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.
That means that a Blu-Ray high def image is six times the resolution of a DVD image. Itâs no surprise then that the Blu-Ray disk needs to have a higher capacity: a movie that encodes to 4GB in DVD resolution is going to be 24GB on the Blu-Ray disk.