A video of this procedure is available at YouTube: https://youtube.com/playlist?list=PLYV5R7hVcs- 
DoEcxrm2zKNpaKOdZ3f8Qc
.
Procedure
Step 1.  Locate the M.2 drive slot on the M.2 boot adapter. 
Note: As ThinkSystem ST250 V2 supports two M.2 drives, install your M.2 drive in slot 0 first.
Figure 38. M.2 drive slots
Table 23.  M.2 drive slot locations on M.2 boot adapter
1  M.2 drive slot 0 2  M.2 drive slot 1
Step 2.  Install an M.2 drive. 
a. 
Insert the M.2 drive at an angle into the connector.
b. 
Pivot the M.2 drive down until the notch catches on the lip of the retainer.
c. 
Slide the retainer forward (towards the connector) to secure the M.2 drive into place.
Figure 39. Installing an M.2 drive
After installing the M.2 drive, use the Lenovo XClarity Provisioning Manager to configure the RAID. For more 
information, see:  
http://sysmgt.lenovofiles.com/help/topic/LXPM/RAID_setup.html
Install a RAID flash power module
Use this information to install a RAID flash power module.
Chapter 3. Server hardware setup 83