USB is disabled from GPO but in few machine USB is still enabled

Hi,
There are few machine on which USB is disabled by group policy but still if i plug in a USB pen drive then its gets connected and gets displayed on desktop. Many times i have updated the the gpo on the machines by gpresult /force cmd and restarted the machine
but still it doesn't work. USB disbaled policy are applied on the this machine and this is confirmed by generating the RSoP and gpresult /h report.html or gpresult /r /scope computer. The usbstr.inf and usbstr.pnf (something like this) permission are only
for system and no privileged permission are given for any user.
Is any thing remaining to check. What else is need to do to block the USB ports.
Thanks for helping.

Hi,
Before going further, I am sorry for the late response.
Based on your description, it is that we also need to remove the local SYSTEM account access
permissions to the Usbstor.pnf and Usbstor.inf files.
Regarding how to disable USB storage devices, the following article and thread can be referred to for more information.
How can I prevent users from connecting to a USB storage device?
http://support.microsoft.com/kb/823732
Block USB drive via Group Policy but keyboard, mouse, printers will work
http://social.technet.microsoft.com/Forums/windowsserver/en-US/9708947c-8c7b-4c68-907a-03d13b4b0a99/block-usb-drive-via-group-policy-but-keyboard-mouse-printers-will-work?forum=winserverGP
Best regards,
Frank Shen

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