Abstract
This chapter discusses secondary storage of the computer system. Secondary storage is external storage device, which is less expensive and larger, but slower to access than main storage. There are several secondary storage devices, such as tapes and disks. The tape can receive information that is output from the computer or it can provide information to be input by the computer. Tape is also used for batch-processing applications in which large amounts of data are processed on each run. Data is placed on tape so that it may be retrieved and placed in main storage as needed. Speed is often a major concern in accessibility of data. The data transfer rate is the number of characters per second that may be transferred between main storage and a particular secondary storage device. Transfer rates with tape depend on the density and speed in inches per second of the tape drive. Floppy disks, sometimes called flexible disks or diskettes, can store between a few hundred thousand and several million characters of information.
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