OCR J277 Systems Software

Lesson 5: Utility Software

Maintaining and optimizing the computer system.

Lesson Progress

0/5
01 Review of Previous Learning

DO NOW: Systems vs Utility

We've spent 4 lessons on the **Operating System**. Now we look at **Utility Software**. What is the difference? Select the best definition below.

Option A

Software designed for the user to perform tasks like writing letters or playing games.

Option B (Correct)

"Extra tools designed to help maintain, optimize, or repair the computer system."

Important: Utility software often comes bundled with the OS, but it is technically a separate "utility" to perform a specific housekeeping task.
02 Introducing the New Objective & KWs

Context & Keywords

Learning Objective

To explain the purpose and functionality of encryption, defragmentation, and compression utility software.

Tier 3 Vocabulary (Click to flip):

Encryption Click to enlarge

Scrambling data into an unreadable format using a key, so unauthorized users cannot read it.

HELLO

X9f2!L

Click to close
Defrag-
mentation Click to enlarge

Reorganizing data on a magnetic hard drive so that file parts are stored in contiguous blocks.

"Faster Read Speeds."

Click to close
Compression Click to enlarge

Reducing the file size of data so it takes up less space and can be transmitted faster.

10MB
2MB
Click to close
03 New Learning

Utility Functions Explained

1. Defragmentation

Files are split into parts to fit on a hard drive. Over time, these parts scatter (**Fragmentation**).

Why it matters:

  • Fragmented drives take longer to read as the read-head has to move more.
  • Defragmenting reorganises files into contiguous blocks.
  • Impact: It reduces physical read-head movement, making file access faster.
  • Note: SSDs do not need defragging (and it can actually damage them!).

BEFORE: [A][ ][B][A][C][B][ ][C]

AFTER: [A][A][B][B][C][C][ ][ ]

2. Data Compression

Lossy Compression

Removes data permanently to shrink size (e.g. MP3, JPEG). Quality is reduced.

Lossless Compression

Shrinks size without losing any original data (e.g. ZIP, PNG). Quality is 100% preserved.

04 Application

Independent Task & Exam Practice

Task 1: The Utility Lab

  • Open the Utility_Lab.html link.
  • Defragment the magnetic drive to reach 100% efficiency.
  • Compress the server log files using Lossless compression.
  • Encrypt the customer data file with a 128-bit key.
  • Screenshot your completed "Maintenance Report" and paste it into your Google Doc.

Task 2: Exam Question

Answer the following 4-mark OCR exam question in your Google Doc.

"A user notices that their computer is taking a long time to open files stored on their hard disk drive. Explain how the user could use a utility program to improve the performance of their hard disk." (4 Marks)
05 Consolidation

Plenary: Which Utility?

"I need to email a 50GB folder to a client."

Compression

"I am selling my old PC and want to ensure my bank details can't be read."

Encryption

"My magnetic hard drive is clicking and slow when reading large files."

Defragmentation

Unit 1.5 Complete!

You've mastered User Interfaces, Memory, Peripherals, Management, and Utilities.

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