"I would imagine that each physical drive would appear as a directory under the virtual drive." – Just mount each filesystem at a separate subdirectory of some main directory. Then the main directory would be your "virtual drive". I would understand your need for "one USB drive" if you wanted a single filesystem where you can store file(s) larger than any HDD involved. My point is your concept of "each physical drive as a directory" obviously cannot do this, it is limited regardless if there are multiple mounts or "one USB drive". So why to require the latter?
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