Troubleshooting USB drive permission help

[blueblackwow65]

Hi Just today I plugged up my usb hard drive with 3 partitons on it.I needed to go to one of the partitions to get to my backup folder ,where I was greeted with a "You don't currently have permission to access this folder." I then click continue and I get "You have been denied permission to access this folder". This happens with every folder on the partition and the whole Usb drive.I have tried changing permisions under security tab put it to everyone under there also ,etc. I can't get access any way around this? Thks