I’m a new owner of a RB5009.
Since I retired my old CRS309-1G-8S+IN, container limitations..
I didn’t want to dangle a usb drive of it with a usb cable .
So, I went this route.
Since there is no space to connnet a usb stick (m.2)
I bought this
90 degree up usb adaper
https://www.amazon.com/dp/B0BVJXN99B?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
And for the drive itself. I purchase this
BUFFALO External SSD 2TB
https://www.amazon.com/dp/B09XS1972J?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
So far it seems to be working well.
Just sharing to other that are looking for a usb drive for their RB5009