Showing posts with label Memory Of Computer. Show all posts
Showing posts with label Memory Of Computer. Show all posts

Unit Of Computer Memory

Data Representation:

Computer understands all the data in the form of 0 and 1. These binary digits are called bits. When we combine 8 bits together. We call it a byte one byte can store 1 character.
  • Processor or Virtual Storage

    • 1 Bit = Binary Digit
    • 8 Bits = 1 Byte
    • 1024 Bytes = 1 Kilobyte
    • 1024 Kilobytes = 1 Megabyte
    • 1024 Megabytes = 1 Gigabyte
    • 1024 Gigabytes = 1 Terabyte
    • 1024 Terabytes = 1 Petabyte
    • 1024 Petabytes = 1 Exabyte
    • 1024 Exabytes = 1 Zettabyte
    • 1024 Zettabytes = 1 Yottabyte
    • 1024 Yottabytes = 1 Brontobyte
    • 1024 Brontobytes = 1 Geopbyt
  • Disk Storage 

  •  1 Bit = Binary Digit
  •   8 Bits = 1 Byte
  •   1000 Bytes = 1 Kilobyte
  •  1000 Kilobytes = 1 Megabyte
  •  1000 Megabytes = 1 Gigabyte
  •  1000 Gigabytes = 1 Terabyte
  •  1000 Terabytes = 1 Petabyte
  •  1000 Petabytes = 1 Exabyte
  •  1000 Exabytes = 1 Zettabyte
  •  1000 Zettabytes = 1 Yottabyte
  •  1000 Yottabytes = 1 Brontobyte
  •  1000 Brontobytes = 1 Geopby

Bit and Byte :

        Bit it is a binary digit which is an electronic signal to a computer like "0"  for OFF and "1" for ON.

Byte :

           A byte  is usually a group of eight adjacent bits operated as an unit.

Computer RAM

RAM-Random Access Memory

Full form of RAM is Random Access memory. All The Data entered into the system in directly stored in RAM.RAM is volatile memory because ,when the power is removed from the chips all the memory contents are lost . The user enters the program and data into RAM.It retains stored information as long
as the power supply is on.Its contents are lost when power supply is switch off or physically damage. Hence it is volatile in nature.Ram is three type.
  1. Static RAM (SRAM)
  2. Dynamic RAM (DRAM)
  3. Integrated RAM (iRAM)

 Static RAM -SRAM

In Static RAM (SRAM) stores information are retained in it as long as the power supply is on. It consumes more power and costly. It is very fast memory.

 Dynamic RAM -DRAM

Dynamic RAM stories its information in the  source capacitor. Due to leakage,the change on these
, usually every 2 milliseconds . The dynamic RAM consumes less power and has higher packing density. tHis RAM is slower than Static RAM (SRAM).
capacitors leaks away after a fey milliseconds. Therefore ,dynamic RAM has to be periodically refreshed

Integrated RAM(iRAM)

iRAM integrates a dynamic RAM and control and refresh circuitry in a single IC. A dynamic RAM required refresh circuitry Earlier,refresh and control circuits for a dynamic chops were on a seperate IC (known as dynamic RAM controller).

Computer Memory


Memory ram
Example of Memory
A memory is just like a human brain. It is used to store data and instructions. Computer memory is the storage space in computer where data is to be processed and instructions required for processing are stored. Normally memory is a location where we can store our required Information.
Memory is basically three types-
  • Ø      Cache Memory
  • Ø      Main memory or Internal/Primary Memory
  • Ø      Secondary Memory/External Memory/Permanent memory

Cache Memory

Since faster memories will be a tremendous help in incressing the overall seccess of a computer,concept of Cache memory developed.These are the small faster memories placed betwen the processor(CPU register)  and the main memory.Thus,small cache memories are intended to provide fast speed or memory retrial without sacrificing the size of memory.The cache memory read or write operation is first checked with cache ana if the desired location data is available in cache then used by the CPU directly.Because of locality of reference ,cache performs better.

Main memory or Internal/Primary Memory

 This memory accessed direct by the processor. It is mainly based on Integrated circuits (IC).Main memory or primary memory consists of semiconducttor memory chips and is used to store the data and programs currently in use.primary memory basically  are two type-
  • RAM(Random Access Memory)
  •  ROM(Read Only Memory)

  Secondary Memory/External Memory/Permanent memory

  Secondary Memory for permanent storage of data.As it has been discussed in the main memory that the cost of RAM is very high and the semiconductor RAMs are mostly volatile(Temporary ) so,it is highly likely that a secondary cheeps media should be used which should show some sort of permanence of storage and should be relatively inexpensive.
  • Floppy Disk
  • Hard Disk
  • CD-ROM disk etc

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