Electronic hard drive failures are impossible
to predict and can happen to any hard drive
at any time. Too much heat causing burn out
of one or more chips or components on the board
can cause an electronic hard drive failure.
Another reason may be fault during manufacturing
to where the component just fails during operation.
It is also possible that the hard drive is just
beyond its normal lifetime of operation, MTBF,
mean time before failure.
Methods of Recovering Data From a Failed Hard
Drive with physical failure: