A mounting apparatus for a data storage device includes a bracket, a support member slidably mounted to the bracket, two first and second locking members, and two clamping members. Each first locking member includes a first hook detachably locked to the support member, and a fixing pole to clamp the corresponding clamping member. Each second locking member includes a second hook fixed to the support member, and a fixing portion to fix the corresponding clamping member. When the first hooks of the first locking members disengage from the support member, and the first locking members are rotated to drive the corresponding clamping members away from the support member. When the data storage device is sandwiched between the support member and the clamping members, the first locking members are rotated to make the first hooks lock to the support member.