What is the most DVDs you have?
Haven't counted in a while, but I'd say I have around 300-500. Mostly old 1950's TV shows and obscure European horror movies. Lots of Milla Jovovich movies and science fiction classics as well.
How can I grab data dvds hd dvds video dvds into a blank dvdv disc?
You can use DVD Copier
Are most blu-ray players able to play dvds an cds?
Maybe buy one and find out.
Can most blue ray players able to play dvds and cds?
No, it cannot it is not video game compatible.
A Blu-ray burner will most likely record both CDs and DVDs?
Just as a player like the PS3 has the capability to play the DVDs and Cds along with the Blue Ray discs and a DVD writer can also write Cds