NTFS parallel flush worker threads
Verified with Windows 11 25H2 — updated on July 10, 2026
Supported on: At least Windows Server 2016, Windows 10
Path in the GPO console
Computer Configuration\Administrative Templates\System\File System\NTFS Description
When flushing modified file data from memory, NTFS chooses to use one or more threads based on how many files are currently open. This setting gives control over how many threads will be used. Making this value larger may decrease the time it takes to flush a volume but the flush may have a larger impact on other concurrent IO operations. Values with special meaning: 0: Use the system calculated default 1: Disable parallel flush The default value and limit for this setting varies based on the number of available processors on a given system: - Default value calculation is: (([NumProcessors]/2) + 1) - Default max value calculation is: ([NumProcessors]*2)
Registry
HKLM
System\CurrentControlSet\Policies Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: NTFS parallel flush worker threads
; State: Enabled
; Supported on: At least Windows Server 2016, Windows 10
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Policies]
"NtfsParallelFlushWorkers"=dword:00000005More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: NTFS parallel flush worker threads
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
$path = 'HKLM:\System\CurrentControlSet\Policies'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'NtfsParallelFlushWorkers' -Value 5 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: NTFS parallel flush worker threads
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\System\CurrentControlSet\Policies' -Name 'NtfsParallelFlushWorkers' -Expected 5 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: NTFS parallel flush worker threads
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
$path = 'HKLM:\System\CurrentControlSet\Policies'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'NtfsParallelFlushWorkers' -Value 5 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: NTFS parallel flush worker threads
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: NTFS parallel flush worker threads
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\System\CurrentControlSet\Policies' -Name 'NtfsParallelFlushWorkers' -Expected 5 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: NTFS parallel flush worker threads
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
$path = 'HKLM:\System\CurrentControlSet\Policies'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'NtfsParallelFlushWorkers' -Value 5 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.