DVD+ is a newer format that gives a slight, yet unoticable diffrence in definition. DVD- is the older format of the two it holds the same amount of space 4gb or 120min, and is still the current standard in dvd's. Now in dvd recorders pre-2002 most recorded in the - format however HP and Sony Dvd oem recorders in their PCs were DVD+ recordable only. DVD players it goes like this "most" dvd players pre 2003 only played back -R format. Now in 2006 all recorders do (+-) all players play (+-). But if you plan on bootlegging or sellign dvd's your best choice in format would be the -R.