As the press interviews last year with some South Korean media, LG now has a DVD Multi writer that can also write to DVD+R and DVD+RW. And it is a 4x DVD writer (probably with 4x DVD-R and 4x DVD+R only though.)

Samsung will soon announce something very similar and both of them will produce more DVD writers than they have ever produced CD writers. Until now, the two companies have only produced DVD-RAM, DVD-RAM/DVD-R, and DVD-RAM/DVD-R/DVD-RW writers.

http://club.cdfreaks.com/showthread.php?s=&threadid=58354