"Dvorak proponents claim the Dvorak layout uses less finger motion, increases typing rate, and reduces errors compared to the standard QWERTY keyboard. This reduction in finger distance traveled is claimed to permit faster rates of typing while reducing repetitive strain injuries, though this has been called into question.
Although the Dvorak Simplified Keyboard (DSK) has failed to replace the QWERTY keyboard, most major modern operating systems (such as Windows, OS X, Linux, Android, iOS (via a third-party keyboard), and BSD) allow a user to switch to the Dvorak layout. Currently BlackBerry 10 and Windows Phone, do not support a system wide touchscreen dvorak keyboard."