Hard Drive Addition in DellPowerEdge R720

 While Adding New Harddrive (Figure 2) to Dell PowerEdge R720, Already having two hard drives(Figure 1) of 1.2 TB and 10K RPM 

Figure 1

Figure 2

But, Operating System was not picking it up, not even in unallocated or not initialized. the reason was that, this harddrive was configured as RAID in the bios, while system was configured as NON RAID.

So in order to make it working, we have to configured it as NON RAID through BIOS