Besides the new features, TechTool Pro 4 also contains updated versionsof its time-tested repair and diagnostic features. Like volume repairand data recovery, which can save the most important element of yourcomputer: your data. Like its predecessor, TechTool Pro 4 can also testsall of the critical hardware on your system like the CPU, memory,controllers and even the power supply that feeds all of these devices.The program can also check other important aspects of your system likeinternet connections, network and even some third-party externalperipherals.