I've got a nec nd2500a (non dual layer).

However a mate has just got the LG 4120BA, which apart from doing dual layer, also writes dvd+r at 12x, dvd-r at 8x and dvd-/+rw at 4x.

yummie
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Andy MK2a 60GB Amber 040103916 32mb/Light Kit MK2a 50GB Amber 030102560 32mb