anyone backed up ps2 dvd with plextor px-708uf

[tgimike]

I need your help guys,
My burner is a plextor px-708uf external via usb2.
I have tried alcohol 120% and record now dx both successfully burnt the media but it wont play. I have tried three types of media including verbatim which i Know works on my ps2.
Backup films play ok.
The ps2 is version 4 with messiah 2.

The bin is rapidly filling with damn coasters!