1. The amount of storage needed on a typical Microcomputer system might be greater than the storage space available in the Main memory. This requires the use of backing storage devices, which can be used to store large quantities of information.
2. Whatever is in memory is lost when the computer is switched off. Thus, there is a need to store programs & data in secondary storage devices from which it can be retrieved when needed.
3. Primary storage is expensive, thus the need for secondary storage devices which are cheaper.
Kavungya answered the question on April 2, 2019 at 08:17
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April 2, 2019
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