1.2 memory


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  • 1.2. Memory
    • Primary storage
      • RAM
        • Volatile
        • Random access memory
        • Stores instructions and data for programs currently running
      • ROM
        • Non-Volatile
        • Read only memory
        • Stores the BIOS
    • Secondary storage
      • Non volatile
      • Permanent
      • Magnetic
        • Magnetizes small parts of a spinning metal disc.
          • Magnetized-1 Demagnetized-0
        • Cheap, high-capacity, durable.
      • Optical
        • Optical devices use a laser tracking over pits and lands
          • Pits-1          Lands-2
      • Solid state
        • Uses transistor on/off.
          • on-1             off-0
        • Tends to have lower capacity as it is high in cost
        • Reasonably fast compared to magnetic and optical.
    • Units
      • Bit
      • Nibble
      • Byte
      • Kilobyte
      • Megabyte
      • Gigabyte
      • terabyte
      • Petabyte
    • Compression
      • Lossy
        • Original file cannot be recovered completely.
          • lower quality
        • Good for images and media files.
      • Lossless
        • Original file can be recovered completely.
        • Good for text files.

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