What´s wrong?

[Reverend_Snakeb]

Recently i bought a DVD burner (NEC ND-1300 DVD+-R/RW)
and some verbatim datalifeplus DVD-R.
I used Nero to Burn Image i prepared earlier (devil may cry),
and everything seemed to work out just fine.
However, when i placed the backup in my PS2
(SCPH-30004 w Messiah) it wouldn´t load, recognise the disc
or anything.
This machine has no problem playing backups ripped onto CD-r,
so this left me a bit baffled.
All in all I tried two different images (castlevania LOI & Devil may cry), on three different progs (Nero, discjuggler and alcohol 120%) and the reults were the same: burning the DVD-R is fine,
but getting the PS2 to recognize it is a total and utter failure.
I´m thinking that i must be doing some horrible newbie mistake and would be very gratefull if someone could give me some advice/solution.

Thanks!