Computer Memory
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Computer Memory
Computer memory is used to store data and instructions that the CPU uses during processing. It is classified based on volatility, speed, and purpose.
1. Primary Memory (Main Memory)
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Volatile memory used for temporary storage while programs are running.
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Directly accessible by the CPU.
| Type | Description |
|---|---|
| RAM (Random Access Memory) | Stores data and instructions temporarily; lost when power is off. |
| Cache Memory | High-speed memory between CPU and RAM; stores frequently used data. |
| ROM (Read-Only Memory) | Non-volatile; stores permanent instructions like BIOS. |
| PROM / EPROM / EEPROM | Programmable ROMs for firmware updates; EPROM and EEPROM can be erased and rewritten. |
2. Secondary Memory
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Non-volatile storage for permanent data.
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Examples: Hard drives, Solid State Drives, Optical Discs, USB drives.
3. Tertiary / Offline Memory
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Used for backup, archival, and large-scale storage.
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Examples: Magnetic tapes, External storage, Cloud storage.
4. Characteristics of Computer Memory
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Speed: Determines how fast the CPU can access data.
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Volatility: RAM is volatile; ROM and secondary storage are non-volatile.
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Capacity: Amount of data memory can hold.
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Cost: Faster memory (like cache) is more expensive per MB than slower memory.
Key Points
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Primary memory is fast but temporary; secondary memory is slower but permanent.
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Cache memory boosts processing speed.
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ROM stores essential system instructions, while RAM stores currently used programs and data.
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Proper memory management is critical for computer performance.
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