It appears my observations are correct
Quote:
In terms of Calibre changing the file, it can't (AFAIK) alter DRM'd amazon ebook files. It definitely can change metadata in non-DRM'd files from other sources. The key is re-converting the file once you make changes, even if you are just converting mobi to mobi. Then any changes you make will show up on your Kindle when you send over the file.
If I add a .mobi from FeedBooks or wherever and I change the cover, then I have to re-convert the file to get those changes to "stick" and change the actual file. Nothing changes in the actual ebook unless you re-convert.
Hope that makes sense - happy to clarify further. I use Calibre a lot!
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Source:
http://ask.metafilter.com/247089/How...or-a-mobi-file