U disk is full of integrated circuits, which has excellent seismic and impact resistance, and is not afraid of falling. Generally, external force will hardly damage the U disk. At the same time, as long as the U disk is safely unloaded and taken out every time, it will not be damaged, and it is not pulled out by brute force.
Because the mobile hard disk is a mechanical hard disk, its impact resistance is very poor. When it hits or falls, especially when it is powered on, it is very easy to cause the head to hit the disk surface and be damaged, resulting in hardware damage and data loss. Therefore, the mobile hard disk will be more easily damaged than the USB flash drive.