Hello,
Yes I know they are not officially supported by HP since they are not HP-branded, but I was hoping someone out there have already tried using these disks 845 DC Evo/Pro series in a raid setup with a P420 and could share their findings. Since the disks are made for the DataCenter, hence the name DC, my guess is they will work without any problems but I'm not bold enough to buy a couple of them not knowing in advance that there will be a good chance they will work without any issues.