HPE ProLiant DL345 Gen11 Service And Maintenance Manual page 56

SFF chassis
Remove the LFF drive backplane bracket Remove the LFF drive backplane bracket
Prerequisites Prerequisites
Before you perform this procedure, make sure that you have a T-10 Torx screwdriver available.
About this task About this task
The drive backplane bracket is only present in LFF drive configurations.
HPE ProLiant DL345 Gen11 Server Service and Maintenance Guide 56