Elgindy USB Protector will allow you to protect your USB drives by rendering them read-only.

This portable USB drive tool will keep other users from modifying or adding any new files outside a designated public folder. USB protection is essential for guarding against infection, and unintended file deletions. Having a tool such as this one can prevent these issues from occurring. It configured intuitively making the process as simple as possible. All you need to do is choose the detected drive from the drop-down menu and select what you want to do. Elgindy USB Protector gives you the option to format the device and changed its label. You can add a public folder if desired, allowing other users to save files.

Once you have protected a USB drive with Elgindy USB Protector, you will be the only one permitted to make file modifications because access is specific to the original PC on which the protection was initiated.