I am coming back from a vacation and just read many list emails.
I do not think the following was mentioned.
re. solid state drives
I love my SSD. When I shut down the computer, I put my hand on my system box feeling the slight vibrations for probably 5 seconds, and then there is 'nothing'.
The patient has turned off at that time.
Warning - if you live in a cold/snowy location, take off your snow gloves before taking this action.