I prefer ssd - here's what mine's installed on: https://smile.amazon.com/gp/product/B073H4GPLQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/Samsung-T5-Portable-SSD-MU-PA2T0B/dp/B073H4GPLQ/ref=sr_1_2?keywords=samsung+t5+2tb&qid=1573253800&sr=8-2