| Primary Memory |
Secondary Memory |
| 1. The primary memory is categorized as volatile & nonvolatile memories |
1. The secondary memory is always a non-volatile memory. |
| 2. They are also called internal memory. |
2. This is known as Backup memory or Additional memory or Auxiliary memory. |
| 3. it can be accessed by the data bus. |
3. It is accessed by I/O channels. |
| 4. It is costlier than secondary memory. |
4. It is cheaper than primary memory. |
| 5. it is faster to read/write operation. |
5. It is slower to read/write operations. |
| 6. It is directly accessible to the CPU |
6. It is not directly accessible to the CPU. It requires primary memory for this operation. |
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