WD My passport external hard disk not detecting on any system

Hi,
My hard disk was working perfectly fine when my friend did a right click on the Hard disk>properties>security tab,clicked on a group, selected advanced>owner tab>edit >other users or groups>advanced>find now>everyone>ok
After this, she again opened the properties of the WD hard disk and clicked on security>everyone>full permision>apply

After these steps , my device is not showing up. i tried on different PCs and still not working. I did right click of My computer > manage>device manager> here its showing in USB controllers as "USB mass storage device"
I tried to uninstall here and scan for hardware changes but its still the same.
Please help me...I have lots of important data in it.