The difference between a DVD+RW and a DVD-RW disc?

Can I copy photos from my computer onto a DVD-R disk?

I know 3gp is accepted on mobile, thus I converted my DVD videos to 3gp format for watching on my mobile. However, both the picture and sound quality are bad and low-quality. Then how do people watch HD videos on their phones? What is the best format for smartphones?

I have copied Audio_TS and Video_TS folders to my local drive, how can I burn these folder to another blank DVD disc and make it looks like the same DVD I copied from?

So I am wondering if there is a way to leave movies from a DVD onto your computer. So when I take out the disc, the movie doesnt disappear as well.

I have a lot of dvds and bluray disk movies at hand.What troubles me most is that some disks were damaged or lost because of many factors. I don't want to be the situation any more.So I like to know any useful ideas about backup them on my computer.Any suggestions will be of great help.

I sometimes burn a DVD myself and I usually simply tell people I do not do that or know how. Now I have two full length movie formated as mp4 and avi. I just want to know how to burn this two format movies into dvd available.I use to use nero but feel somewhat complex. So can you tell me what is the best dvd burning software under my windows 7 computer? It should be easy to operate for me.

Ok so which video format do you think or know will look best on a dvd player.
DVD NTSC video movie,
Mpeg 1 movie, or
Mpeg 2 movie?

I downloaded the 5th season of The Big Bang Theory to my pc and I know how to save the video file on a disk (Im Using DVD Flick). But I dont have any blank disks and know little about this. They should be supported by DVD Player and my XBOX 360. What blank DVD should I buy?