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Superfluous *.SDR Folders
I believe the reason there are two *.sdr folders for every book is because one is created by Calibre when the book is sideloaded onto the Kindle, and the second is created by the Kindle when the book is opened. Prior to sometime late '17 / early '18, Kindle would use the *.sdr folder created by Calibre, even though it was buried in the folder hierarchy. A change in the Kindle OS has blinded Kindle to the existence of the Calibre-created *.sdr folder, so it creates another when the book is opened. This makes the Calibre-created *.sdr folder superfluous, and it can be deleted at any time. Not sure why Calibre continues to create a folder that will not be used?
The above statements are my belief, based on experience and small indications such as file creation dates, etc. They are not fact, based on actual knowledge of Calibre and Kindle OS. Perhaps someone with actual knowledge can chime in and let us know the truth of the matter.
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