It seems that Plextor is trying to regain leadership (actualy for me is a leader) in the field of optical units had a few years ago, launching the external BD-RW PX-LB950UE fastest Blu-Ray burner on the market at this time. He can write BD-R at speeds up to 12x, meaning 54 MB / sec.
And to achieve such performances are connected to the PC via USB 3.0 or eSATA, and has an 8 MB buffer. It is equipped with an anti-vibration system, to stabilize the disc, and a special casing that directs airflow to the engine to keep it as cool and reliable.
It's a BD-DL at 8x, a BD-RW at 2x, and read all be done at 8x maximum. Of course, he knows and write DVDs, but only 8x (DVD-RAM except that goes up to 12x), and read them at 16x. And CDs are written and rewritten at 24x to 48x. And also features LightScribe technology.
Plextor PX-225 * 163 * LB950UE measuring 52 mm, weighs about 1.2 pounds and comes with a price of $ 240.