Process or task name:
Always double check your task spelling if you are concerned about spyware or viruses, as often they use similiar spelling for these windows processes and tasks: usbstor.sys
Misc file type - Not an exe or dll file, but still could be an executable if it is an activex file, script, etc.
Purpose of this file:
USBSTOR.SYS was most likely on your pc when you first purchased it. Always verify the exact disk and folder location as shown below, as this helps verify it is not spyware or virus related (by making sure its not a copied name just placed in other odd locations). This is a system driver file and it goes by the name USB mass storage driver, and it is from Microsoft. This file is considered safe, it is not virus or spyware related.
Visit usbstor.sys for complete information on this task or process.
If you would like help on other tasks or processes, you can view the entire process and task directory here.
What is the usbstor.sys location, where is it stored on my computer?
C:\windows\system32\DRIVERS\USBSTOR.SYS is where this is found in your hard drive.