1. Click Start > type CMD in search bar and press Enter key and a black background small window will open with white font colours
2. Now type diskpart Over there . Press enter
3. Now again type List Disk and hit enter
4. Now write your usb disk number.number
of the USB HDD which you have plugged in your computer.( you can find
your usb disk number by right click on your usb drive in window explorer
and then click on Hardware )
5. Now type again Attributes disk clear read only clear Randomly and hit enter .
let the process began for 2-4 seconds.