Bits vs Bytes - The Confusion!
Part of Storage Units — GCSE Computer Science
This key facts covers Bits vs Bytes - The Confusion! within Storage Units for GCSE Computer Science. Revise Storage Units in Memory & Storage for GCSE Computer Science with 15 exam-style questions and 18 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 9 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 9
Practice
15 questions
Recall
18 flashcards
Bits vs Bytes - The Confusion!
Why Two Different Units?
- Bits (b): Used for data TRANSMISSION (network speeds, download speeds)
- Bytes (B): Used for data STORAGE (file sizes, disk capacity)
The 8:1 Rule:
Since 1 byte = 8 bits, you divide by 8 to convert:
- 100 Mbps internet: 100 ÷ 8 = 12.5 MB/s actual download speed
- 1 Gbps fiber: 1000 ÷ 8 = 125 MB/s actual download speed
Example Calculation:
You have 50 Mbps internet. How long to download a 500 MB file?
Step 1: Convert Mbps to MB/s: 50 ÷ 8 = 6.25 MB/s
Step 2: Divide file size by speed: 500 MB ÷ 6.25 MB/s = 80 seconds