Make Write Protection Your Flash-Drive

Goto-->Run, then type regedit
Navigate to the following Registry
key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\
Look at the sub-keys and see if a key named StorageDevicePolicies is listed। If it is skip this paragraph and read the next. If it is not create the key by right-clicking Control and selecting New > KeySee if there is an entry named WriteProtect. It can be easily created if it is not present by right-clicking in the right window and selecting New > DWord from the menu. The following values are allowed for this entry:

0 - This will allow write processes on USB Flash Drives
1 - This will block write processes on USB Flash Drives.