I am new to calibre and I also had the same question. However, this is still not clear to me. Suppose that I have two readers that support the same format, say epub, but differ for example in the size of the screen. Is the document I generate for one device different from the one I generate for the other device? If this is indeed the case, must I run the conversion twice? Can I have both versions of the file in my calibre library? For example I have a lot of books I would like to convert into epub, should I perform the conversion twice if I have, say, a Cybook Opus and a Sony Reader? And can I keep both versions in the library? Why does the conversion depend on the device, while the mobis and epubs that I buy appear to be independent of the device?
Thanks,
Alfredo
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