burning dvds....

[Fallen]

hi,

i bought myself some dvd+rw's intending to burn some video files onto it, they're a 4.7gb capacity, and on the box states 120 minutes of video.
my laptop came with cyberlink power2go and i used that to burn the files on, but i can only burn 1 on each disc as the power2go says the disc has a capacity of 75 mins (each video file is just under 45 minutes long).
also, i was given some dvd+rw's of the same capacity but a different brand, that were able to hold at least 4 video files of around the same length.
how can i fit this amount on? is it the format i burn the files onto the disc with? is it the burning software i'm using?

please help as im going to have to use about 10 discs instead of 3/4.....

thanks