This is my understanding of what the different identifiers mean. I am curious to see other's posts.
asin: I believe that this is deprecated in calibre, replaced by "amazon".
amazon: The ASIN value for a book at amazon.com. There are variants for other other Amazon websites. For example amazon_uk refers to a book at amazon.co.uk.
mobi-asin: The ASIN value contained within an e-book file. This includes the "fake" ASIN values generated by calibre that are actually UUIDs.
Last edited by jhowell; 07-25-2020 at 08:32 AM.
Reason: typo
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