Do you need the disc of World of Warcraft to use a 60 day card

Once you buy the game and upgrade your account to show the game as being added then all you have to do is down load the game from Blizzard's official web site you no longer will need the disc as long as your account has been upgraded. If your playing on a free trial and want to add a 60 day game card you will need to but the game 1st sense free trial can not be upgraded without purchasing the game.