Explosive Labs has made a review about Plextor's External USB 2.0 PlexWriter PX-W4012TU,
This drive writes at 40x , rewrites at 12x and reads at 40x speed :
Typically, there has been a race to introduce the best and most advanced computing solutions. CD-RW drives are no exception. Based in Silicon Valley, Plextor has made a name for itself in performance and CD solutions. While there are quite a few companies offering CD-RW drives, Plextor is definitely one of the big boys in the game, being in the top five if not top three. At the time of this review, Plextor's external 48x (PX-W4824TU) had just come out. This leads me to expect full maturity. Hopefully, the companies specializing in CD technology will shift more to the DVD area. Though the DVD solution is still in its early stage, it shows great promise and probably will be used as much as CD-RW, as soon as it becomes cheaper.