Disc modes

I 've recently purchased DVD +R 8x media
On packaging it states 4hours EP mode- 2hours SP mode.
Could someone pleases explain this to me and how to change modes
thank you ckikka

I think that is refering to use in a stand alone DVD recorder, much like the way you can turn a 3 hour video cassette into a 6 hour one in a VCR that can record using long play.

Man, I can not stand those labels… Just made to appease most of the public, who doesn’t know about varying bitrates or anything of the sort, relating it to a VCR. Or maybe there’s some standalone recorder standards conspiracy I don’t know about. Maybe that’s it.