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The mobi format can take 3 or 4 times as many bytes as the epub format. And i am sure there are others examples as well. If one has a epub version and it has all the qualities of the mobi why not get rid of the mobi? (only create it as needed for export to mobi only devices). That would save a lot of space. i would guess that there are many such inequalities, this is only the most prominent.
There seems to be no provision in Calibre for deleting mobi IFF there is a epub. One can only delete mobi's - and that my be the only copy! Perhaps one can massively produce epub's, then delete mobi's?
greg
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