Some months back I was going to send a computer in repair.  I discovered 
there is no program to clear an SSD.   

Some years ago I was reading about how an SSD did wear leveling, and 
recovered from errors.  The article claimed that often the SSD came with 
more memory than was listed.  If, in the course of normal operations if 
found a bad section, it would somehow mark that area for "Do Not See or 
Use" and use the extra, secret memory space to do the work that was for the 
disabled section.

I am guessing it is just that in normal operations for Qubes OS, such 
trivia does not matter.  Don't let the evil power groups get their hands on 
the SSD.   Then the potential loss of data is pretty small.   Unless the 
SSD firmware can be tricked out in some way.

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