Hard disk, fixing device, and hard disk module

A hard disk module comprising:

• a hard disk, a base shell, a main circuit board mounted on the base shell, a switch mounted on the main circuit board, and a triggering mechanism, wherein the triggering mechanism comprises a triggering rod, the triggering rod is slidably arranged on the base shell along a first direction, the triggering rod is configured to move in the first direction to trigger the switch, thereby causing the main circuit board to power off the hard disk;
• and
• a fixing device comprising a fixing frame configured to install the hard disk and a locking mechanism, wherein the locking mechanism comprises:
• an installation block fixed to an end of the fixing frame;
• a hook arm rotatably connected to the installation block by a shaft, wherein the hook arm comprises a locking handle and a locking hook connected to an end of the locking handle, the locking handle is configured to rotate relative to the installation block about the shaft, thereby driving the locking hook to switching the fixing device between a locked state and an unlocked state;
• a locking block configured to engage with or disengage from the locking handle;
• and
• a pushing assembly comprising a pushing button, wherein the pushing button slidably extends through the installation block and the locking block in the first direction, and the pushing button is configured to push the triggering rod along the first direction and drive the locking block to disengage from the locking handle.