TFM module to enable a Flash Backup Unit (FBU) on a PRAID EP420i/e controller. Contains flash memory and control logic for FBU. Max. 1x per system. Please remember to check if the required drive bays or slots are available on your system before placing your order. Please note: This option is required to install a Flash Backup Unit (FBU). For certified/approved PRIMERGY systems. For more information, please refer to the system manual.