The video store DVDs are pressed much like an old vinyl record. That is the only sort of DVD guaranteed to be playable in all DVD players. Blank, they are totally unusable and unburnable, just a cheap plastic mirror.
The recordable DVDs are a totally different design and constructed with different optical performance. They are only guaranteed to work with the DVD drive on the PC that burned them.
Newer DVD players have extra high performance laser optics plus a variety of firmware capabilities in the hope they'll be able to play recordable DVDs as well as the pressed DVDS. Some do better than others.
Fav quote - "Experience is whatcha don't get 'till ya don't need it no more."
System - Athlon 1.4GHz, Win98, Hauppauge PVR250 receiver and compressor.
Software -Magix Movie Edit Pro 10, Nero 6 + NeroVision Express, Moho 4.61, PSP 8.1, Bryce, Quicktime 6.52 pro, Goldwave 5, DVD-Lab.
Cameras - Panasonic GS9, Canon ES8400V, Canon EOS D20 and Canon A70