Dvd Recorders

[nachovx]

DVDR is a generic expression for DVD Recordable media and does not default to + or -

Unless you're the sort of person who calls all cola drinks Coke and all burgers McDonald's

No stirring - just a fact.

[Steven]

Yes, I fully agree.
Any reputable supplier would ask "is that +R or -R sir?" if you were to simply ask for DVDR.