Windows Vista Services

Sym_u3 - Windows Vista Service

LSI Logic Ultra160 SCSI Miniport Driver by LSI Logic.

This service also exists in Windows XP.

Startup Type

Since Sym_u3 is a kernel mode driver, its startup might be configured depending on installed hardware. Changing its startup configuration might cause hardware issues. In the table below you can see how it is configured on my system, but your default settings might differ from mine.

Windows Vista edition without SP SP1 SP2
Starter Disabled Disabled Disabled
Home Basic Disabled Disabled Disabled
Home Premium Disabled Disabled Disabled
Business Disabled Disabled Disabled
Ultimate Disabled Disabled Disabled

Default Properties

Display name:Sym_u3
Service name:Sym_u3
Error control:normal
Group:SCSI Miniport

Default Behavior

Sym_u3 is a kernel mode driver. If Sym_u3 fails to start, the error is recorded into the Event Log. Windows Vista startup proceeds, but a message box is displayed informing you that the Sym_u3 service has failed to start.

Restore Default Startup Type for Sym_u3

Automated Restore

1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.

2. Save the RestoreSymu3WindowsVista.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the sym_u3.sys file exists in the %WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows Vista installation media.