Question 189 of 750

macOS Features and Tools →easyMultiple ChoiceObjective-mapped

How to Create a Bootable macOS Installer with Terminal

This 220-1202 practice question tests your understanding of macos features and tools. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A graphic designer needs to create a bootable macOS installer on an external SSD to deploy macOS Sonoma to multiple iMacs in the office. They have the 'Install macOS Sonoma.app' file. Which built-in macOS tool should they use to create the bootable drive?

A
Disk Utility to restore the .app file to the SSD.
Why wrong: Disk Utility can erase and format drives, but it cannot create a bootable installer from an application file. It is not designed for this task.
B
System Information to verify the SSD is bootable.
Why wrong: System Information only displays hardware and software information; it cannot create or modify bootable media.
C
Terminal with the 'createinstallmedia' command.
This is the correct built-in tool. The command syntax is 'sudo /Applications/Install macOS Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume'. It creates a bootable installer.
D
Migration Assistant to copy the app to the SSD.
Why wrong: Migration Assistant transfers user data, applications, and settings from one Mac to another. It cannot create bootable installer media.

Full breakdown with real-world context →

Quick Answer

The answer is Terminal with the createinstallmedia command. This built-in macOS utility is the official Apple method for creating a bootable macOS installer because it writes the installer application bundle to a target volume and automatically makes it bootable, which is essential for deploying macOS Sonoma across multiple iMacs. On the CompTIA A+ Core 2 220-1202 exam, this question tests your knowledge of macOS deployment tools and often appears as a trap where candidates mistakenly choose Disk Utility—which can only erase and format drives, not create installer media—or System Information, which lacks this capability entirely. To remember this, think of the command’s name: createinstallmedia literally means “create installer media,” and you run it in Terminal, not through a graphical interface. A helpful mnemonic is “Terminal Types the Tool,” reinforcing that the command line is the correct path for building bootable macOS installers.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Terminal with the 'createinstallmedia' command.

The correct tool is Terminal with the 'createinstallmedia' command because it is the built-in macOS utility specifically designed to create a bootable installer from the 'Install macOS Sonoma.app' file. This command writes the necessary boot files and installer data to the target volume, ensuring the external SSD can boot and install macOS on multiple iMacs.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Disk Utility to restore the .app file to the SSD.
Why it's wrong here
Disk Utility can erase and format drives, but it cannot create a bootable installer from an application file. It is not designed for this task.
✗
System Information to verify the SSD is bootable.
Why it's wrong here
System Information only displays hardware and software information; it cannot create or modify bootable media.
✓
Terminal with the 'createinstallmedia' command.
Why this is correct
This is the correct built-in tool. The command syntax is 'sudo /Applications/Install macOS Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume'. It creates a bootable installer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Migration Assistant to copy the app to the SSD.
Why it's wrong here
Migration Assistant transfers user data, applications, and settings from one Mac to another. It cannot create bootable installer media.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may think Disk Utility can create a bootable installer by simply restoring the .app file, but Disk Utility cannot interpret an application bundle as a bootable source; only the 'createinstallmedia' command properly writes the installer's bootable structure.

Detailed technical explanation

How to think about this question

The 'createinstallmedia' command, located inside the 'Install macOS Sonoma.app' bundle at /Contents/Resources/, erases the target volume, creates a hidden 'macOS Install Data' folder, and copies the installer's boot kernel, BaseSystem.dmg, and other critical files. This process ensures the external SSD uses Apple File System (APFS) or Mac OS Extended (Journaled) with a GUID Partition Map, which is required for booting Intel-based Macs. In a real-world deployment scenario, you can use the '--volume' and '--nointeraction' flags to automate the creation across multiple SSDs without user prompts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 220-1202 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 220-1202 question test?

macOS Features and Tools — This question tests macOS Features and Tools — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Terminal with the 'createinstallmedia' command. — The correct tool is Terminal with the 'createinstallmedia' command because it is the built-in macOS utility specifically designed to create a bootable installer from the 'Install macOS Sonoma.app' file. This command writes the necessary boot files and installer data to the target volume, ensuring the external SSD can boot and install macOS on multiple iMacs.

What should I do if I get this 220-1202 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

1 more ways this is tested on 220-1202

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. During a macOS deployment, you need to create a bootable USB installer for macOS Sonoma to upgrade multiple iMacs. You have the 'Install macOS Sonoma' app in the Applications folder. Which command-line tool should you use to create the installer?

medium

A.diskutil
B.asr
✓ C.createinstallmedia
D.hdiutil

Why C: The `createinstallmedia` command is the official Apple tool for creating a bootable USB installer from the 'Install macOS Sonoma' app. It is located inside the app bundle at `/Applications/Install macOS Sonoma.app/Contents/Resources/createinstallmedia` and is specifically designed for this purpose, ensuring the USB drive is properly formatted and the installer is written correctly for UEFI boot.

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