> although computers themselves are mostly infallible What do you mean? Hardware is fallible too, just less often than software. This may cause problem on its

> although computers themselves are mostly infallible What do you mean? Hardware is fallible too, just less often than software. This may cause problem on its own e. g. bit flips in non-ECC memory, HDD which lie (reply to flush cache before data is actually written) or HW can trigger software errors, e. g. HW can crash at random moment and SW can be not designed to handle this properly.