How can I create and mount a new VHDX volume without a drive letter assigned? On some servers I get the behaviour described below, on others it works like it should. So there must be a system setting which affect this behaviour besides AutoMount.

I use the following code to create and mount a VHDX volume with Powershell

New-VHD -path $vhdpath -SizeBytes $vhdSize -Dynamic | `
Mount-VHD -NoDriveLetter -Passthru

This creates the VHDX file and mounts ist into the system. Then the DiskManagement window popus up instantly, asking me to initialize the new volume. But I want to initialize, partition and format the volume using scripting.

I found hints to disable the windows AutoMount feature, but this did not help.

Also the system assigns a random drive letter to the volume when I manuall abort the initializing dialog and proceed with the following commands:

$d = InitializeDisk -Number 4 -PartitionStyle GPT
$p = New-Partition -DiskNumber $d.Number -UseMaximumSize -AssignDriveLetter:$False
$v = Format-Volume -Partition $p -FileSystem NTFS -Confirm:$false
Add-PartitionAccessPath -DiskNumber $d.Number -PartitionNumber $p.PartitionNumber -AccessPath "C:\mount"

Then the partition is created and mounted into C:\mount. But the system also assigns a drive letter. I do not want this.

System: Windows Server 2012 R2 Standard Shell: Powershell 4.0

1 Answer 1


I found the cause of the problem for myself now. There was the USB Drive Letter Manager Service running on the server which showed the suspect behaviour.

Now I stop this service before I create and mount the VHD and start it afterwards again.

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