Thursday 21 November 2013

What is RAM and its types ?

04:31    1 comment

Definition and Types of RAM






Definition of RAM

Def NO.1

RAM (pronounced ramm) is an acronym for random access memory, a type of computer memory that can be accessed randomly; that is, any byte of memory can be accessed without touching the preceding bytes. RAM is the most common type of memory found in computers and other devices, such asprinters.


Def NO.2   I am sure this is best definition


Understanding RAM - RAM (Random Access Memory) is a computer hardware responsible for storing data. RAM is temporary means that stored data can be erased. Unlike the case with the ROM, ROM has duties similar to RAM but the ROM is permanent in the sense that the stored data we can not remove. RAM is a type of memory whose contents can change-change for computers that have the nature of life and can remember data or programs on condition that the electric current and can store and retrieve data very quickly.


Types of RAM

There are two different types of RAM:
  • DRAM (Dynamic Random Access Memory)
  • SRAM (Static Random Access Memory).
The two types of RAM differ in the technology they use to hold data, with DRAM being the more common type. In terms of speed, SRAM is faster. DRAM needs to be refreshed thousands of times per second while SRAM does not need to be refreshed, which is what makes it faster than DRAM.
DRAM supports access times of about 60 nanoseconds, SRAM can give access times as low as 10 nanoseconds. Despite SRAM being faster, it's not as commonly used as DRAM because it's so much more expensive. Both types of RAM are volatile, meaning that they lose their contents when the power is turned off.

RAM, Main Memory and ROM Explained

In common usage, the term RAM is synonymous with main memory, the memory available to programs. For example, a computer with 8MB RAM has approximately 8 million bytes of memory that programs can use. In contrast,ROM (read-only memory) refers to special memory used to store programs that boot the computer and perform diagnostics. Most personal computers have a small amount of ROM (a few thousand bytes). In fact, both types of memory (ROM and RAM) allow random access. To be precise, therefore, RAM should be referred to as read/write RAM and ROM as read-only RAM.





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