Can I ask you what do you plan to add that you need 2tb ?
I have a 400gb micro sd card with SD2Vita and I have 200gb left
With like 50 vita games , all MAME games and every other retro system retroarch supports
Maybe 40 ps1 games
Psp games
I would recommend getting the SD2Vita adapter and a micro sd card 400gb to 1TB and leave the USB port empty for connecting multiple controllers in the future if you have company over or kids
Also if you travel with the pstv you won’t have to worry about that external drive