According to an article written by AppAdvice editor A.T. Faust questions the possibility of a 7.85-inch iPad.
Rumors of a mini version of the iPad have been making the rounds for some time now.
However, late Apple CEO Steve Jobs was known to be disapproving of such a screen size for the tablet, insisting that a 10-inch display would be the minimum necessary for a good user interface.
However, Faust analyzes the rumor of an iPad Mini and believes that if Apple released such a tablet, it would necessarily feature a 7.85 inch screen.
For starters, he estimates that the points per inch (PPI) of an imaginary 7.85″ 1024×768 display would be 163 PPI, which is exactly the same resolution as pre-retina iPhone and iPod touch displays.
Apple’s recommended minimum size for tappable user interface elements is at 44 x 44 points, which is available for the original iPhone and the original iPad.
With such a density, Faust claims that any iPad app that was based on these guidelines wouldn’t go under the recommended 44 x 44 point (0.27 x 0.27 inches) on a 7.85″ mini version of the iPad.