When you install Calibre you define a directory for it, when it adds a book, it creates a directory inside the directory you have defined with the author's name. So when you delete a book (or file) in Calibre it only removes it from Calibre's directory.
also Hi everyone! this is my first post, I ordered a Sony psr 505 which I believe might arrive tomorrow at my doorstep. I live in Portugal and I found out yesterday I can't buy an ebook in the Sony store
When I get it in my hands and use it a bit, I'll post some more.
Great forum here (one of the reasons I decided to buy an ebook reader)