The power supply of my external hard drive just died. Luckily I quickly found a replacement unit in a drawer.
As far as I can tell the drive survived this incident without any physical or filesystem damages. Still this raises some questions:
I once attended a course "Funktionsstörungen/Dysfunctions" at Aachen University, that dealt with disorders of several functions of the brain and insights that can be concluded therefrom. A recent TED talk by Vilayanur Ramachandran picked-up that topic and is definitely worth watching.