Press the F2 key during the POST to open the System Setup menu.
Or the F10 key to open the Lifecycle Controller menu and select System Setup → Advanced Hardware Configuration.
On the System Setup Main Menu screen, click Device Settings.
On the Device Settings screen, click the target RAID controller.
For the 14th generation system, select Main Menu on the Dashboard View after selecting the controller.
On the Main Menu screen, click Virtual Disk Management.
On the Virtual Disk Management screen, click the virtual disk to be deleted.
Select Delete Virtual Disk from the Operation drop-down menu and click Go.
Read the warning displayed, select Confirm, and click Yes.
Once the "The Operation has been performed successfully" message is displayed, click OK.
On the Virtual Disk Management screen, ensure that the deleted virtual disk is not listed.