Quick Answer
The answer is RAID 1. This RAID level, known as mirroring, writes identical data to two or more drives simultaneously, so if one hard drive fails, the other contains a complete, bootable copy of all data, resulting in zero data loss. For the CompTIA ITF+ FC0-U61 exam, this question tests your understanding of fault tolerance versus performance; a common trap is confusing RAID 1 with RAID 0, which stripes data for speed but offers no redundancy. The exam often presents a scenario where a company needs to ensure no data loss on a single drive failure, and the correct choice is always RAID 1 because it provides an exact duplicate. To remember this, think of a mirror: what you see on one side is perfectly reflected on the other, so if one breaks, the reflection remains intact.
This FC0-U61 practice question tests your understanding of infrastructure. 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 company wants to ensure that if one hard drive fails, no data is lost. Which RAID level should be implemented?
RAID 5
Why wrong: RAID 5 provides redundancy but requires 3+ drives.
RAID 1
RAID 1 mirrors data, so one drive can fail without loss.
JBOD
Why wrong: JBOD has no redundancy.
RAID 0
Why wrong: RAID 0 has no redundancy.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
RAID 1
RAID 1 (mirroring) writes identical data to two or more drives simultaneously, so if one drive fails, the other contains a complete copy of all data, resulting in zero data loss. This directly meets the requirement that no data is lost upon a single hard drive failure.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
RAID 5
Why it's wrong here
RAID 5 provides redundancy but requires 3+ drives.
RAID 1
Why this is correct
RAID 1 mirrors data, so one drive can fail without loss.
Related concept
Read the scenario before looking for a memorised answer.
JBOD
Why it's wrong here
JBOD has no redundancy.
RAID 0
Why it's wrong here
RAID 0 has no redundancy.
Common exam traps
The trap here is that candidates often confuse RAID 5 as the 'standard' fault-tolerant RAID and forget that RAID 1 is the simplest and most direct solution for zero data loss with a single drive failure, especially when the question does not specify a minimum number of drives or performance requirements.
Detailed technical explanation
RAID 1 operates by duplicating every write operation to each member disk, so the usable capacity is only that of a single disk (e.g., two 1 TB drives yield 1 TB of usable space). In a real-world scenario, RAID 1 is often used for operating system drives or critical databases where write performance is less critical than immediate failover, and it can be implemented via hardware RAID controllers or software RAID (e.g., mdadm on Linux).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 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
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FAQ
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
The correct answer is: RAID 1 — RAID 1 (mirroring) writes identical data to two or more drives simultaneously, so if one drive fails, the other contains a complete copy of all data, resulting in zero data loss. This directly meets the requirement that no data is lost upon a single hard drive failure.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This FC0-U61 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U61 exam.
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