A mounting apparatus includes an enclosure, a bracket for fixing a data storage device, an assistant plate arranged between the bracket and the enclosure, a handle pivotably mounted to the bracket, and a resisting member. The assistant plate defines a through hole and a locking hole. A handle with a locking portion is pivotably attached to the bracket. The resisting member is slidably mounted between the assistant plate and the first sidewall. The resisting member includes a pull portion corresponding to the through hole, and a resilient tongued portion engaged in the through hole of the assistant plate. When the handle is rotated toward to the base, the locking portion of the handle extends through the locking hole of the assistant plate to engage with the pull portion to move the resisting member to deform the tongued portion, such that the tongued portion is raised to resist against the bracket.