I posted about this very thing a few months ago:
https://www.mobileread.com/forums/sh...87#post3666087
In my limited testing, I discovered that these directories are created if you connect the kindle to USB while a book is open. Actually, it's created after disconnecting the Kindle:
- Open a book
- Connect Kindle to Computer or put to sleep*
- Disconnect Kindle or wake from sleep* (Directory is created at this point, I assume)
- Connect Kindle to computer to see new directory in Documents
I never see a new directory created when I open a book, close the book and then connect to my computer or put to sleep* while on the home screen.
I still haven't divined the purpose of these directories.
This is with my PW3 and a PW2.
*ETA: I've also noticed that a directory is created if the Kindle goes to sleep with a book open.