What happens when a computer copies files to prompt the disk to be protected?

Failure phenomenon:
When you copy some files, you are prompted to say that the disk is protected.
Reason Analysis:
In a Windows 7 system, there is a feature that protects the file, which is good, but sometimes annoying, such as when you want to copy some files, and you are prompted to say that the disk is protected.
Solution:

Tip: There is a risk of modifying the registry, please proceed with caution.
1. "Win+r" Open the Run box--input regedit, enter Registry Editor;
2. After entering the Registry Editor, we find in turn: Hkey_local_machine/system/currentcontrolset/control/storagedevicepolicies project, no words to create, Right-click in the right window to create a DWORD value;
3. Name this item writeprotect and set the data value to 0;
4. Close the registry and restart the computer to see if the disk is written to protect against the error prompted by copying the data from the computer to the removable hard drive. If it still exists, then proceed to the next step;
5. Open My Computer, right button removable disk, select Properties, cut to the Hardware column, click the name contains "USB disk drive", click on the lower right of the "Properties" button;
6. In the pop-up menu to cut to the policy column, check the better performance, to determine the exit can be.