Q: The wifi on my macbook air disconnects when I connect my external hard disk on the left usb port. How to rectify this problem?

When I connect my external hard disk to the left usb port the internet doesn't work anymore however, it shows that it is connected to the home network but when i disconnect and try to reconnect again it never works. There is no wifi problem when I try to connect same external hard disk to the usb port on the right side of my macbook air !!