A:Answer Your hard drive, just like your computer, runs on low voltage DC power. This power is delivered to the hard drive by a power supply that converts the AC voltage of your wall to the correct DC voltage. Your computer power supply and motherboard are sensitive components that could be destroyed by a power surge.
If this power supply is damaged, it is possible that the voltage or current supplied to the drive could also move out of proper operating specifications, damaging the drive itself (either by damaging the logic board or causing mechanical failure).
In most cases, a surge would only damage the power supply, once replaced you should be able to access the existing hard drive or extrenal backup... but it is certainly possible for the hard drive to be irreparably damaged as well if the surge was strong enough.
