How to hack any cassette tape to RECORD over or to keep recordings for ever

How to hack any cassette tape to RECORD over even pre recorded ones or to stop and keep the recording if on a blank tape for ever. First find and put some paper or sticky tape so it covers the little holes in the top the cassette. When done if wanting to keep the recording remove the paper. If its a blank tape and you not want to record over by mistake snap the little bit of plastic on the top which is over the hole in the same place.