My Book Elite 1TB

I just purchased this 3 weeks ago and tranferred all my files over to it.  I was watching movies off it through my WB Media Live and turned it off before I went to work.  Was gone for 5 hours, came back to turn on my media player and it wasn’t reading my HD.  Checked my HD and all my data is gone? My screen only has my name and doesn’t show how much space I have left.  When I hook it up to my desktop, it keeps asking me to format and i can’t because I have important files int here.  Any help will be greatly appreciated!

I have a similar problem, mine no longer let me access the HD, although show it’s connected, anyone knows why???