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How to relocate the Package Cache

View Move-WixPackageCache.ps1
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This license governs use of the accompanying software. If you use the software, you
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A "contribution" is the original software, or any additions or changes to the software.
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(E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular purpose and non-infringement.
#Requires -Version 3.0
[Parameter(Position=0, Mandatory=$true)]
[string] $Path,
[ValidateRange(0, 2TB)]
[long] $Size = 1TB
# Require elevated privileges (Tip: PSv4 supports '#Requires -RunAsAdministrator').
$Principal = New-Object System.Security.Principal.WindowsPrincipal ([System.Security.Principal.WindowsIdentity]::GetCurrent())
if (-not $Principal.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator))
Write-Error 'Elevated privileges are required to move the package cache.' -Category PermissionDenied
# Make sure modules are loaded (Tip: PSv3 supports '#Requires -Modules <String[]>').
Import-Module 'Dism', 'Storage', 'ScheduledTasks'
$VhdPath = Join-Path $Path 'Cache.vhd'
$CachePath = Join-Path $env:ProgramData 'Package Cache'
# Make sure the necessary Windows features are enabled.
$Features = 'Microsoft-Hyper-V-All', 'Microsoft-Hyper-V-Tools-All', 'Microsoft-Hyper-V-Management-PowerShell' | ForEach-Object {
Get-WindowsOptionalFeature -Online -FeatureName $_ -Verbose:$false
} | Where-Object { $_.State -ne 'Enabled' } | Select-Object -expand FeatureName
if ($Features)
Write-Verbose "Installing required Windows feature(s): $($Features -split ', ')"
Enable-WindowsOptionalFeature -Online -FeatureName $Features -NoRestart -Verbose:$false
if (-not $?)
# Create, partition, and format the cache VHD.
if (-not (Test-Path $Path -PathType Container))
Write-Verbose "Creating directory for virtual disk: $Path"
$null = New-Item $Path -Type 'Directory'
elseif (Test-Path "$VhdPath" -PathType Leaf)
Write-Error "A virtual disk already exists at `"$VhdPath`"." -Category ResourceExists
Write-Verbose "Creating virtual disk: $VhdPath"
$Disk = New-VHD "$VhdPath" -SizeBytes $Size -Dynamic | Mount-VHD -NoDriveLetter -Passthru
if (-not $?)
$Acl = New-Object System.Security.AccessControl.FileSecurity
$Acl.SetSecurityDescriptorSddlForm('O:BAG:DUD:P(A;;FA;;;BA)(A;;FA;;;SY)(A;;FRFX;;;BU)(A;;FRFX;;;WD)', 'All')
$Acl | Set-Acl $Disk.Path
$Partition = Initialize-Disk $Disk.Number -PassThru | New-Partition -UseMaximumSize
$null = $Partition | Format-Volume -FileSystem NTFS -NewFileSystemLabel 'Package Cache' -Confirm:$false
$Volume = $Partition | Add-PartitionAccessPath -AssignDriveLetter -PassThru | Get-Volume
$Drive = "$($Volume.DriveLetter):"
$Acl = New-Object System.Security.AccessControl.DirectorySecurity
$Acl.SetSecurityDescriptorSddlForm('O:BAG:DUD:PAI(A;OICIID;FA;;;BA)(A;OICIID;FA;;;SY)(A;OICIID;FRFX;;;BU)(A;OICIID;FRFX;;;WD)', 'All')
Set-Acl "$Drive\" -AclObject $Acl
Write-Verbose "Created and formatted drive: $Drive, label: Package Cache"
# Copy the existing package cache (if any).
if (Test-Path "$CachePath" -PathType Container)
Write-Verbose "Copying contents from: $CachePath; to: $Drive"
Copy-Item "$CachePath\*" "$Drive\" -Recurse
if (-not $?)
Write-Verbose "Deleting directory: $CachePath"
Remove-Item "$CachePath" -Force -Recurse
if (-not $?)
# Create the empty directory and mount the VHD into it.
Write-Verbose "Creating empty directory: $CachePath"
New-Item "$CachePath" -Type 'Directory' -Force | Set-Acl -AclObject $Acl
if (-not $?)
Write-Verbose "Mounting virtual disk into directory: $CachePath"
$Partition | Add-PartitionAccessPath -AccessPath "$CachePath" -PassThru | Remove-PartitionAccessPath -AccessPath "$Drive"
Write-Verbose "Removed drive letter: $Drive"
# Schedule a task to make sure the VHD is always mounted on boot.
Write-Verbose "Creating script to mount VHD: $VhdPath, path: $ScriptPath"
$ScriptPath = [System.IO.Path]::ChangeExtension($VhdPath, '.txt')
select vdisk file=$VhdPath
attach vdisk
"@ | Set-Content $ScriptPath -Force
Get-Acl $VhdPath | Set-Acl $ScriptPath
Write-Verbose "Scheduling task to mount VHD: $VhdPath"
$trigger = New-ScheduledTaskTrigger -AtStartup
$action = New-ScheduledTaskAction -Execute (get-command diskpart.exe).Path -Argument "/s `"$ScriptPath`""
$settings = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries
$user = New-ScheduledTaskPrincipal -UserId 'SYSTEM' -RunLevel Highest -LogonType ServiceAccount
$null = Register-ScheduledTask -TaskName 'Attach Package Cache' -Trigger $trigger -Action $action -Settings $settings -Principal $user -Force
Move the Burn package cache to another drive or directory.
Actually moving the Burn package cache to another drive or directory is currently not supported.
Instead this script creates a expandable virtual disk (VHD) in whatever directory you want - even on another drive.
Any existing payload is copied and the expandable virtual disk is mounted into the now empty package cache.
.Parameter Path
The directory in which the package cache is moved.
.Parameter Size
The maximum size of the expandable virtual disk to create. The default is 1TB.
You need administrator privileges to run this script.

It does not work on my Surface:
DiskPart has encountered an error: The security ID structure is invalid
any idea?


@psallandre, I'm not sure without more detail about where it happened in the script (i.e. a stack trace would be more helpful) but since you only have one drive why would you move the files to a VHD sitting on the drive? While not very much, the VHD does have overhead so you'd actually be increasing drive space consumption.

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