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I think the main difference is that formats isn't stored between runs, but has to be populated by checking the actual files when used the first time, typically whenever calibre is started. That can be very slow. But then it is fast. Approximate_formats are stored in the database and doesn't cause any delay when starting calibre.
Both are fast to use.
Last edited by Adoby; 01-02-2014 at 11:55 AM.
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