I have been storing some private data (mostly documents) in CDs and DVDs for a long time. Now they have become obsolete and unnecessary, so I am going to throw them all to garbage can.
What I want to do is to make them unreadable by an easy method. I don't want to scrape them one by one, or to burn them all. I don't need to thoroughly exterminate the data as there are no any governmental secret files in them; I just want to make sure when somebody finds one in the garbage piles, he shouldn't be able to read the data by an optical disk drive. So I need an easy and non-time-consuming method.