Computer Memory

Memory

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.
Like-

• Floppy Disk
• Hard Disk
• CD-ROM disk etc

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