Symptoms

NVMe Drives disappear or do not work when in Legacy Mode. Affected Platforms Precision 5820 TowerPrecision 7820 TowerPrecision 7920 Tower

Cause

The Intel Volume Management Device (VMD) Technology (also known as Intel® Virtual RAID on CPU or vROC) does not support Legacy Mode. These drives will only show up attached to the controller when in UEFI Mode.

Resolution

Go into BIOS and disable the VMD controllers so that the platform uses the native NVMe controllers and NVMe Drivers on the operating system. Boot into BIOS setupNavigate to System Configuration an Intel VMD Technology and change the computer from Auto to Disabled and clear all the PCIE boxes on the same page (Figure 1). Figure 1: System Configuration Click apply, OK, and then Exit. Hot plug would no longer be supported on these drives when used in this mode.

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