In Win7, the disk protection tutorial is removed. Sometimes, when you need to copy and paste local files to a USB flash drive or a mobile hard disk, the system will prompt that the disk is write-protected and the file copy cannot be completed. I have summarized a set of good solutions through my collection and demonstration on the Internet. I will share the following with you. I believe many people will be very depressed in this situation! Solution steps: 1. "Win + R" Open the run box -- enter regedit to go to the Registry Editor; 2. after entering the Registry Editor, find the HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ StorageDevicePolicies project. If not, create the project by yourself. Right-click the project in the right window and create a DWORD Value. 3. name this item WriteProtect and set the data value to 0; 4. close the registry, restart your computer, and check whether the disk write protection error message will appear when you copy data from the computer to the removable hard disk. If it still exists, perform the next step. open my computer, right-click the removable disk, select Properties, switch to hardware, click disk drive with the name "USB", and click "properties" in the lower right corner. 6. in the pop-up menu, switch to the policy column, check for better performance, and click OK to exit.