Modern people can no longer imagine their life without a computer. Every day the amount of information that we entrust to our electronic friend is growing. However, we should not forget that no one can absolutely guarantee the safety of the data on the computer. There are a great many reasons why they can be lost or damaged: carelessness and erroneous actions of users, hardware failures, sudden power outages, malware activity, unstable operation of the operating system, etc. After data loss, many fall into despair, believing that it is impossible to restore them. However, this is far from true; moreover, as practice shows, in most cases it is possible to restore lost information. The most important thing is not to panic: one of the most common mistakes is that users, having discovered the loss or corruption of data, begin to take a lot of rash actions, only thereby aggravating an already difficult situation.