Abstract
This chapter reviews how secondary storage differs from main storage. The chapter discusses the various types of secondary storage devices that are available, and how various secondary storage devices work. The most popular secondary storage medium in today's instant access applications is disk storage. The two most popular types of disks are floppy disks and Winchester disks. Floppy disks are also called flexible disks or diskettes. They can store between a few hundred thousand and several million characters of information. The heart of the floppy disk is a circle of magnetic material. Before the floppy disk, personal computers used cassette tapes; these were slower and less reliable than floppy disks. Bubble memory stores bits as the presence or absence of a magnetic bubble on a thin film of synthetic garnet. Bubble memory can store more information in a given space than silicon chips. They can retrieve information faster than tapes or disks.
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