The reasons for damage followed by the inaccessibility of
data can be divided into two groups:
Physical

electrical (power
loss, surge, polarity reversal ...)

manufacturing defects

liquid intrusion

excess temperature (overheating)

dusty environment

gravitation (fall, shock ...)

human error or abuse

nature
disasters (floods, fire, earthquake ...)
Software

application or the operation system collapses

virus infection

human error or abuse (
erasing, overwriting, formatting ...)