Sony introduced the 3..5 inch disk to the world in 1981 but the disks did not become popular until the 1990s. Sony has been one of the last major manufacturers to continue shipments of the disk type they helped develop as most other manufacturers stopped making them in the past few years. Sony actually stopped manufacturing 3.5 inch floppies last year but has been selling inventory left in the warehouses. Apparently, that inventory is now dwindling. In its announcement, Sony noted the demand, or a lack thereof, as the reason for discontinuing manufacture and sales.