Introduction to Data Storage Device CSE Seminar Topic:

A data storage device is a device for storing and retrieving information. Electromagnetic data may be stored in either an analog or digital format, Most of electrically processed storage media are of two types Volatile (which losses data when power is lost) and Non-Volatile (store data permanent).

Storage Hierarchy can be subdivided into 4 types,

  • Primary Storage (Main Memory or Internal Memory)

   Primary memory is one which can be directly accessible by processor, Ram (Random access memory) are used for primary memory which is an volatile memory, Ram is directly or indirectly connected to the central processing unit via a memory bus. It is actually two buses (not on the diagram): an address bus and a data bus. As ram is volatile (cleared at startup) computer needs to store a startup program which should be a non-volatile i.e. BIOS, used to is used to bootstrap the computer, which is also called as Rom (Read only memory)

  • Secondary Storage ( External Memory or Auxiliary storage)

   Secondary storage does not lose the data when the device is powered down it is an non-volatile memory, we use magnetic and optical  device to store data such as hard disk, cd/dvd. They have longer access time compared to primary memory. Some other secondary drive are flash drive or EEPROM (eg: USB disk), floppy disks, magnetic tape, paper tape, punched cards

  • Tertiary Storage

  Tertiary memory involves robotic mechanism which will mount (insert) and dismount removable mass storage media into a storage device according to the system’s demands; this data is often copied to secondary storage before use.

  • Of Line Storage

  Which is an storage device which is not under the control of processing unit, which can be disconnected of dismounted after the use. 

Some of the other storage techniques are

  • Vaccume tube memory
  • Electro Acoustic Memory
  • Phase Charge Memory
  • Holographic Data Storage
  • Molecular Memory

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