 How to recover data from a RAID array after a controller failure? First of all, let's explore the process of creating a RAID system. In order to access the controller's bias after hardware initialization, you should press the key shortcut Ctrl A while the computer is booting. After that, you need to initialize the disks. After initialization, we can get down to business. When the controller fails, so connect the hard disks to a Windows computer. The operating system will display them as raw, download, install and run. Setment RAID recovery. Try fast scan first. When it's over, the program will display the results in the right side of the window.