Question 317 of 750

macOS Features and Tools →mediumMultiple ChoiceObjective-mapped

Why Your Mac Shows a Prohibitory Symbol After SSD Upgrade

This 220-1202 practice question tests your understanding of macos features and tools. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 technician is troubleshooting a Mac that fails to boot and displays a prohibitory symbol (a circle with a slash). The user had recently installed a new third-party SSD. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The SSD is formatted as NTFS
Why wrong: While macOS cannot boot from NTFS, the installer would not show the prohibitory symbol; it would show a folder with a question mark.
B
The SSD is not properly connected or is incompatible with the Mac’s storage controller
Incompatible or improperly connected drives prevent macOS from loading, shown by the prohibitory symbol.
C
The user’s home folder is corrupted
Why wrong: Home folder corruption affects user login, not the kernel boot process.
D
The Mac’s NVRAM needs resetting
Why wrong: NVRAM reset can fix some boot issues, but the prohibitory symbol usually indicates a deeper hardware or driver problem.

Full breakdown with real-world context →

Quick Answer

The answer is that the most likely cause is the new third-party SSD is either not properly connected or is incompatible with the Mac’s storage controller. This is because the prohibitory symbol boot error indicates macOS was found on the drive but cannot load, often due to a missing or incompatible partition map, file system, or firmware—common issues when a non-Apple SSD lacks the proper formatting or controller support, especially on Macs with a T2 chip or Apple Silicon. On the CompTIA A+ Core 2 220-1202 exam, this question tests your ability to distinguish between a missing OS (folder with question mark) and a found but unloadable OS (prohibitory symbol), a classic trap where technicians might incorrectly suspect a dead drive. A useful memory tip: the prohibitory symbol means “stop—OS found, but can’t run,” so always check connection and compatibility before blaming the drive itself.

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

✓

The SSD is not properly connected or is incompatible with the Mac’s storage controller

The prohibitory symbol indicates that the Mac cannot locate a valid operating system on the startup disk. Since the user recently installed a third-party SSD, the most likely cause is that the drive is either not properly connected (e.g., loose SATA or NVMe cable) or is incompatible with the Mac's storage controller (e.g., using a PCIe 4.0 SSD in a Mac that only supports PCIe 3.0, or a non-Apple NVMe drive lacking the required firmware for macOS). This prevents the Mac from reading the boot loader or system files.

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.

✗
The SSD is formatted as NTFS
Why it's wrong here
While macOS cannot boot from NTFS, the installer would not show the prohibitory symbol; it would show a folder with a question mark.
✓
The SSD is not properly connected or is incompatible with the Mac’s storage controller
Why this is correct
Incompatible or improperly connected drives prevent macOS from loading, shown by the prohibitory symbol.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The user’s home folder is corrupted
Why it's wrong here
Home folder corruption affects user login, not the kernel boot process.
✗
The Mac’s NVRAM needs resetting
Why it's wrong here
NVRAM reset can fix some boot issues, but the prohibitory symbol usually indicates a deeper hardware or driver problem.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Candidates often mistakenly think the prohibitory symbol is caused by file system format (like NTFS) or software corruption, when in fact it is almost always a hardware or firmware-level incompatibility preventing the drive from being recognized as bootable.

Trap categories for this question

Command / output trap
While macOS cannot boot from NTFS, the installer would not show the prohibitory symbol; it would show a folder with a question mark.

Detailed technical explanation

How to think about this question

When a Mac boots, the EFI firmware scans for a valid GUID Partition Table (GPT) and a bootable HFS+ or APFS volume with a compatible boot loader (e.g., boot.efi). A third-party SSD may lack the necessary NVMe controller support or have a non-standard command set that the Mac's SMC or storage controller cannot initialize, causing the firmware to display the prohibitory symbol. In real-world scenarios, this often occurs with aftermarket NVMe drives that require a specific firmware update or a custom kext (e.g., NVMeFix) to work reliably on older Macs.

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.

Quick reference

Access Control Model Comparison

Model	Acronym	Who Controls Access?	Best For
Discretionary Access Control	DAC	Resource owner	Small teams, file shares
Mandatory Access Control	MAC	System / security labels	Classified govt / military
Role-Based Access Control	RBAC	Administrator (via roles)	Enterprise environments
Attribute-Based Access Control	ABAC	Policy engine (user + resource attributes)	Fine-grained, dynamic policies
Rule-Based Access Control	RuBAC	System rules / ACLs	Firewall rules, network ACLs

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: The SSD is not properly connected or is incompatible with the Mac’s storage controller — The prohibitory symbol indicates that the Mac cannot locate a valid operating system on the startup disk. Since the user recently installed a third-party SSD, the most likely cause is that the drive is either not properly connected (e.g., loose SATA or NVMe cable) or is incompatible with the Mac's storage controller (e.g., using a PCIe 4.0 SSD in a Mac that only supports PCIe 3.0, or a non-Apple NVMe drive lacking the required firmware for macOS). This prevents the Mac from reading the boot loader or system files.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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