Sorry for my english.
I bring you an information.
My 451S has killed two DVD+RW 4x Philips.
Region information N/A not a DVD-VIDEO
Media code/Manufacturer ID RICOHJPNW11
Format Capacity 4.38GB(4.70GB)
Book Type DVD+RW
Media Type DVD+RW
Media Id Code Speed 4.0x 5540KBps
Available Write Descriptor CLV 4.0x 5540KBps
Available Write Descriptor CLV 2.4x 3324KBps
BG Format Status Suspended
Data area starting sector 30000h
Data area end sector 23053Fh
Linear Density 0.267um/bit
Track Density 0.74um/track
Number of Layers
First with firmware GSB4.
Second with firmware GSB6.
Impossible to formatted.
They worked very well on my 411S that i have sold to my friend.
All my others dvd-r and dvd+r and dvd+rw Sony 2.4x works well on my 451S.
I think, it’s a problem of incompatibility with my Philips dvd+rw at 4x.