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| Parameter | Primary memory | Secondary memory |
| Nature | The primary memory is categorized as volatile & nonvolatile memories. | The secondary memory is always a non-volatile memory. |
| Alias | These memories are also called internal memory. | Secondary memory is known as a Backup memory or Additional memory or Auxiliary memory. |
| Access | Data is directly accessed by the processing unit. | Data cannot be accessed directly by the processor. It is first copied from secondary memory to primary memory. Only then CPU can access it. |
| Formation | It's a volatile memory meaning data cannot be retained in case of power failure. | It's a non-volatile memory so that that data can be retained even after power failure. |
| Storage | It holds data or information that is currently being used by the processing unit. Capacity is usually in 16 to 32 GB | It stores a substantial amount of data and information. Capacity is generally from 200GB to terabytes. |
| Accesses | Primary memory can be accessed by the data bus. | Secondary memory is accessed by I/O channels. |
| Expense | Primary memory is costlier than secondary memory. | Secondary memory is cheaper than primary memory. |
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1975 Cricket World Cup Final. The final of the 1975 ICC Cricket World Cup was played in Lord's, London on 21 June. West Indies defeated Australia by 17 runs to lift the first ever World Cup Trophy. West Indies was captained by Clive Lloyd and Australia by Ian Chappell.
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