> SD vs HD, is dependent upon who you ask. The CEA, which represents the TV makers, says that anything with at least 720 lines is HDTV, thus enabling 1024x768 to be called HDTV. ATSC, which develops broadcast standards, says that HDTV should be 720 or 1080 lines at 16:9 aspect ratio, which implies 1280x720 or 1920x1080.
But this post is a wonderful example of the sort of doubt Amazon will be very happy to have spread as a result of the ads.
The last time I looked at buying a movie in iTunes, the max resolution they sold was 720P.
iPad mini has 768 pixels, but the display is 4:3. It will not display 720 lines without distorting the video. Or cropping. To play 16:9, it will be displayed as 1024x576 with black bars at top and bottom. 576 happens to be SD PAL.