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Types of Computer Memory you know

It is an internal storage area in the computer system. The term Memory is used for physical memory, which refers to the actual chips capable of holding data. There is also a virtual memory, which expands physical memory onto s hard disk. There are two types of memory use in Computer primary and secondary.


1. Primary Memory: Every computer comes with a certain amount of physical memory, usually referred to as main memory for Example – RAM and ROM.

RAM (Random Access Memory): It is a temporary storage area utilized by the CPU. Before a program runs, the program is loaded into the memory which allow the CPU direct access to the program.

  • SRAM: Abbreviation is static Random Access Memory that is faster and more reliable than the more common DRAM (Dynamic Memory).
  • DRAM: Stand for Dynamic Random Access Memory, a type of memory used in most Personal Computers.

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ROM (Read Only Memory): Computers always contain a small amount of Read-only Memory that holds instructions for starting up the computer. Unlike Ram, Rom cannot be written to. It is non-volatile which means once you turn off the computer the information is still there.

  • PROM: A PROM is a memory chip on which data can be written only once. the difference between a PROM and a ROM (Read-only-memory) is that a manufactured as blank memory, where as a ROM is programmed during the manufacturing process.
  • EPROM: It is a special type of PROM that can be erased by exposing it to ultraviolet light. Once it is erased, it can be reprogrammed. An EEPROM is similar to a PROM, but requires only electricity to be erased.

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2. Secondary Memory: There types of memories are internal or external devices either inside or outside the Computer. It store program and data permanently. It is slower, but cheaper. Floppy disks, hard drives, CD, DVD Pen drive etc are secondary storage devices. You can not store the data in primary memory permanently and primary memory costs higher than primary memory whereas the secondary memory devices are cheaper comparatively.

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