I keep my banking, addresses, numbers, journals and a lot of important personal informations on my computers, enough to create another me. 1. Before donating, how can I ensure that my personal informations can't be retrieved after I deleted it. You hear how people say that informations are never deleted even though you trashed it. 2. Before the trash man picks it up. This is different than above I suppose because I don't care if it's still functioning. How can I kill it to make sure no one can retrieve my personal stuffs?