Well, for me it's noise, power/heat and shock resistance (in laptops). And these have also indirect negative consequences. For example, an external 3.5" HDD nee

Well, for me it's noise, power/heat and shock resistance (in laptops). And these have also indirect negative consequences. For example, an external 3.5" HDD needs an additional power supply and cable in addition to the data cable, which is cumbersome and reduces portability.