Pro-tip! Don't eject your laptop from the docking station while running... when the boot disk is *in* the docking station. I thought the disk had failed when it went "read-only" and the desktop crashed. Nope, disk didn't fail, it literally disappeared! :D Whoopsie.
@popey Been there! I was trying out a way of running a machine as an OSless box and you boot off of a usb disk but I forgot you need to leave it plugged in when I needed some of the data on another machine.