Quote:
Originally Posted by wzyboy
I could not find code about using the calibre UUID as ASIN... 
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The kindle requires the name of the thumbnail file to be in a specific format that includes a cdetype and asin that match the metadata contained within the book.
Any unique string will do for a fake asin. calibre uses its own book uuid and the KFX Output plugin generates a random 32 character string instead.
There is a slight advantage to using the calibre uuid that I hadn't considered previously. If you convert and copy the same book to a kindle multiple times it will retain the same asin and so it will overwrite the thumbnail image, instead of creating a new one each time.