JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Disk backplane unit installation Before doing this task, install the midplane board, if it is not already installed. Installation of the diskplane unit is the reverse of removal except as follows: When installing screws, use the disk controller board to index the position of the disk backplane unit. Refer to the removal procedure for other installation steps. Index the position of the disk backplane unit as illustrated. Parent topic: Internal Parts Removal