THank you, I have done the firmware upload. THe discs are 16x certified Verbatim 'photo printable (white coated). I will burn another disc first before trying another spindle and report back tom you.
I have been able to complete a burned disk including validation,
log file:ImgBurn.log
_NEC_DVD_RW_ND-3550A_1.07_23-FEBRUARY-2010_22-04_MCC_03RG20_2x.ibg
However on playback on the computer I could not play the first title (1/2) as it jumped to play the second title (2/2).