If you have windows XP with SP2, then you can disable the writing option to USB drives. This trick is very useful if you have virus in your computer and want to copy files from a USB Drive but don’t want to transfer virus to the USB. Follow the given steps to disable the USB writing option:

To edit the computer registry, first you should log onto your computer with administrative rights.

First click on Start button and type “Regedit” in Run option.

then go to HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Control
Here in right side panel, click right to create a key with the name “StorageDevicePolicies”.

Now in left side panel, select “StorageDevicePolicies” key, again right click to create new DWORD value then label it “WriteProtect”. Set its value to “1″. But again to enable writing, set its values to “0″.

Now close the registry editor and restart your computer after any changes to go into effect.