Packard Bell's use the NEC DVD reWriters that are usually DVD-R9 Compatible (Dual Layer). If i had my camera i'd show you exactly what he's on about.
Next to the fold down drive bay (slighty above it) next to the spring loaded "doors" to the drives it has white writing saying "DVD RW R9"
I have one myself
And it's most likely the NEC ND-3500AG model, as PB keep using this fantastic little burner.