Optimize drives (defragsvc) Service Defaults in Windows 10

Helps the computer run more efficiently by optimizing files on storage drives.

Default Settings

Startup type: Manual
Display name:Optimize drives
Service name:defragsvc
Service type:own
Error control:normal
Path:%SystemRoot%\system32\svchost.exe -k defragsvc
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\defragsvc
  • SeChangeNotifyPrivilege
  • SeImpersonatePrivilege
  • SeIncreaseWorkingSetPrivilege
  • SeTcbPrivilege
  • SeSystemProfilePrivilege
  • SeAuditPrivilege
  • SeCreateGlobalPrivilege
  • SeBackupPrivilege
  • SeManageVolumePrivilege

Default Behavior

Optimize drives is a Win32 service. In Windows 10 it is starting only if the user, an application or another service starts it. When the Optimize drives service is started, it is running as localSystem in its own process of svchost.exe. If Optimize drives fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the defragsvc service has failed to start due to the error.


Optimize drives cannot be started under any conditions, if the Remote Procedure Call (RPC) service is disabled.

Restore Default Startup Configuration of Optimize drives

Before you begin doing this, make sure that all the services on which Optimize drives depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config defragsvc start= demand

3. Close the command window and restart the computer.

The defragsvc service is using the defragsvc.dll file that is located in the C:\Windows\System32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 10 installation media.