How hard would it be to mass-produce and mass-market a high-capacity (1Tb) magnetic-platter disk drive with removeable magnetic disks?

Something like the old Zip Disks and Zip Drives, but with a much higher data density?

Obviously, since 1Tb removeable magnetic are not being made, there must be some limitation to this idea, what are the big limitations?

If these could be produced and sold in the millions, about how much might a 10-pack of removeable 1Tb magetic disks cost?

~ thanks for your answers ~