What's the difference between DVD and Bluray?

i recorded Heroes on a dvd+rw for a friend and she couldn't use it in her regular dvd player. i wonder if i bought dvd-r or dvd+r if she could use them in her regular dvd player after i burn them on my dvr also what is the difference in dvd-r and dvd...

also does any one know when a blu ray dvd recorder will come out, when a blu ray dvd rw will come out, if there is a hd dvd recorder out there and if there is a hd dvd rw out there. ...show more

I have heard that -R is readable in most DVD players and that +R's last longer, etc etc But what I want to know is.... What is the difference as far as physical properties on the disk? Do they use different dye? pits and lans, etc etc....? And WHY is...

Can dvd players read DVD+R or mostly DVD-R? My DVD burner can do both but i want to know which media to use before i start to record movies so they can play on my dvd player. Thanks.

i have a normal DVD player and a Laptop which plays DVD's but i wondering what the difference is between the HD dvd's? and will it play in a normal DVD player?

what is the actual difference, if i have a dvd camcorder can it record directly onto regular sized dvds and pop straight into the dvd player right? and how does mini dvd work and the hard drive.. i want the easiest possible! help

What is the difference between BluRay and DVD? I have systems that can run both and I was just wondering what the difference was and what one is better. Thanx

ok, so i have been making dvds off my computer. last time i bought DVD-RW and all my movies turned out great. But this time i wasn't really paying attention at the store and bought DVD-R. so now every time i burn a movie on to these dvds and went to...

People say that upgrading from DVD to Bluray on plasma TV will not make a huge difference, but for LCD it will. Is this true?