RingCube Technologies has raised $12 million in a second round of funding, the company said Tuesday. Mountain View, California-based RingCube would like to change computing habits by making computers truly portable with its MojoPac software. MojoPac allows users to transfer all applications from their main computer to any portable storage device, be it a digital music player or a flash memory stick. MojoPac is just one of many options for people who want access to their computers without actually taking them along—from souped-up UBS devices to on-demand software that’s stored on the Internet. The company said it already has tens...