1.2 Memory Revision

  • Created by: IssaJ
  • Created on: 14-11-19 13:22
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  • 1.2 Memory
    • Primary Storage
      • RAM (Random Access Memory)
        • Volatile
          • When it loses power, everything on it gets wiped.
        • It holds the current running programs and operating system.
        • Virtual Memory
          • When RAM gets full, it uses virtual memory.
            • Virtual memory is memory taken off secondary storage, such as a hard drive, and is used as a slower RAM
        • Much faster than secondary storage
        • There are different types of RAM.
          • SRAM - Static Random Access Memory
          • DRAM - Dynamic Random Access Memory
      • ROM (Read Only Memory)
        • It is the memory that comes with the motherboard, to boot up the computer.
        • Non-Volatile
          • It can keep data, even without a source of power.
      • It is the main memory where data and information are stored temporarily.
    • Secondary Storage
      • Refers to external memory, where data is stored permanently.
      • Mechanical
        • a hard disk drive uses a mechanical arm with a read/write head to move around and read information from the right location on a storage platter.
        • An example of this is magnetic disks, magnetic tape
        • Slower than flash memory, but isn't relatively slow.
        • Relatively cheap compared to others.
      • Flash Memory
        • a solid-state chip that maintains stored data without any external power source.
        • Tunneling electrons change the gate's electronic charge in "a flash" (hence the name), clearing the cell of its contents so it can be rewritten.
        • USB flash drives, MP3 players, digital cameras and solid-state drives.
      • Optical
        • Optical storage, electronic storage medium that uses low-power laser beams to record and retrieve digital (binary) data.
        • Compact Disk, DVD, HD-DVD, bluray.Holographic Data Storage System (HDSS)Laser turntable.
        • Very cheap, and is bought in large quantities.
    • CPU
      • he electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logic, controlling, and input/output operations specified by the instructions.
      • Control Unit
        • a component of a computer's central processing unit (CPU) that directs the operation of the processor.
        • It tells the computer's memory, arithmetic and logic unit and input and output devices how to respond to the instructions that have been sent to the processor.
      • ALU (Arithmetic Logic Unit)
        • An arithmetic logic unit (ALU) is a digital circuit used to perform arithmetic and logic operations. It represents the fundamental building block of the central processing unit (CPU) of a computer.
      • Cache
        • Cache memory is a small-sized type of volatile computer memory that provides high-speed data access to a processor and stores frequently used computer programs, applications and data.


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