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Kovid,
In reading the post of the tests done by johan1fs at Amazon, I got the impression that if you place a collections.json file at the root of your kindle file system, and then restart the kindle, the collections are rebuilt from the contents of the json file. Note that whispernet has to be off or else the json file will be overwritten by the copy on the Amazon archive before the rebuild is done.
This is clumsy I admit, and you are probably right that there is no convenient way to create a collection from the Calibre side. Displaying the collections works for me.
I wasn't sure where the asin numbers in the book titles came from -- it seems that you have found the asin's are only in the filesystem names (and only for Amazon books). I still wonder what happens to my collections if I change the book title metadata on Calibre to remove the asin's? Will this break collections on the kindle side -- as the collections expect the asin's to be present.
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