As far as I know, the burner "communicates" with the disc, reading in the speeds that the disc itself supports. Perhaps, the reason why you can only write that particular disc at 2.4x speed instead of 2x is that you're using a different (lower quality?!) media... See
http://www.digitalfaq.com/media/dvdmedia.htm for a media quality guide.
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Joe Forster/STA
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