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Yes, they can, but sometimes it requires a FW upgrade in order NOT to fry their burner. Pioneer had that kind of issues.
Probably 2x are more expensive, because they are obsolete (no brand today ships 2x discs) and at the time of their production the cost was higher than today. I can remember when TDK dvd-r 2x was costing 13€ on a local shop.
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