How can I mark my USB storage devices as read-only?

可以讀 USB 不能寫 USB

Q. How can I mark my USB storage devices as read-only?

A. Windows XP Service Pack 2 (SP2) introduces a new registry subkey that lets you mark USB-based storage devices such as memory sticks as read-only devices. This is a useful security capability that can prevent users from copying data from their systems and taking that data offsite via a USB device. To enable the USB write protection, perform the following steps:

1. Start the registry editor (regedit.exe).
2. Navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies subkey. (Create the StorageDevicePolicies subkey if it doesn't already exist.)
3. From the Edit menu, select New, DWORD Value.
4. Type the name WriteProtect and press Enter.
5. Double-click the new value and set it to 1. Click OK.
6. Close the registry editor.
7. Restart the computer.

To disable this change, you can either set WriteProtect to 0 or delete it.

Microsoft article : “Step-By-Step Guide to Controlling Device Installation and Usage with Group Policy”

http://www.microsoft.com/technet/windowsvista/library/9fe5bf05-a4a9-44e2-a0c3-b4b4eaaa37f3.mspx