Symptom
1704-Slot X System Halted. Unsupported Virtual Mode Disk Operation. Action: Install proper DOS driver.
Cause
The operating system that is currently running does not support virtual service.
Action
Install a driver that supports virtual service. For more information, see "Keeping the system current" in the HPE ProLiant Gen9 Troubleshooting Guide, Volume I on the Hewlett Packard Enterprise website.