Maintaining privacy in the era of digital information requires work on a number of fronts, whether fending off spyware, protecting important files with encryption or configuring a Wi-Fi hot spot to keep interlopers off a wireless network. One basic privacy measure, however, is easily overlooked: proper data destruction. Deleting confidential data completely is essential when donating or selling old computers, and it can also help maintain privacy on computers that may end up lost or stolen. And for businesses looking for ways to comply with the security requirements of laws like the Sarbanes-Oxley Act, a sound policy on data control...