A common security concern at organizations is allowing users to plug in a usb flash drive, because they could so easily copy corporate data.
Since Windows XP SP2, you can disable writing to USB devices altogether using a simple registry hack. Here it is:
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlStorageDevicePolicies]
“WriteProtect”=dword:00000001
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IT engineer from Mumbai, India here to solve all your digital world problems. Enjoy hanging out with friends, loves to code and passionate about money ;). You can write to me at bas@tipsfromgeek.com. 
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where should i put this code:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies]
“WriteProtect”=dword:00000001
Navigate to the Key given here by using Registry Editor and in the right side pane create new Dword. Name it as WriteProtect and keep the dword value 1.
To re-enable USB writing make dword value 0
i have an xp sp2 after HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
I DO NOT GET Control\StorageDevicePolicies WHAT DO I DO??
Even if I make one file by the name of StorageDevicePoliciesin control and define its value to 0 or 1 by using d-word value it still works. Awating reply ASAP
Yupp, it’ll work
Just try it that way
hey thanks a lot man.
welcome mate