Fujitsu PRIMERGY RX2520 M5

Installing a 3.5-inch HDD backplane
Figure 55: Jumper on a 3.5-inch HDD backplane
If there is a jumper installed on the backplane, remove the 2-pins
connector X13.
Hard disk drive (HDD) / solid state disk (SSD)
RX2520 M5 Upgrade and Maintenance Manual 143