FSLogix › ODFC Containers

VHDX Sector Size

ComputerIntune-readyOdfcVHDXSectorSize

Supported on v2105 or later

26.08

What it does

This setting is only applicable if the virtual disk type is VHDX. The default is the sytem default which is the same as "Not Configured". Registry Entry: HKLM\SOFTWARE\Policies\FSLogix\ODFC\VHDXSectorSize Type: DWORD Values: 0 = System Default, 512, 4096

What it writes

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

Options

Option	Type	Registry value	Allowed values
OdfcVHDXSectorSize	Drop-down list	`VHDXSectorSize`	512 bytes`512` 4 KB`4096`

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]
"VHDXSectorSize"=dword:00000200

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: VHDX Sector Size
# Name: OdfcVHDXSectorSize
# Scope: Machine
# State: Enabled
# Source: fslogix.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC' -Name 'VHDXSectorSize' -PropertyType 'DWord' -Value 512

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.
The generated payload is incomplete because one or more ADMX element values were not supplied: OdfcVHDXSectorSize

ADMX profile candidate (OMA-URI)

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

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: VHDX Sector Size
# Name: OdfcVHDXSectorSize
# Scope: Machine
# State: Enabled
# Source: fslogix.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC' -Name 'VHDXSectorSize' -Kind 'DWord' -Expected 512
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC\VHDXSectorSize') | 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: VHDX Sector Size
# Name: OdfcVHDXSectorSize
# Scope: Machine
# State: Enabled
# Source: fslogix.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\FSLogix\ODFC' -Name 'VHDXSectorSize' -PropertyType 'DWord' -Value 512

History 1 retained release

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

Template

Internal name: OdfcVHDXSectorSize
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="$(string.OdfcVHDXSectorSize_Display)" explainText="$(string.OdfcVHDXSectorSize_Explain)" key="Software\Policies\FSLogix\ODFC" name="OdfcVHDXSectorSize" presentation="$(presentation.OdfcVHDXSectorSize)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="FSLogix.Policies:ODFC" />
      <supportedOn ref="FSLogix.Policies:v2105" />
      <elements>
        <enum id="OdfcVHDXSectorSize" key="Software\Policies\FSLogix\ODFC" valueName="VHDXSectorSize">
          <item displayName="$(string.OdfcVHDXSectorSize_0_Enum)">
            <value>
              <decimal value="512" />
            </value>
          </item>
          <item displayName="$(string.OdfcVHDXSectorSize_1_Enum)">
            <value>
              <decimal value="4096" />
            </value>
          </item>
        </enum>
      </elements>
    </policy>

Editor controls

<presentation id="OdfcVHDXSectorSize" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
        <dropdownList refId="OdfcVHDXSectorSize" />
      </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>