Copy-FSLogixDiskToIncreaseShrink

#Requires -RunAsAdministrator
#Requires -Modules 'Hyper-V'

# Once this has been run once, you will be able to use the Invokle-ShrinkFslDisk tool to get max shrink from all disks, without having to copy.
# Required Services =  'defragsvc', 'vds', 'smphost' ! This script will fail if you don't have these services running !
# Change the source and target path as needed
# Run from a VM with FSLogix installed
# Does not need to be run on a FileServer


$sourcePath = 'D:\Test VHDs\Profile_User2.vhdx'
$targetPath = 'D:\Test VHDs\New.vhdx'

# Check FSlogix is installed
$exePath = Join-Path $Env:ProgramFiles 'FSLogix\Apps\frx.exe'

If (-not (Test-Path $exePath)){
    Write-Error 'frx.exe not found at path'
    return
} 

#create very small disk
& $exePath create-vhd -fileName $targetPath -size-mbs 200

#resize disk to same size as s ource disk ( this means you can shirink it later )
Resize-VHD -Path $targetPath -SizeBytes ((Get-diskimage -ImagePath $sourcePath).Size)

#Need to also resize partition inside disk so mount it first
$mountInfo = Mount-VHD -Path $targetPath -Passthru

#Getpartition inormation so we can change partition size
$partition = Get-Partition -DiskNumber $mountInfo.DiskNumber

#Change partition size to the maxmimum amount
Resize-Partition -Size ($mountInfo | Get-PartitionSupportedSize).Sizemax -DiskNumber $mountInfo.DiskNumber -PartitionNumber $partition.PartitionNumber

#Clean up by dismounting the disk
$mountInfo | Dismount-VHD

#Copy contents of old disk to new disk
& $exePath migrate-vhd -src $sourcePath -dest $targetPath