Lesson 9 - Computer Memory

A Computer can remember lots of thing because of memory unit. You can put a lot of number into a computer memory. You can also put number of names, jokes, program etc. into memory. Memory stores all your data and arranges it in alphabetical order by default.

Volatile Memory -

Volatile memory are named to that memory devices which needs power to maintain the stored information. Most of a volatile memory is made of a semiconductor like S-RAMs or D-RAMs (Random Access Memory).

Non-Volatile Memory -

Non-Volatile memory are named to that memory devices which don't needs power to maintain the stored information. Some Example of Non-volatile Memory are -

• Flash Drive - commonly called Pen drive. (Secondary Storage devices.)


• Hard Drive - Inbuilt in a CPU cabinet for storing data, like movies, song, games, etc. also a secondary stage devices.


• Floppy Disk - Also known as Compact Disk or CD. Act like a secondary storage media with a lower capability of storage, up to 750 megabytes. DVD comes with up to 4 GB storage capacities. Now a day’s memory units are measured in Megabytes or in Gigabytes. Apart from these, others measurement unit are Terabytes, Petabytes etc.

Higher are memory in a computer gives you the Higher Performance. Memory is also divided into 2 sectors Primary or Temporarily Storage such as Random Access Memory (RAM) or a Secondary or Permanent Storage like Read Only Memory (ROM).

Some Memory unit is describing below -

Bit - It’s a logically 0 & 1 represent a passive or a active stage of component in an electric circuit.

Nibble - A word used to describe a group of 4 bit.

Byte - Group of 8 bit is known as Byte, which represents the data or character.

1 Byte = 8 bit
1 Kilobyte = 1024 bytes
1 Megabyte = 1024 Kilobytes
1 Gigabyte = 1024 Megabytes
1 Terabyte = 1024 Gigabytes
1 Petabyte = 1024 Terabytes

Hello friends !! Aghori here again, How are you ? Hope you learnt much about Memory Unit. Make sure you make your notes for better understanding. Now you are ready to go ahead.

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