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BitLockerがONのPCでUSBメモリの書き込み禁止を解除する

After hunting on the internet, I found this.
http://www.group-policy.com/ref/policy/2866/Deny_write_access_to_removable_drives_not_protected_by_BitLocker

These two settings are mentioned on that site.
HKLM\System\CurrentControlSet\Policies\Microsoft\FVE!RDVDenyWriteAccess
HKLM\Software\Policies\Microsoft\FVE!RDVDenyCrossOrg

The RDVDenyWriteAccess was set to 1, but the RDVDenyCrossOrg was set to 0. After disabling RDVDenyWriteAccess, I pulled out my usb drive and re-inserted it. And I could write to it again!!!