Quote:
Originally Posted by unboggling
My first solution was to convert all ISBN10s to ISBN13s, for the sake of consistency.
A couple years later I realized I didn't care about ISBNs at all, and I stopped making sure I have good ISBNs. After initial metadata download having an ISBN is useless to me. ISBN10s, ISBN13s, no ISBN: why worry about it at all?
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Older books don't have ISBN-13 numbers even though Calibre manages to find them somehow since they were added to some books by publishers.
Problem is that if you open an older book, there is no ISBN-13 in it… only ISBN-10.
And I have problem with Calibre replacing data arbitrarily and not supporting ISO standard which specifies both ISBN-10 and ISBN-13 as standards.