Hello There is always risk when making hardware or software changes. If there are additional steps required for a firmware or BIOS update it should be mentioned in the release notes, important notes, or installation instructions of the update. If there are no issues with the updates then there should be no data loss. Thanks
Trying to update the both firmwares of PowerEdge T320 and PERC H310 RAID adapter installed on it.   This PowerEdge T320 has MS Windows server 2012 Standard on it. PERC H310 card is implementing RAID1 with two HDDs.   The firmware (BIOS) version of PowerEdge T320 is 1.5.1 with release date 03/08/2013. The firmware version of PERC H310 card is 20.12.0-0004.   On Dell website, I found update packages which could be launched inside the MS Windows OS.  Is there any thing I will have to do in preparation for the firmware updates of both PowerEdge T320, and PERC H310 adapter?  Any risks such as losing RAID on PERC H310 card etc?   Thanks  
Firmware updates and risks