Abstract: A fixing structure for a hard disk is provided, which includes a main body, a rotation member, and at least one latching post. The main body includes two first sidewalls and a second sidewall connecting therebetween. The main body defines a groove for receiving the hard disk. At least one first sidewall defines a limiting slot. The rotation member includes two rotation arms, at least one rotation arm defines a latching slot. The rotation arms are rotatably connected to the two first sidewalls, to cause the fixing structure to be capable of switching between a first state and a second state. Each latching post is movably disposed in one limiting slot and one latching slot. When the fixing structure is switched between the first direction and the second state, the main body can move along a first direction or a second direction.

Abstract: A server chassis includes a housing provided with a receiving cavity and an opening. A number of trays is arranged in the receiving cavity in a stacked manner. Two sides of each tray are slidably coupled to the housing. Each of the trays is configured to slide out or retract into the receiving cavity through the opening. Each of the trays is used for carrying hard disks in multiple arrays. A difference between a height of the housing and a total height of the trays is less than a height of one tray.