- Oct 9, 2014
You are referring to the H screws, right? Those are used for attaching the stacking brackets to the sides of 2.5 inch drives (one on top of the other). This way you can get two drives in the mounting space of one drive, such as either side of the front panel or on the bottom of the case. Note that there is only room for two drives underneath the front cover if they are both 7 mm thick. The H screws are also used to attach the power supply and side fan brackets to the M1 chassis.