from what I understand, DVD-R was developed, and sony and a couple other companies didn't want to pay to licence it, so they created a similar-but-just-different-enough format called DVD+R. the +/- RW versions came shortly thereafter. There are no speed differences (fundamentally, some drives will do one or the other faster but that's just engineering) or capacity differences (both 4.7GB per disk, IIRC). Unlike what some people seem to think, + does not spin the opposite direction of -. (Yes, I had a customer about a year and a half ago that thought this.)
DVD-RAM is an older format that (IIRC) is better in some way, but I forget how.
+/- RW and -RAM are both read/write capable, +/- R are of course Read-only.
Double layer is any of the above formats (except -RAM, I think) that are just that, 2 layers of recording area instead of one. Obviously this doubles your capacity but not much else.
make sense? |
