RAM ( RANDOM ACCESS MEMORY)

RAM ( RANDOM ACCESS MEMORY)

RAM ( RANDOM ACCESS MEMORY) as discussed in my earlier post on DIFFERENT MEMORIES OF COMPUTER it is an internal memory or main memory. It is also known as VOLATILE MEMORY. VOLATILE here simply means that the data stored in this memory is not permanent and as the power is switched off its data is also removed or washed away.now RAM can also be termed as READ AND WRITE MEMORY because simply we can read as well as write in this memory.RAM is used in the execution of different programs and since every program needs a particular amount of memory. Now for the fast working of computer it is required to have at least 512kb of memory and its size varies between 128KB to 1GB. In this memory the data is accessed randomly not sequentially and thats why it is termed as RANDOM ACCESS MEMORY. Now further this memory can simply be classified as

1.) STATIC RAM:-
this ram is made up of a device called flip-flop. FLIP-FLOP are the devices which can store the data. for eg:- A 1byte of flip-flop can store 8 bits of data. In flip-flop data is stored as voltage. But it has got limitation that only few number of flip flops can be stored on a chip and thats why its density is reduced and thats why they are not in much demand in market.

2.) DYNAMIC RAM:-
This type of RAM uses a technique of MOS-TRANSISTOR GATES. the greatest advantage of this technique is that comparatively larger number of gates can be stored. Now this memory is made up of a device known as CAPACITOR. it stores the bit as a charge. Now its disadvantage is that capacitor has got a property that its charge is being continuously lost with time now that can result in data loss. now to overcome this problem a refreshing circuit is attached along with this. Refreshing circuit simply keeps on transforming the information till it is being used. when the use gets finished or the application is turned off it stops and thus this problem is also solved.