Hi, I'm considering upgrading to a dvd recorder but don't know much about them. Like what's the difference between dvd-ram, dvd +r, dvd-r, dvd+rw, dvd-rw and xyz, etc..... How long do these dvd's record for? I seem to understand that if you get a player with one format(dvd-ram for example) that you can't use any of the other formats. Can anyone provide some info on all this confusing stuff or a link to a previous discussion or site that explains this all in plain english? Thanks in advance.