Human: What is the difference between a floppy and a hard disk? Assistant: 
A floppy disk is a type of data storage device that uses magnetic storage. It has a thin, flexible plastic shell that contains a circular metal plate with a magnetic coating. The metal plate is divided into many small areas, each representing one bit of data. Floppy disks are read by a computer's disk drive mechanism using a head that moves over the surface of the disk. Hard disks are similar to floppy disks except they have no moving parts. Instead, data is stored on rotating platters coated with a magnetic material.