HPE ProLiant DL345 Gen11 Service And Maintenance Manual page 275

Midplane: 8 SFF
8 SFF 24G x1 U.3 NVMe / SAS UBM3 BC
8 SFF 24G x4 U.3 NVMe / SAS UBM3 BC
For more information on the drive backplane description, see Drive backplane naming.
Front: 8 LFF + 2 SFF drive bay numbering Front: 8 LFF + 2 SFF drive bay numbering
Front: 16 SFF + 2 SFF drive bay numbering Front: 16 SFF + 2 SFF drive bay numbering
Front: 24 SFF drive bay numbering Front: 24 SFF drive bay numbering
Midplane: 8 SFF drive bay numbering Midplane: 8 SFF drive bay numbering
HPE ProLiant DL345 Gen11 Server Service and Maintenance Guide 275