Usb write blocker is a small tool I created yesterday, it sets the registry keys to block write requests to USB devices. Comes usefull in several cases, in my case an unamed AV Software insisted on deleting my fuzz samples. Requires .NET 2.0 Framework.
Download USB Write Blocker
Rootkey : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
Subkey : StorageDevicePolicies
Key : Writeprotect (Boolean)