A nibble is a group of 4 bits, which is half a byte.

A byte is a group of 8 bits. One byte can hold a single ASCII character.

How are the mebibyte, gibibyte and tebibyte related to one another?

A mebibyte (MiB) is 1,024 KiB and a gibibyte (GiB) is 1,024 MiB. A tebibyte (TiB) is 1,024 GiB.

Why does a 1 MiB file hold more than 1,000,000 bytes?

A mebibyte is 1,024 × 1,024 = 1,048,576 bytes. A megabyte, the decimal unit, is exactly 1,000,000 bytes.

Why is storage measured in binary multiples?

Memory and storage are addressed in binary, so capacities come in powers of 2. A binary multiple such as 1,024 = 2¹⁰ fits that structure exactly.

Edexcel GCSE Computer Science 1CP2

Computational Thinking

Topic overview Decomposition, abstraction and subprograms Algorithms, flowcharts and pseudocode Operators and trace tables Logic errors, test data and efficiency Searching and sorting algorithms Truth tables

Data

Topic overview Binary, states and unsigned integers Two's complement Binary addition, overflow and shifts Hexadecimal ASCII and the limits of binary representation Bitmap images Sound sampling Storage units, file sizes and compression

Computers

Topic overview Von Neumann architecture and the fetch-decode-execute cycle Secondary storage: magnetic, optical and solid state Embedded systems Operating systems Utility software and robust software Low-level and high-level languages and translators

Networks

Topic overview LANs, WANs and the structure of the internet Wired and wireless connectivity and network speed Network protocols The four-layer TCP/IP model Bus, star and mesh topologies Network security and protection

Issues and Impact

Topic overview Environmental impact of digital devices Personal data: privacy, ownership and consent Artificial intelligence, machine learning and robotics Intellectual property: copyright, patents, trademarks and licences Malware, hacking and social engineering Protecting digital systems and data

Problem Solving with Programming

Topic overview Readable code, debugging and testing Selection and loops in Python Data types, conversion, variables and constants String handling Lists, two-dimensional lists and records Keyboard input, screen output and CSV files Validation and authentication in Python Operators, functions and variable scope Turtle graphics

Data

Storage units, file sizes and compression

3 things to know
Paper 1

Overview

Bits, nibbles and bytes, kibibytes, mebibytes, gibibytes and tebibytes with worked conversions, and lossless and lossy compression including run-length encoding.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

What is a nibble?

Key term

What is a byte?

Numbers

How many bytes are in a kibibyte?

Questions from this subtopic

Each one with the model answer underneath.

1
What is a nibble?
Model answer
A nibble is a group of 4 bits, which is half a byte.
2
What is a byte?
Model answer
A byte is a group of 8 bits. One byte can hold a single ASCII character.
3
How many bytes are in a kibibyte?
Model answer
A kibibyte (KiB) is 1,024 bytes. The figure 1,024 is 2¹⁰.
4
How are the mebibyte, gibibyte and tebibyte related to one another?
Model answer
A mebibyte (MiB) is 1,024 KiB and a gibibyte (GiB) is 1,024 MiB. A tebibyte (TiB) is 1,024 GiB.
5
Why does a 1 MiB file hold more than 1,000,000 bytes?
Model answer
A mebibyte is 1,024 × 1,024 = 1,048,576 bytes. A megabyte, the decimal unit, is exactly 1,000,000 bytes.
6
Why is storage measured in binary multiples?
Model answer
Memory and storage are addressed in binary, so capacities come in powers of 2. A binary multiple such as 1,024 = 2¹⁰ fits that structure exactly.

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A kibibyte (KiB) is 1,024 bytes. The figure 1,024 is 2¹⁰.

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