New-Partition assignes driver letter to mount point after reboot.

Question

Trying to create a series of mount points using powershell on Server 2012 R2. When I have used diskpart in the past I could initialize the disk, create a partition, format a volume and assign a mount point without assigning a driver letter to the drive.
When I try to do the same thing in Powershell on Server 2012 R2, everything looks great until I reboot. Every partition I created and assigned as a mount mount gets a driver letter added to it... I am using mount points to avoid drive letters. Is there a way
to prevent this behavior.  The following is an example:
Get-Disk 3 | Initialize-Disk -PartitionStyle GPT
Get-Disk 3 | new-Partition -UseMaximumSize -AssignDriveLetter:$False | Format-volume -confirm:$False
Add-Partitionaccesspath -DiskNumber 3 -Partition 2 -AccessPath c:\someFolder
Everything looks good at this point with no driver letter assigned. Rebooting adds a driver letter to the volume with no impact on the mount point... Is there a way to suppress the driver letter assignment?

Answer 1

Figured it out... It appears that this part works fine:
Get-Disk 3 | Initialize-Disk -PartitionStyle GPT
$Part = Get-Disk 3 | new-Partition -UseMaximumSize -AssignDriveLetter:$False
$Part | set-partition -NoDefaultDriveLetter:$True
$Part | Format-volume -confirm:$False
If you look at the output of Get-Partition the NoDefaultDriveLetter value is TRUE. After running Add-PartitionAccessPath it changes to FALSE. You can set it back with the Set-Partition command:
Get-Partition -DiskNumber 3 -Partition 2 | add-PartitionAccessPath c:\SomePath -passthru | set-Partition -NoDefaultDriveLetter:$True
I had a bunch of them to do so I used the following:
Function Config-Disk {
[cmdletbinding()]
Param(
[INT]$Disk,
[INT]$Partition = 2,
[String]$Label,
[String]$MountPoint
Get-Disk $Disk | Initialize-Disk -Partitionstyle GPT
Get-Disk $Disk | New-Partition -UseMaximumSize |
Format-Volume -FileSystem NTFS -NewFileSystemLabel $Label -Confirm:$False
Add-PartitionAccessPath -DiskNumber $Disk -PartitionNumber $Partition -AccessPath $MountPoint -Passthru |
set-Partition -NoDefaultDriveLetter:$True
MD "c:\SomeLocation1"
MD "c:\SomeLocation2"
Config-Disk -Disk 3 -Label "SomeLabel1" -MountPoint "c:\SomeLocation1"
Config-Disk -Disk 4 -Label "SomeLabel2" -MountPoint "c:\SomeLocation2"