Success but oh my.....
From the trouble I had, I can only assume there are many errors in "partdisk and Readyboost".
I had to use "MiniTool partition wizard" to activate the Sandisk.
I never could get all the way thru Partdisk without some kind of error.
At this point I have a working Sandisk but Readyboost has gobbled up 117,166,080 bytes.
This is unacceptable.......
I have to admit that my knowledge of Partdisk is almost nil.