b. “Install the 7mm drive cage” on page 211c. “Rear drive backplane and drive cage replacement” on page 213d. “Install the top cover” on page 2782. Complete the parts replacement. See “Complete the parts replacement” on page 279.Middle drive cage and drive backplane replacementFollow instructions in this section to remove and install the middle drive cage and drive backplanes.Depending on the server configurations, the server supports one of the following middle drive cages. Fordetailed information, see “Technical rules” on page 51.Drive cage type Backplane typeMiddle 2.5-inch 8-bay drive cage• Two 2.5-inch SAS/SATA 4-bay backplanes• Two 2.5-inch NVMe 4-bay backplanesMiddle 3.5-inch 4-bay drive cageOne 3.5-inch SAS/SATA 4-bay backplane• “Remove the middle drive cage and drive backplanes” on page 162• “Install the middle drive backplanes and drive cage” on page 165Remove the middle drive cage and drive backplanesFollow instructions in this section to remove the middle drive cage and drive backplanes.162 ThinkSystem SR665 V3 User Guide