https://github.com/jesusninoc/ClasesISO/blob/master/2018-03-05.md
https://serverfault.com/questions/338937/differences-between-dev-sda-and-dev-sda1
This example creates a new 127GB VHD and then mounts, initializes, and formats it so the drive is ready to use.
$vhdpath = "C:\VHDs\Test.vhdx"
$vhdsize = 127GB
New-VHD -Path $vhdpath -Dynamic -SizeBytes $vhdsize | Mount-VHD -Passthru |Initialize-Disk -Passthru |New-Partition -AssignDriveLetter -UseMaximumSize |Format-Volume -FileSystem NTFS -Confirm:$false -Force