IBM 9009-41A Manual page 27

Figure 10. Removing the RDX drive filler
b) Holding the clips, pivot the filler away from the disk drive backplane.
c) Lift the filler out of the system.
5. Unplug but do not remove the front drives and front fillers if present from their slots. Pull the disk
drives and fillers out far enough to prevent them from interfering with the removal of the disk drive
backplane as shown in the following figure.
Drive backplanes for the 9009-41A, 9009-41G, 9009-42A, 9009-42G, or 9223-42H 13