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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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