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What is usbstor?


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

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

Usbstor.sys file information

The process known as USB Mass Storage Class Driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).

Description: The original usbstor.sys is an important part of Windows and rarely causes problems. Usbstor.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 8/7/XP are 26,496 bytes (80% of all occurrences), 26,368 bytes or 76,288 bytes. http://www.file.net/process/usbstor.sys.html 
The driver can be started or stopped from Services in the Control Panel or by other programs. The file is a Windows system file. The program is not visible. Usbstor.sys is a Microsoft signed file. The service has no detailed description. usbstor.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous, however you should also read the user reviews.

Recommended: Identify usbstor.sys related errors

Important: Some malware disguises itself as usbstor.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the usbstor.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.

Score

User Comments

Driver for a six-in-one storage card reader (external)
   
Microsoft's driver for USB interface with storage devices.
  Jason F.  
i neden windows 98 se dont have it it says that is in precopy1.cab
  52  
USB
  SSSAAA  
This has to be the most bug ridden file that microsoft have ever released :@ my version re-sets my computer every time its loaded apart from when i insert an empty card reader 1st.
  Ugg  
windows\\system32\drivers\usbstor.sys
  cy  
Reading it from the hard drive during startup holds up my boot times by about 15 seconds.
  Raymond Lee MSc  
cuz im missing it and i need it, to run my camera-usb driver
  Aimerz  
It's used to enable or disable USB storage devices for System Admins.
  Scott  
It likes to break sometimes when you update Windows.
  /cx  
It is used for USB storage devices lke external hardrives and is stored in %sysfolder%\system32\drivers
  Kevin Balenzuela   (further information)
I have an usb storage devise it's new but I can't format it or do any other action
  boby  
My USB flash disk does not detect on my computer
  Inno  
It's a process that contros USB flash drives and external hard drives
  ds4a  
usbstor driver for windows xp
  joe  
Avast Found it Virus
  AdDude  
scanned it with F-secure and USBSTOR shutted it down.
   

Rating chart

Summary: Average user rating of usbstor.sys: based on 28 votes with 17 user comments. 21 users think usbstor.sys is essential for Windows or an installed application. 2 users think it's probably harmless. 2 users think it's neither essential nor dangerous. One user suspects danger. 2 users think usbstor.sys is dangerous and recommend removing it. 4 users don't grade usbstor.sys ("not sure about it").


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Best practices for resolving usbstor issues

A clean and tidy computer is the key requirement for avoiding problems with usbstor. 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 doing a repair of your installation, or in the case of Windows 8, 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 usbstor.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

usbstor.sys [all]