Hallo Benny!   
      
   After foraging cyberspace I found this -> X850 V3.0 expansion board, which is   
   a bottom mounted msata adapter manufactured for raspi's, although it looks to   
   me to be more suited to rock64's which happen to have USB3.  However they are   
   compatible to USB2 so that shouldn't be an issue.  Looks to be a very   
   attractive alternative to the current onboard µSD as an msata drive is   
   reported to be far more capable as boot devices for a number of good reasons.    
   Same with 2.5" SSD's and regular spinney drives on a powered usb to sata   
   adapter which is what I am currently deploying on aarch64-raspi3b+-linux-gnu   
   target.   
      
   Het leven is goed,   
   Maurice   
      
   ... Een Møøse beet ooit in mijn zus ...   
   --- GNU bash, version 5.0.2(1)-release (x86_64-pc-linux-gnu)   
    * Origin: Little Mikey's EuroPoint - Ladysmith BC, Canada (2:280/464.113)