Quote:
Originally Posted by finalgirlfall
someone on the Fire Toolbox forum suggested copying the books to my desired folder using file explorer (see here). that worked(!!!), which suggests to me that the issue is not something with my Fire, or Amazon devices in general, but instead--maybe--with the way Calibre as a program sends books to devices. food for thought!
thank you all for trying to help!!! :-)
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Nope! You are not the only Fire user that also uses Calibre. (there are MILLIONS of Calibre users and some of them have Fires) Only a few have issues, which suggests those (and You) have a combination of other things in play.
Many years ago, My Astak EZReader hated Intel USB2 enhanced driver. I could disable that mode or, as I did, installed a USB 1.0 card (so I could keep the performance on USB2 for other stuff).
Tracking it down was fun

, I happened to try on a friends system (demonstrating the issue) and it did not fault

, turns out, theirs did not use Intel (I had 3 computers I tried with this issue. All were Intel USB

)