RF, Thanks for taking time to reply.
You have described my actions precisely. I guess I was hung up rationalizing the need to copy content from E: onto G:, thinking the content was really "already there".
Today I played with a pair of old 2TB HDDs and noted the same result, then copied external content onto the virtual drive and saw the effect on the Pool, as well as within the individual PoolPart.xxx folder(s) on E: and F:.
Your reply has confirmed the need to actually MOVE the content over. Thank you.
Next up, Duplication.