a9我不清楚。
我刚刚买了R＋
简直是太完美了，刻出的dvd被dvdinfopro
识别为：

Region information N/A not a DVD-VIDEO
Media code/Manufacturer ID N/A Pressed DVD
Format Type UDF 1.02
Volume Name
Application id
Implementation id AHEAD Nero
Recording Date/Time (mm/dd/yyyy) 1/23/2005 3:49:58
Format Capacity 0.00GB(0.00GB)
Book Type DVD-ROM
Media Type DVD-ROM
Data area starting sector 30000h
Data area end sector 46Fh
Linear Density 0.267um/bit
Track Density 0.74um/track
Number of Layers 1

Complete Media Code