just use a flash drive. I'm not sure what the largest game is, but 64GB+ should be good enough. I have 128GB with mine. if you're going to dump games, the default setting has the system shutdown after complete, so it's best to do only one game at a time.
I have a HDD but when i plug in into one of USB port i get this.
cannot format this USB device as extended storage area. Use a USB device that meets the following requirements. USB 3.0 Newer storage capacity equivalent to minimum 250 GB, maximum 8 TB.
Thats why I'm asking which HDD or USB i shall use.
I need to expand it as a storage area and l can't do that with HDD i have.