See below for the burning quality with firmware B7P9 and media is:

                            Media Information                            
Region information                                    N/A not a DVD-VIDEO
Media code/Manufacturer ID                                    CMC MAG F01
Media Product Revision Number                                         00h
Format Type                                                      UDF 1.02
Volume Name                                               WEST_WING_S2_D6
Application id                                                           
Implementation id                                              DVD Shrink
Recording Date/Time (mm/dd/yyyy)                      11/ 9/2004 19:36:24
Format Capacity                                            4.36GB(4.68GB)
Book Type                                                         DVD-ROM
Media Type                                                          DVD+R
Manufacturer Rated Speed                                    4.0x 5540KBps
Data area starting sector                                          30000h
Data area end sector                                              22E1BFh
Linear Density                                                0.267um/bit
Track Density                                                0.74um/track
Number of Layers                                                        1
                                                                         
                           Complete Media Code                           
00000000 08 02 00 00 01 0F 02 00 00 03 00 00 00 25 E1 BF .............%..
00000010 00 00 00 00 00 00 00 43 4D 43 20 4D 41 47 00 46 .......CMC MAG.F
00000020 30 31 00 38 23 54 37 10 02 48 71 02 8C 69 16 16 01.8#T7..Hq..i..
00000030 0B 0B 0A 0A 01 1D 1E 0C 0C 12 12 01 00 00 00 00 ................