't know, and can't know.' Usually they arrive because of people messing around within calibre's folder structure, but there could be other reasons. For example, I can see it happening in some application crash circumstances. It is possible that there is some lurking bug somewhere, but as time passes this is becoming less and less likely.