The DVD burners in the iMac (8X write speed for DVD±R) and the Mac Pro (16X write speed for DVD±R) aren't the fastest on the market. There's actually a mechanism created by Samsung that can write DVD±R at 20X, and it's found in OWC's Mercury Pro DVD-/+RW Samsung Super Writemaster 20X External DVD burner.
While 20X DVD media isn't readily available, the Mercury Pro can burn certain 16X DVD±R media at 20X; not all 16X DVD±R media can handle the 20X speed. The Mercury Pro also adds LightScribe to the mix, a feature that allows you to etch a monochrome label onto your discs. The catch is that it can take some time to complete the etching process--up to half an hour--and you can only etch labels onto LightScribe-compatible media. According to OWC, LightScribe in the Mercury Pro works only when the drive is connected to your Mac via USB.















