well, things like HDD can be affected by it but its VERY doubtful due to its encasing. modern HDD are pretty well shielded. However, dont go taking the casing off and then start waving the magnetic screw driver near the HDD magnetic platers like some magic wand. As far as the MBD goes, older ones... yes. Newer ones have a thin layered coating on it that should protect it from minor contact.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.