How to Deny write access to USB mass storage devices?

As described in my previous post for disabling USB mass storage, this option is exceptional case were you need to allow USB mass storage for specific remote users. Below is the simple approach to deny write access on USB mass storage.
To prevent users from being able to write to USB disks follow these steps:

1. Open Registry Editor.

2. In Registry Editor, navigate to the following registry key:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\StorageDevicePolicies
Note: This key might not exist. In that case simply create it as a new key under the parent key.

3. Right Click and Create the following value (DWORD):
WriteProtect
and give it a value of 1.

Note: As always, before making changes to your registry you should always make sure you have a valid backup. In cases where you're supposed to delete or modify keys or values from the registry it is possible to first export that key or value(s) to a .REG file before performing the changes.

4. Close Registry Editor.
Done!

Note: When you try to write something to any USB Disk and you'll get the following error as “Media Write Protected”