2.2 · Utilities & Drivers

Goal: explain the role of utility programs and device drivers, and give common examples.

Utility programs

A utility is system software that performs a specific maintenance task on the computer. Examples on the syllabus:

Utility	Function	Example software
Data compressor	Reduce file size for transfer / storage	7-Zip, WinRAR, native zip in Windows/macOS
Virus checker (anti-virus)	Detect and remove malware	Windows Defender, Bitdefender, Kaspersky
File manager	Browse, copy, move, rename	Windows Explorer, macOS Finder
Defragmentation software	Reorganise disk blocks to speed HDD access	Windows Optimize Drives (defrag for HDDs only)
System monitor	Show CPU/RAM/disk usage	Task Manager, Activity Monitor
Backup tool	Schedule and store backups	Time Machine, File History
Disk cleanup	Delete temp files, caches	Windows Disk Cleanup, CCleaner

Defrag and SSDs

Do not defragment an SSD. SSDs have no spinning platters; defragmenting wears out the flash cells without performance benefit. Modern OSes detect SSDs and run TRIM instead.

Device drivers

A driver is a small program that lets the OS talk to a specific piece of hardware.

Without driver	With driver
OS sees a generic USB device	OS knows it's a printer, can send PCL/PostScript commands
Photo button on camera does nothing	Captures a JPG and saves to disk
Bluetooth keyboard doesn't pair	OS recognises HID protocol and pairs

How drivers work

Application  ──▶ OS API  ──▶ Device driver  ──▶ Hardware

If the driver is missing or buggy, the OS can't translate generic commands into the hardware's specific protocol.

Driver sources

• Bundled with the OS (Windows Update, kernel modules in Linux).
• Downloaded from manufacturer (Nvidia, AMD, printer vendors).
• Generic / built-in (HID for keyboards, USB Mass Storage for thumb drives).

Why utilities and drivers fall under system software

Both keep the computer healthy and bridge between OS and hardware. They are not the end-user product (no spreadsheet, no game), so they sit firmly in system software territory.

Common student mistakes

• Listing a web browser as a utility — browsers are application software.
• Confusing anti-virus with firewall: anti-virus scans files; firewall filters network traffic. (Both exist, sometimes bundled.)
• Believing drivers are needed "only for old hardware" — every keyboard, GPU, Wi-Fi card needs a driver.
• Defragmenting SSDs.

Exam-style question

Q (4 marks): Define utility program and device driver, giving one example of each. Explain why both are classified as system software.

Sample answer:

A utility program is software that performs a specific maintenance or housekeeping task on the computer (example: anti-virus scanning files for malware). A device driver is software that allows the operating system to communicate with a specific hardware device (example: the printer driver translates OS print commands into instructions the printer understands).

Both are system software because they support the OS and hardware rather than directly solving an end-user problem — they make the computer usable so that application software can run.

Key takeaways

• Utility = a tool that helps run / maintain the computer.
• Driver = software bridge from OS to specific hardware.
• Both are system software, not applications.

➡️ Next: 2.3 Modes of Operation