UPDATE: I returned one of the ADATA drives and purchased a HP EX920. Both drives will now show up now.   I was doing testing on my UPS setup to make sure the server will come back on after a power outage. I have a CyberPower CP1500AVRLCD UPS and am using the NUT plugin for communication. I noticed the UPS was turning off before the server would shut down. This was causing a hard shutdown and the ADATA drive would not show up after powering the server back on, not even in BIOS/UEFI