DVD version

[DetroitBaseball]

On my blank DVDs, it says DVD-R version 2.1. What does this mean? On DVD+R it said 1.3. What do these mean?

 

[Webslinger]

On my blank DVDs, it says DVD-R version 2.1.
What does this mean?

http://www.dvdhs.com/usa.html

Regarding High-Speed Recording Disc Compatibility

The *DVD Forum established standards for high-speed recordable discs in August, 2002 (**DVD-R discs supporting 4x recording and **DVD-RW discs supporting 2x recording). Both high-speed DVD-R/RW disc standards cover current 1X recording capability and higher speed writing capability. (2X and 4X for DVD-R, 2X for RW).
As of Nov. 2003, the DVD Forum established high-speed recordable disc standards capable to support *** DVD-R 8x recording and *** DVD-RW 4x recording.
As of Sep. 2004, the DVD Forum established additionally new high-speed recordable disc standards capable to support **** DVD-R 16x recording and **** DVD-RW 6x recording.

* The DVD Forum is the worldwide organization made up from numerous participants who conduct research or engage in the DVD businesses and commit to foster the format.
** DVD-R for General Version 2.0 / 4X-SPEED DVD-R Revision 1.0
DVD-RW Version 1.1 / 2X-SPEED DVD-RW Revision 1.0
***
DVD-R for General Version 2.0 / 6X-SPEED DVD-R Revision 2.0
/ 8X-SPEED DVD-R Revision 3.0
DVD-RW Version 1.2 / 4X-Speed DVD-RW Revision 2.0
****
DVD-R for General Version 2.1 / 12X-Speed DVD-R Revision 5.0
/ 16X-Speed DVD-R Revision 6.0
DVD-RW Version 1.2 / 6X-Speed DVD-RW Revision 3.0

On DVD+R it said 1.3. What do these mean?

same sort of thing