Quote:
Originally Posted by lisposter
Is that mean I just pay no attention to this id number, and just leave it alone？
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Yes. Those files belong to Calibre and Calibre needs this id number.
Consider directory/folder called "Calibre Library" closed database that is managed by Calibre program. To make system very robust in case some files (or the main database file) gets damaged, everything is kept in nicely named and separated files. For normal operation you do not need touch those files.
When you need to use files from Calibre, use function [right click on book] "Save to disk" and save the book to a directory of your choice.
You can configure EXACTLY what and how gets copied to this export directory. Plus files are updated with the the most recent metadata when they are copied.
Usually you just connect your device to PC with Calibre running and you can send files to your device. So there is no need to access files. Here you can also configure everything.