Who can explain me which type DVD in Costco (-R or +R) is better? Somebody told me that -R is good for burning DVD movies and compatible for home DVD players while +R is good for computer data. I bought -R already (100 pack) but would like to exchange +R if +R is better. I will exchange half of my -R to your +R if you bought +R 100 pack from Costoco so we can have half +R and half -R.