[MrWriterReader]

I bought a new computer. At some point during the transition, the Calibre library lost quite a lot of the actual books, as it is telling me that there is no available format for the books, however, it has kept all the covers and metadata. I realise I will need to spend hours repairing the library, but I am finding it time consuming to find which books I have lost as the metadata still records a format (even though there is no book). Does anybody know of a faster way of finding the missing books?