Possibility of 3 Gbits/in(2) Floppy Disk

We tried to realize Gbits/in(2) class Floppy Disk , with a magnetic layer p repared by sputtering (SP-FD), The heat-durable undercoat and the underlaye rs made magnetic layer have Gbits/in(2) properties, with higher S/N and nar rower PW50 in comparison with those of 3.1 Gbits/in(2) HD, Heat durable sub strate, fine protrusions and aerodynamics consideration allowed to achieve stable and nonaggressive contacts and good durability after running for mor e than 250 hours at three different environment conditions. We can conclude that the SP-FD has the potential of 3Gbits/in(2) FD.