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.