dvd-+rw?

[unkoman]

what's the difference between dvd-r, dvd-rw and dvd+r and dvd+rw?

[RJ]

R=recordable, RW=rewritable

The + format offers Mount Rainier capability and lossless linking capability, and so offering the DVD+VR capability. Better for standalone video recorders, but also on the PC you can use the advantages.
Also + has higher writing speeds, 4x DVD+R and 4x DVD+RW, comparing to 4x DVD-R and 2x DVD-RW.

RJ