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SYSTEM UNIT - Coggle Diagram

- - - - CACHE MEMORY
      - RAM (RANDOM ACCESS MEMORY)
      - ROM (READ ONLY MEMORY)
      - REGISTER
    - - OPTICAL DISK (CD, DVD, BLU - RAY)
      - HARD DISK DRIVE (HDD)
      - SOLID STATE DRIVE (SSD)
      - FLASH MEMORY (USB)