When your computer suddenly stops working normally, chances are you will need hard drive data recovery. What kind of recovery you need will depend on the type of failure in your PC. For a simple operating system failure, crashed drive recovery programs are available that can boot your PC, giving you access to rescue all of the files contained within. For a greater issue, when your hard drive is mechanically or electronically damaged, you will need to send the unit off to a service lab for disassembly, repair and recovery. Most hard drive recovery situations are just simple logic crashes of the operating system though.