You can press Windows + R, type cmd, and press Enter to open Command Prompt. Type diskpart in Command Prompt to open diskpart utility. Next type list disk in diskpart window, and press Enter. Type select disk *. Replace “*” with the number of the target disk. Type list partition, and type select partition *. Replace “*” with the number of the target partition. Then type attributes disk clear readonly, and press Enter. Type exit to close diskpart window.