Quote:
Originally Posted by sfritz
I don't know what is the difference between the types, but I am happy with the old one.
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Using "Both" bundles two copies of the book together, one in MOBI format and the other one in the newer AZW3 format. This bundle is intended to be a kind of universal file, which can be understood both by older Kindles (who only know MOBI) and the newer ones (who know MOBI and AZW3).
Once you upload the file to Amazon, if your Kindle supports AZW3 (which is your case), it will download the AZW3 version, which looks more like a real book. On older kindles, the MOBI version is downloaded. At the risk of oversimplifying, MOBI is a bit like a .TXT file, while AZW3 is more like a web page (HTML).
The problem here is that Amazon messes up the covers in the AZW3 version. So if your kindle downloads the AZW3 version, it doesn't get the covers. If it downloads the MOBI version, the covers are fine. So it's a trade-off between the covers and the layout.
In the end, if you're satisfied with MOBI then there's really no need to mess around with other formats!
