The Write-cache Buffer
Certain InterSystems IRIS features utilize Windows write-cache buffer flushing, which is enabled by default. To verify this option is correctly enabled and InterSystems IRIS receives the full benefit of these features:
Open the Device Manager from the Control Panel.
Select the storage device from the Disk Drives section.
Click on the Policies tab.
Ensure that Turn off Windows write-cache buffer flushing on this device is not selected.