Floppy disks have been in use for decades and have served us well. They can hold 1.44 megabytes of information and are more or less infinitely re-writeable. (Till they inexplicably de-format themselves just when you need them most).

New computers today are usually sold without floppy drives. This can be annoying if you have been saving data on floppies. Why should you give it all up? Well, maybe you shouldn