Not sure that this works with such drives. Looks like you are using an external hard drive not a usb flash drive. Get a 8, 16 or 32 gig usb flash drive and give it a try.
That being said run up gparted and find the external hard drive. Since it is 128 gig you should see an unallocated portion about 124 gig.Remember you must have another linux operating system to work on your drive. You cannot use the operating system installed on the flash drive you are adding the persistence feature to. We offer a tutorial in these forums on how a windows only user can install persistence to a flash drive. You need to make two live flash drives and use one live flash drive to work on and add the persistence feature to the other flash drive.
See
https://forums.kali.org/showthread.p...istence+window
