Quote:
Originally Posted by peterdanckwerts
I've just converted an ePub to mobi. When I try to change the ISBN for the mobi file, Calibre changes the ISBN for the ePub as well. This isn't actually a problem as I still have the original ePub, but surely Calibre shouldn't do it. The ISBN should be different for each format, just as a hardback book has a different one from a paperback.
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Calibre has "books" and "formats" for that book. Each book can have a single ISBN, but multiple formats. If you want different ISBNs for your different formats, you'll have to create separate records and treat each format as a distinct book.