FSLogix › ODFC Containers

Number Session VHD(s) To Keep

ComputerIntune-readyOdfcNumberSessionVHDsToKeep

Supported on v2105 or later

26.08

What it does

This setting is used when VHDAccessMode is set to '3'. This controls the number of session VHD(x) containers that are persisted. For example, if this is set to '2' and the user creates a 3rd session, a new session VHD(x) will be created and used and it will be deleted when the 3rd session ends. Th default value is 2 sessions which is the same as "Not Configured" Registry Entry: HKLM\SOFTWARE\Policies\FSLogix\ODFC\NumSessionVHDsToKeep Type: DWORD Values: Min = 0, Max = 10

What it writes

Hive: HKEY_LOCAL_MACHINE
Registry key: Software\Policies\FSLogix\ODFC

Options

Option	Type	Registry value	Allowed values
Number Session VHD(s) To KeepRequiredDefault: 2	Number	`NumSessionVHDsToKeep`	0 to 10

Configure and deploy

Choose a state and the option values; the output below is generated from the template for exactly that.

Enabled · Computer · template defaults

Registry file (.reg)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC]
"NumSessionVHDsToKeep"=dword:00000002

PowerShell

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Number Session VHD(s) To Keep
# Name: OdfcNumberSessionVHDsToKeep
# Scope: Machine
# State: Enabled
# Source: fslogix.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC' -Name 'NumSessionVHDsToKeep' -PropertyType 'DWord' -Value 2

The OMA-URI is an inferred ADMX-backed Policy CSP candidate derived from the source ADMX file name and policy name.
Some Microsoft policies use built-in Policy CSP pages whose area names don't match the ADMX file name, so verify the candidate against Microsoft Learn before deployment.

ADMX profile candidate (OMA-URI)

./Device/Vendor/MSFT/Policy/Config/ADMX_fslogix/OdfcNumberSessionVHDsToKeep

ADMX SyncML candidate

<SyncML xmlns="SYNCML:SYNCML1.2">
  <SyncBody>
    <Replace>
      <CmdID>1</CmdID>
      <Item>
        <Meta>
          <Format>chr</Format>
          <Type>text/plain</Type>
        </Meta>
        <Target>
          <LocURI>./Device/Vendor/MSFT/Policy/Config/ADMX_fslogix/OdfcNumberSessionVHDsToKeep</LocURI>
        </Target>
        <Data>&lt;enabled/&gt;
&lt;data id="OdfcNumberSessionVHDsToKeep" value="2"/&gt;</Data>
      </Item>
    </Replace>
    <Final/>
  </SyncBody>
</SyncML>

Intune remediation scripts

Detection

$ErrorActionPreference = 'Stop'
$reasons = [System.Collections.Generic.List[string]]::new()

function Test-RegistryValueExists {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    return $null -ne (Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue)
}

function Test-RegistryValueEquals {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $Kind,
        [Parameter(Mandatory = $true)][object] $Expected
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    $valueObject = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue
    if ($null -eq $valueObject) {
        return $false
    }

    $actual = $valueObject.$Name
    switch ($Kind) {
        'String' { return [string]$actual -ceq [string]$Expected }
        'ExpandString' { return [string]$actual -ceq [string]$Expected }
        'DWord' { return [uint32]$actual -eq [uint32]$Expected }
        'QWord' { return [uint64]$actual -eq [uint64]$Expected }
        'MultiString' {
            $actualArray = @($actual)
            $expectedArray = @($Expected)
            if ($actualArray.Count -ne $expectedArray.Count) { return $false }
            for ($index = 0; $index -lt $actualArray.Count; $index++) {
                if ([string]$actualArray[$index] -cne [string]$expectedArray[$index]) { return $false }
            }
            return $true
        }
        'Binary' {
            $actualArray = [byte[]]$actual
            $expectedArray = [byte[]]$Expected
            if ($actualArray.Length -ne $expectedArray.Length) { return $false }
            for ($index = 0; $index -lt $actualArray.Length; $index++) {
                if ($actualArray[$index] -ne $expectedArray[$index]) { return $false }
            }
            return $true
        }
        default { return [string]$actual -ceq [string]$Expected }
    }
}

# Policy: Number Session VHD(s) To Keep
# Name: OdfcNumberSessionVHDsToKeep
# Scope: Machine
# State: Enabled
# Source: fslogix.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC' -Name 'NumSessionVHDsToKeep' -Kind 'DWord' -Expected 2
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC\NumSessionVHDsToKeep') | Out-Null
}

if ($reasons.Count -eq 0) {
    Write-Output 'Compliant'
    exit 0
}

$reasons | ForEach-Object { Write-Output $_ }
exit 1

Remediation

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Number Session VHD(s) To Keep
# Name: OdfcNumberSessionVHDsToKeep
# Scope: Machine
# State: Enabled
# Source: fslogix.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC' -Name 'NumSessionVHDsToKeep' -PropertyType 'DWord' -Value 2

History 1 retained release

26.0827 Aug 2026
- Already present in the first release ChangeIntel keeps.

Template

Internal name: OdfcNumberSessionVHDsToKeep
Namespace: FSLogix.Policies
Template file: fslogix.admx
Release: Microsoft FSLogix 26.08 · file set d042c1d887a47461…

Definition, editor controls and support

Definition

<policy class="Machine" displayName="$(string.OdfcNumberSessionVHDsToKeep_Display)" explainText="$(string.OdfcNumberSessionVHDsToKeep_Explain)" key="Software\Policies\FSLogix\ODFC" name="OdfcNumberSessionVHDsToKeep" presentation="$(presentation.OdfcNumberSessionVHDsToKeep)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="FSLogix.Policies:ODFC" />
      <supportedOn ref="FSLogix.Policies:v2105" />
      <elements>
        <decimal id="OdfcNumberSessionVHDsToKeep" key="Software\Policies\FSLogix\ODFC" maxValue="10" required="true" valueName="NumSessionVHDsToKeep" />
      </elements>
    </policy>

Editor controls

<presentation id="OdfcNumberSessionVHDsToKeep" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
        <decimalTextBox defaultValue="2" refId="OdfcNumberSessionVHDsToKeep">Number Session VHD(s) To Keep</decimalTextBox>
      </presentation>

Supported platforms and category

FSLogix.Policies:category:FSLogix
<category displayName="$(string.FSLogix_Category)" name="FSLogix" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
FSLogix.Policies:category:ODFC
<category displayName="$(string.ODFC_Category)" name="ODFC" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="FSLogix.Policies:FSLogix" />
    </category>
FSLogix.Policies:definition:v2105
<definition displayName="$(string.v2105_Definition)" name="v2105" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
FSLogix.Policies:category:FSLogix
<category displayName="$(string.FSLogix_Category)" name="FSLogix" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="FSLogix.Policies:FSLogix_Category">FSLogix</string></strings>
FSLogix.Policies:category:ODFC
<category displayName="$(string.ODFC_Category)" name="ODFC" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="FSLogix.Policies:FSLogix" />
    </category>
<strings><string id="FSLogix.Policies:ODFC_Category">ODFC Containers</string></strings>
FSLogix.Policies:definition:v2105
<definition displayName="$(string.v2105_Definition)" name="v2105" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="FSLogix.Policies:v2105_Definition">v2105 or later</string></strings>