[CentOS] installing centOS5.5

For burning the image on DVD I found 2 iso files:
CentOS-5.5-x86_64-bin-DVD-1of2.iso
CentOS-5.5-x86_64-bin-DVD-2of2.iso
I found out that the first one is 4.1GB and the second one is 412MB. Do I
have to burn the first one on 1 DVD and the second one on another DVD?
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