What about tape? Tape cartridges are high volume, inexpensive and the drives can be found on eBay or similar for under $200. They don't do random access in an

What about tape? Tape cartridges are high volume, inexpensive and the drives can be found on eBay or similar for under $200. They don't do random access in any sort of reasonable time, but can be great for archival work. Also, isn't there at least thirty years of development roadmap on the books for tape?