We are all human beings. We have got extraordinary power to remember
and forget things. We also recognize things. All these functions are
performed by our brain. Brain has got special neurological cells to
store what we see, listen and think, temporarily or permanently.
Whenever we start talking about the computers, we come across the
term computer memory. The computer memory also is like memory cells
in our brain. However, we classify computer memory in terms of its
storing capabilities. Since it is manmade, it requires different types
of memory for storing, executing programs and for performing computations.
Basic memory types :
Basically, there are two types of memories co-exists in the world
of computers. They are Random Access Memory and Read Only Memory.
The Random Access Memory is used for storing programs, data etc. when
the computer is powered ON. The Read Only Memory is a memory where
the programs and data won’t get erased, even if we switch off
our computer system. Both RAM and ROM are in the form of IC chips
(Integrated Circuit chips). Out of it, RAM is volatile form of memory
and whereas ROM is of Non volatile form.
Types of RAM :
According to technical usual terminology, the RAM has got two types.
One is the static and the other one is the dynamic RAM. Static RAM
is made of flip-flops. Static RAM’s are expensive to produce,
but, is quite faster than Dynamic RAM. Static RAM is used as a cache
memory. Dynamic RAM on the other hand made out of transistors and
capacitors. Single capacitor and a single transistor pairing form
a memory cell. Basically, Dynamic RAM is used as the main memory in
ROM types :
Now, let us see about the ROM types. In ROM category, we find three
types. The ROM itself, EPROM (Erasable Programmable Read Only Memory),
EEPROM (Electrically Erasable Programmable Read Only Memory). While
ROM is non-erasable, its other two variants are erasable. Some special
hardware is needed to erase and rewrite data in EPROM and EEPROM.
The ROM is normally used to store startup routines such as Hardware
testing routines, RAM testing routines and BIOS routines.
Age of CD's DVD's USB drives : openning a new chapter in computer storage device history
The competence and advancement of technology has caused a hot wave
in computer science history. Within a short span, it has grown to
such an extent that, today we are witnessing CD’s, DVD’s,
Blu-Rays, USB drives and MicroSD cards. The last two are the combo’s
of both RAM and ROM.
The MicroSD card and USB drives uses memory chips to store the data.
It makes use of compressing mechanism to store more data. The data
stored in EPROM’s. EPROM’s enable one to erase the data
and also maintain data while not connected to power source or to a
working computer system.
The types specify the actual uses of memory. It classifies and breaks
memory management into many categories. This will help one to do research
and development activity by choosing specific category.