Can't delete semi transparent folder

I have two semi-transparent or translucent huge folder, 70GB which I couldn’t delete despite restarted the MyBook Live Duo 6TB. I couldn’t browse the content of the folders. I am on Mountain Lion.

Hi, do you know what time of content is saved on those folders? What message do you see when you try to delete them? 

Login with SSH and do

rm -rRf /path/to/folder