SATA Hard Drives vs Cerebrum

When you emptied your Recycle Bin,you thought all the files are going to be erased permanently.No.Your hard drive will still store some of its pieces until it is rewritten with the new data.Considering how large our hard drive are these days,do you think what you had deleted pass two years ago are really erased?Sadly no,it still can be retrieved.Hard drive is just an example showing part of how the brain works.So,do you think you can easily forget significant things that happened years ago,eventhough it is negative?

Random thoughts.Suddenly this just pops out of my mind when I'm eating my breakfast xD