What is stexstor?

The genuine stexstor.sys file is a software component of Promise SuperTrak EX Series by Promise Technology.
"stexstor.sys" is located in Windows and is an SAS/SATA Raid controller card driver for Promise SuperTrak EX Series cards. This kernel driver allows various applications to utilize the SAS/SATA controller and experience efficient data transfer operations from SuperTrak EX series drives. Promise Technology, Inc. began in 1988, working on intelligent IDE interfaces. They later released the first RAID controller in existence. The company’s focus is and has always been innovative storage through the use of devices, controllers, and technology. It is all designed to create efficient data transfer solutions, which includes their initial IDE drivers up to the latest in SAS/SATA solutions. They have also branched off into rich media software, cloud computing technology, and surveillance devices.

STEXstor stands for SuperTrak EX storage

Stexstor.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 stexstor.sys is a Windows system file or if it belongs to an application that you can trust.

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

Stexstor.sys file information

The process known as Promise SuperTrak EX Series Driver for Windows belongs to software Promise SuperTrak EX Series by Promise Technology (

Description: Stexstor.sys is not essential for the Windows OS and causes relatively few problems. Stexstor.sys is located in a not identifiable folder. The file size on Windows 10/8/7/XP is 0 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. It is not a Windows core file. The stexstor.sys file is a trustworthy file from Microsoft. The program is not active. The file is digitally signed. Therefore the technical security rating is 4% dangerous.

Recommended: Identify stexstor.sys related errors

Important: Some malware camouflages itself as stexstor.sys. Therefore, you should check the stexstor.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.


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Best practices for resolving stexstor issues

A clean and tidy computer is the key requirement for avoiding problems with stexstor. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the stexstor.sys process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

stexstor.sys [all]