They are a form of re-writeable dvd that is supposed to be re-recordable for thousands of times... the higher cost Panasonic dvd Recorders also come with Hard drives making editing easier...but panasonics only record to dvd-r and rams, there are brands that record to Rw's and the +R formats as well.jeansice said:Thanks for the reply. What are DVD RAM's? I am pretty non-techy when it comes to this stuff.