USB removable device is not accesable

Hi,
we have one win 7 machine on which USB pendrive is not accesable. When we insert the pen drive it gets detected and is dispayed on my computer as a drive H:\ . But when i double click on it it shows access denied.
We have NOT blocked USB devices From GPO or any AV.
Permission to to USBSTOR inf/pnf and Reg values all troubleshooting are done. I have aslso uninsttaled the drivers and resatrted machine this many time. I have also tried with Administrator login.
1. Please let me know what more needs to be done?
2. How to give permission to this H:\ USB drive. Because in security policy it shows To Dont Have permission and Blanked. Even i can not take ownership.

Hi,
So here we could not change the ownership of the USB drive? In addition to the USBSTOR value, please also take a look at this registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\RemovableStorageDevices
More details, please click here:
How to Deny or Allow Access to All Removable Drives in Vista and Windows 7
If issue insists, then please take a try to share this drive, follow this steps:
1. Right click the drive.
2. Select Properties.
3. Press the Sharing Tab.
4. Select Advanced Sharing.
5. Put a check on "share this folder".
6. Press Permissions now that it is clickable because you put a check on share this folder box.
7. Under "Group or Usernames" there should be a default option of everyone. If it does not show this for you, press add and type Everyone.
8. Check all 3 boxes under Allow [full control, change read].
Hope this may help
Best regards
Michael Shao
TechNet Community Support

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