Binary language is used to store information on the computer. In the binary language, 0 and 1 digits are used. The measuring unit of computer memory in kilobytes(KB).

The measuring units of computer memory are as follows.

0 or 1 = 1 Bit
8 Bit = 1 Byte
1024 byte = 1 Kilobyte (KB)
1024 Kb = 1 Megabytes (MB)
1024 MB = 1 Gigabyte (GB)
1024 GB = 1 Terabytes (TB)

When you are working on a computer, you save the typed information so that you can get that information later. Which you want later. If you do not save information in the computer, you will not be able to get it later.

You should know where & how this information is saved on a computer

One of the important features of the computer is its storage capacity.

Information Is Stored on the Computer in Two Ways.

1. Primary Storage
2. Secondary Storage


Primary Storage is a temporary form. So the information in the primary storage is stored for a while.An example of primary storage is RAM. RAM chips are installed inside the system unit.

The information stored in RAM is temporarily relevant. Eg When the computer is turned off suddenly while working on the computer, the data you typed once you start the computer again is not available.Because that data is stored in RAM. And the data is destroyed if the computer is turn off suddenly Because RAM temporarily stores information. Therefore, while working on your computer, your data should be saved from time to time.


Secondary storage is permanent. This means that information in secondary storage is not destroyed.

Some examples of secondary storages are as follows.

1.Hard Disk


A hard disk is an example of secondary storage. This means that the information stored on the hard disk is permanent. While working on a hard disk.

2. Pen Drive

Pen drive is used to move data from one computer to another computer

3.Optical Disk

The most commonly used optical discs are as follows.
3.Blu Rey

The Three Basic Formats of the Optical Disc Are Followed As

1. Read Only Memory(ROM)
The information in this type of CD is readable only. You cannot change it.Eg. You get movies, songs, CDs on the market. The data of which you can only read. You cannot change it. Such CDs are called as C D. ROM

2. Write Once (R: Recordable)
You get blank CDs from the market. In which you can record information once. Such CDs are called CD recordable. Once you have recordable the information on this CD, you cannot change it.

3. Rewritable (RW)
C.D. Rewritable are also blank CDs. But we can record information in this CDs again & again. Therefore, Such CDs are called CD RW.

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