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New Kindle e-readers no longer appear on computers
(goodereader.com)
This is a most excellent place for technology news and articles.
Pretty minor as long as your computer's OS supports MTP, which most do, except for MacOS. If you're a Mac user, you'll need 3rd party software like Calibre or Android File Transfer for it to show up, but if you're the kind of person who's transferring books to and from your Kindle over USB, you're probably already using Calibre anyway.