What is SiWinAcc?

SiWinAcc.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if SiWinAcc.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for SiWinAcc drivers in need of updating

SiWinAcc.sys file information

The process known as Windows Accelerator Driver belongs to software SATALink Accelerator Driver or SATALink Accelerator driver by Silicon Image (

Description: SiWinAcc.sys is not essential for the Windows OS and causes relatively few problems. The SiWinAcc.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 10,368 bytes (28% of all occurrences), 19,240 bytes, 10,240 bytes, 17,328 bytes or 9,600 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. The file is not a Windows core file. SiWinAcc.sys appears to be a compressed file. Therefore the technical security rating is 22% dangerous, however you should also read the user reviews.

Recommended: Identify SiWinAcc.sys related errors

Important: Some malware disguises itself as SiWinAcc.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the SiWinAcc.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

belongs to segate serial hard drive
SATA Hard Drive Controller Driver
SATA disk accelerator for Windows SATA drive
  Axecleaver   (further information)
I can't install windows xp home 'cause I receive a message telling me "siwinacc.sys is not founded" and then, abort the installation.
  alex, from guadalajara, mexico  
nForce4 SATA Drivers
WinXP install is asking for file but I don't have it.
  Mike Goldstein  
Silicon image SATA Accelerator
Silicon image SATA Accelerator

Summary: Average user rating of SiWinAcc.sys: based on 7 votes with 8 user comments. 7 users think SiWinAcc.sys is essential for Windows or an installed application. One user is not sure about it.

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Best practices for resolving SiWinAcc issues

A clean and tidy computer is the key requirement for avoiding problems with SiWinAcc. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the SiWinAcc.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

SiWinAcc.sys [all]