My pleasure

The only thing that I am aware will do this, is the new microsoft windows home server (iirc) which sees all drives you install in the box as one single huge storage facility.

Or, a dedicated NAS solution which is more advanced that the "home user" ones, but as I said, they don't come cheap since they are essentially professional tools.

Your next problem will be data safety which RAID does help with, at the expense of storage space. Backup is an altogether different matter.

Question: Do you really need to keep all this data