HPE ProLiant DL360 Maintenance And Service Manual page 233

Optional rear device bay numbering Optional rear device bay numbering
The optional rear device bay supports either 1 SFF drive in a SmartDrive carrier, or 2 uFF M.2 drives in an HPE Smart Carrier M.2 (SCM).
When the HPE SFF Flash Adapter is installed, the uFF drives are recognized as 1 and 101.
Device numbers 233