Businesses are very concerned with the medium on which their digital information is stored. The medium has a direct impact on their overhead cost to protect and preserve their digital information from external threats and hardware and software malfunctions. Expandability is another concern. Adding more digital storage should not wreck your Quarterly Report. The most common storage medium today is the hard drive. Unfortunately, the hard drive has several failure modes that can render retrieving the digital information very difficult to impossible. Fortunately, there are several methods to improve the survivability of digital information, but at a price.