Some desktop pc computer cases include a SATA drive dock (Example: https://pics.computerbase.de/6/4/8/7/6/6-1080.3861619362.jpg ).
Or you can buy internal docks (Example: Amazon.com )
However it would be great if framework would offer solutions where you can for example replace an insertable / internal BD-player (Does the Framework allow for a pluggable or insertable DVD player) with an internal (sata) dock. (Example: Picture )
I like this solution: Icy Dock FlexiDock MB511SPO-1B 1 x 2.5" SATA SSD/HDD for Ultra Slim ODD Bay
It should contain one ejector system which allows you to change SSDs or HDDs quickly.
And you should have physical On/Off Switches and or a key locking mechanism like it is shown on the website.