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
- When RAM gets full, it uses virtual memory.
- Much faster than secondary storage
- There are different types of RAM.
- SRAM - Static Random Access Memory
- DRAM - Dynamic Random Access Memory
- Volatile
- 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.
- RAM (Random Access Memory)
- 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.
- Primary Storage
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