Chapter 2

How Computers Store Data: Notational Systems

If you don’t understand notational systems and character mapping, you’ll be baffled when dealing with network configurations, color settings, drive sizing, and most other IT topics. This chapter covers CompTIA IT Fundamentals+ Objective 1.1: Compare and contrast notational systems: binary, hexadecimal, and decimal notational systems, and data representation including ASCII and Unicode character mapping.

Foundation Topics


Binary notation is the fundamental building block of all computer operations and data storage. Binary uses only two digits: 0 (off) and 1 (on). Binary notation is also known as base 2 notation. Each character in a binary number equals a bit (binary digit). To count ...

Get CompTIA IT Fundamentals+ FC0-U61 Cert Guide now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.