Logitec is also releasing DVD Multi writer drives based on Panasonic mechanism that can write to DVD-R, DVD-RW, and DVD-RAM. There are already Hitachi, Panasonic (Matsushita), Toshiba, and LG (jointly with Hitachi) that make DVD Multi. Samsung will soon produce DVD Multi drives as well.
Use this link if you don't have a better tool to read the Japanese-language articles.
http://pc.watch.impress.co.jp/docs/2002/1218/logitec.htm
Logitec LDR-N21AK
Logitec LDR-N21FU2
Logitec LDR-N21F