What Causes Data Loss

To loss data you must have stored the data in a storage device.
Storage devices are fragile and any form of mishandling, like dropping, banging can cause breakage of magnetic plates, or chips that store data. This mishandling can lead to data loss and if the damage is extensive recovery of any data from the devices can be impossible.

Working in areas where there are power fluctuation causes powers surges which can lead to electrical shocks. This can lead to damaging the printed circuit board of the disks or even the system itself. This causes physical failure on the disks and can lead to crashes.

Human error can be a big contribution of data loss. Switching system directly from the power button can lead to loss of information as the system stops all processes immediately. Human error can lead to formatting of the disk drive or erroneously deletion of important key files used by the system to boot up. Interfering with the registry of the system can lead to changing the system setting which can lead to instability of the system. Freezing, hanging among others are from unstable systems.
In places where natural disasters are frequent, data can be lost in great volumes. In a case of a flood, fire or earthquake can lead to wiping all the systems braking down communication lines and data cables. The amount of data lost during a disaster is 100%.

Viruses can also cause loss of data. They execute in the system like useful applications but in the long run they cause disastrous results like file locking, corrupting of files and using of disk space as well as precious bandwidth.

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