[DoodleBird]

I am quite new to Calibre, I started using it two or three weeks ago. I created my library and began adding books to it one by one (because my current/previous library is a mess). Today I open Calibre and am welcomed with a message about being unable to locate my Calibre Library file/database.

Okay, good thing I remember where I saved it. Nope, it's gone, like it vanished. I checked the trash just in case, not there.

So the thing is I had the library saved on an external hard drive (to access between computers), my hard drive is password locked and it locks automatically when the laptop sleeps, so I get this message when I open the Calibre and forget to unlock the drive first. But each time it was a simple matter of pointing Calibre back to the library folder. So how could my entire Calibre Library just disappear like this?

Note: I did back up all of the books, so it isn't a question about retrieving the book files, but rather how to get the library database back and maybe why it suddenly vanished in the first place. No one else has access to my hard drive so it isn't like some one got on here and accidentally deleted something.

Thanks for any help, it is much appreciated