You may feel these symptoms first in your feet and then possibly in your shins: 1  Numbness, tingling and pain. 2  Unsteady when standing, walking. 3  Muscle weakness (including weak ankles) or cramps.
720HD is 1280 x 720 pixels per frame. The highest resolution that the DVD format can support is 720 x 480 pixels per frame for NTSC (or 720 x 576 pixels per frame for PAL), which is at best only 37.5% of the resolution of 720HD.
Essentially, each is a recordable variation of the DVD format. They allow the recording of audio, video, data, etc. on DVD discs. DVD-R is a one-time recordable disc, similar to a CD-R. If used to record video, it should be playable on most DVD players. DVD-RAM, DVD-RW and DVD+RW are competing, rewriteable DVD formats. Each is backed by a group of major electronics manufacturers.