USB Attached SCSI (UAS) Driver (UASPStor) Service Defaults in Windows 8

Microsoft Uasp Driver by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:USB Attached SCSI (UAS) Driver
Service name:UASPStor
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UASPStor

Default Behavior

The USB Attached SCSI (UAS) Driver service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If USB Attached SCSI (UAS) 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 UASPStor service hasn't been started.

Restore Default Startup Configuration of USB Attached SCSI (UAS) Driver

1. Run the Command Prompt as an administrator.

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

sc config UASPStor start= demand

3. Close the command window and restart the computer.

The UASPStor service is using the uaspstor.sys file that is located in the C:\Windows\System32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 8 installation media.