USB Mass Storage Driver (USBSTOR) Service Defaults in Windows 8

USB Mass Storage Class Driver by Microsoft Corporation.

Default Settings

Startup type:Manual
Display name:USB Mass Storage Driver
Service name:USBSTOR
Service type:kernel
Error control:normal
Path:%SystemRoot%\System32\drivers\USBSTOR.SYS
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR

Default Behavior

The USB Mass Storage Driver service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If USB Mass Storage Driver fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the USBSTOR service hasn't been started.

Restore Default Startup Configuration for USB Mass Storage Driver

1. Select your Windows 8 edition and update pack, and then click Download.

2. Save the Win8_USBSTOR_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The USBSTOR service is using the USBSTOR.SYS file that is located in the %WinDir%\System32\drivers folder. If the file is corrupted or deleted, you can put it back in there.