We will treat this as HDD failure and replace the disks. Just glad that we did not do any firmware upgrades while the server was in production. 
Hello, Bit of a strange issue here; We have two identical servers running Windows Server 2016 Datacenter Edition and we decided to re-purpose these servers and thought we could start by completing all the firmware and driver upgrades from Dell. After checking, we noticed that the servers only needed the BIOS firmware upgraded from 2.15.0 to 2.16.0. We have downloaded and executed BIOS_7557V_WN64_2.16.0_02.exe file within windows. After the BIOS installation was completed we rebooted the servers. While connected to the iDRAC we could see the upgrade was successful and it rebooted back in to the windows again. This is when we started seeing HDD failures. First server had two HDD failures and the second one had four failures which I thought it was very odd. Troubleshooting steps I have tried: None of the steps above helped. I have noticed the failed HDD models are all very similar (PX02SSF020 or PX02SSF020 with A4B3 firmware). Is it possible that these have failed all at the same time? Is there anything else for me to try?
Multiple HDD failures after BIOS firmware upgrade - PowerEdge 730xd