usbstor.sys task purpose and description:

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. (See the details below for the actual location of this file.)

Actual process or task name: (You can view alphabetical task list here)
usbstor.sys

File type:
This is a driver module

Where is this file and folder located on my computer?
C:\windows\system32\DRIVERS\USBSTOR.SYS is where this is found in your hard drive.

General information:
Be aware that many tasks will be similiar names to existing tasks or processes. You can always view the running tasks on your computer by pressing ctrl-alt-del to view the windows "task manager", and then view the "processes" tab. This will show you all tasks running or currently active on your PC. Although this shows you all running tasks, it does not show dll file thats are loaded, as they get loaded as part of other processes. Many spyware writers attempt to hide their files on your computer, for example, usbstor.sys may be intentionally misspelled to look like a similiar task, or spyware may be named very similiar to a Windows system task. The reason they do this is so you cannot easily recognize the name in your tasklist as I have mentioned above. Make sure always check the location of the file if you are concerned. You can always find the location of usbstor.sys on your computer by using your Windows search options, but I will also try to list the file location of every file described on this website, so you can verify the correct location. You can view the entire tasklist directory with the link below.

View entire task list here!