Which version of dvd disks?

Posted:
in Genius Bar edited January 2014
Ok I have an 800mghz 17" iMac and I am looking at some blank dvd-r disks but they say they are version 2.0. Are these the right type for my superdrive that writes at 2x or are these 4x disks? (I heard burning a 4x disk in the 2x drive makes it run at 1x is this true?)
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