first off, my computer right now is kind of old, so im upgrading some parts. and right now i have a cd read and write drive. thats it..no dvd drive or anything. so im planning on getting a DVD±R drive for it and im wondering, how would i know what type to get that is compatible with my motherboard? im new in the area of drives so im unfamiliar with this. also, how much would it cost at an average for a part like this?