What is a Kilobyte? Megabyte? Gigabyte? Terabyte?

Posted On 2007-04-12 by dwirch
Tags: General Tutorial Glossary 
Views: 7037

Computers and storage mechanisms (CD-ROMs, hard drives, USB flash drives, DVD-ROMs, etc.) need to hold much larger values than what a byte can hold (0-255). Thus, the terms kilobyte, megabyte, gigabyte, and terabyte were created to represent such large amounts of information.

The definition of a kilobyte is 1,024 bytes; however many people think of it as 1,000 bytes.

The definition of a megabyte is 1,024 kilobytes; however many people think of it as 1,000 kilobytes.

The definition of a gigabyte is 1,024 megabytes; however many people think of it as 1,000 megabytes.

The definition of a terabyte is 1,024 gigabytes; however many people think of it as 1,000 gigabytes.

Why the confusion? There are two numbering systems in play. Strictly in "computerese", a base 2 system is in play, so that one kilobyte is 2 to the power of 10 bytes, or 1024 kilobytes. However, many hardware manufacturers, including hard drive manufacturers think of a kilobyte as only 1,000 bytes, or 10 to the power of 3 bytes.

This is the same with megabytes, gigabytes, and terabytes, and that is why when you buy a hard drive with, for example, 400 gigabytes, you may not be getting exactly the amount of room that you think!

About the Author

dwirch has posted a total of 190 articles.

Comments On This Post

No comments on this post yet!

Do you have a thought relating to this post? You can post your comment here. If you have an unrelated question, you can use the Q&A section to ask it.

Or you can drop a note to the administrators if you're not sure where you should post.

Your IP address is:

Before you can post, you need to prove you are human. If you log in, this test goes away.

Code Links