A foldable fixing apparatus for fixing a hard disk drive includes a handle and two collapsible arms. The handle includes a sidewall. Each collapsible arm includes a fixing arm and a pivot arm. First ends of the fixing arms are rotatably connected to opposite ends of the sidewall. The pivot arms are rotatably connected to second ends of the fixing arms opposite to the first ends. When the pivot arms are pivoted to fold to the corresponding fixing arms, the collapsible arms are capable of being folded to the handle. When the fixing arms are rotated to be perpendicular to the sidewall of the handle, and the pivot arms are unfolded from, and aligned with, the corresponding fixing arms, the hard disk drive is capable of being mounted between the collapsible arms.