Icons are the base for UX (User Experience). Rapid development of technology are the reason for a lot obsolete icons.
Usually the longevity of an icon is more durable than the copied hardware. According to this the icon should be based on an operation (e. g. save) which is independent on the technical status.
Chips are well-known for everybody, hidden or visible sticked on an ec-Card. The chip is the real smallest part, which saves the data. Diskette, cd, dvd, cassette and usb-Stick are assemblies which consist of chips. Assemblies subject to technical progress.