`The difference between Primary memory and secondary memory are:
| Primary memory | Secondary memory |
| Primary memory is temporary. | Secondary memory is permanent. |
| Data stored in primary memory can be directly accessed by the CPU. | which cannot be accessed in secondary memory. |
| Primary memory is a semiconductor memory | secondary memories are magnetic and optical memories. |
| The speed of data accessing in the primary memory is faster | The data accessing speed of the secondary memory is slower.. |
| Primary memory is volatile, which means it is wiped out when the computer is turned off. | Since it is non-volatile, data can be retained in case of a power failure. |
| Primary memory can be accessed by the data bus. | Secondary memory is accessed by I/O channels. |
| It is expensive in comparison to secondary memory | It is less expensive in comparison to primary memory. |
| RAM, ROM, Cache memory, PROM, EPROM, Registers, etc. Examples | Hard Disk, Floppy Disk, Magnetic Tapes, etc. Examples |
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