# Memory Unit

* [ ] Primary Memory
  * [ ] Random Access Memory (RAM), Read-Only Memory (ROM)
* [ ] Secondary Memory
  * [ ] Hard Disk Drive (HDD), Solid-State Drive (SSD), Pendrive, Secure Digital Card (SD Card)

## Primary Memory

* [ ] Primary Memory, or Primary Storage, or Main Memory
* [ ] Directly accessible by Processor
* [ ] Store currently used data and instructions
* [ ] Temporarily store data and instructions
* [ ] Volatile Memory: data is lost when power is turned off
* [ ] Fast Access to read and write
* [ ] High Cost
* [ ] Capacity (size in GB) is Low
* [ ] Example: Random Access Memory (RAM), Read-Only Memory (ROM)

## Secondary Memory

* [ ] Not Directly accessible by Processor
* [ ] Long-term/Permanent storage for data and programs
* [ ] Data is loaded into primary memory before use
* [ ] Non-Volatile Memory: data is not lost when the power is turned off
* [ ] Slow Access to read and write
* [ ] Low Cost
* [ ] Capacity (size in TB) is High
* [ ] Example: Hard Disk Drive (HDD), Solid-State Drive (SSD), Pendrive, Secure Digital Card (SD Card)


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