Memory
Memory classification
According to the storage media classification
The main storage media semiconductor device, magnetic, optical.
The semiconductor memory
A memory element of a semiconductor device memory composed of a semiconductor memory referred to.
The semiconductor memory with all modern VLSI chip process technology.
-
-
- Advantages: small size, low power consumption, short access time.
- Disadvantages: is a volatile memory, information is stored when the power has been lost. In recent years it has developed a non-volatile semiconductor memory material, to overcome the shortcomings volatile information.
-
The semiconductor memory according to the different materials they use, can be divided into:
-
-
- Ambipolar semiconductor memory: height.
- MOS semiconductor memory: high integration, simple to manufacture, low cost, low power consumption, it is widely used.
-
Magnetic memory
Magnetic surface of the memory
Magnetic storage surface is coated with a layer of magnetic material on the surface of the recording medium as a metal or a plastic matrix, work, carrying magnets with the magnetic layer at high speed, with the magnetic layer on the read head / write operations. It is called secondary surface memory.
Different shapes of the magnet carrier can be divided into:
A magnetic disk (magnetic circular disk mounted in a sealed box, is a hard disk).
Tape (tape recorder)
Drum (deprecated).
Features: non-volatile.
Core memory
The core is an annular element made of hard magnetic material in the core wire and through driving of appearance.