Primary storage: Main memory or internal memory, Data is directly accessed by processing unit, Data operated and stored in uniform manner., These memory devices are more expensive than secondary devices., Nature of parts of primary memory varies. RAM -volatile in nature. ROM - Non volatile., RAM, This memory has limited storage capacity., ROM, PROM, EPROM, Registers, Cache memory, Secondary storage: Known as External memory or Auxiliary memory., Data is first transferred to main memory and then routed to processing unit., Magnetic disk, optical disks are used to store information in secondary memory., Information stored is permanent unless one deletes it intentionally., Data stored is not uniform., These memory devices are less expensive., It is little slow in interacting with micro processor., Whereas this memory can store bulk amounts of data in a single unit., Magnetic Tapes, Optical Disc, Floppy Disk, Flash memory(USB drives), Paper Tape, Punched cards,
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Primary and Secondary Storage
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