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I/O Management

_ os controls all i/o devices

_ Preferable to have the same interface for all i/o devices (device independence)

Secondary Storage Management

_ Secondary storage { An extension of primary storage

·        Must hold vast amount of data permanently

·        Main memory is too small to store all needed programs and data permanently

·        Main memory is volatile storage device

·        Magnetic tape

         _ Quite slow in comparison to main memory

         _ Limited to sequential access

         _ Unsuitable to provide random access needed for virtual memory