Quick Answer
The answer is RAID 1. This RAID level is the correct choice for ensuring data redundancy against a single drive failure because it uses disk mirroring, writing identical data simultaneously to two or more drives. If one drive fails, the system seamlessly continues operating using the mirrored copy, providing full fault tolerance with no data loss and minimal downtime. On the CompTIA ITF+ FC0-U61 exam, this concept tests your understanding of basic RAID levels and their purposes; a common trap is confusing RAID 1 with RAID 0, which offers striping for performance but no redundancy. Remember that RAID 1 is all about protection through duplication—think “1 for one-to-one mirroring.” For a quick memory tip, associate the number 1 with a single mirror reflection: if one side breaks, the other side keeps the image 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 data redundancy in case of a single hard drive failure. Which RAID level should they use?
RAID 0
Why wrong: RAID 0 stripes data without parity, offering no redundancy.
RAID 5
Why wrong: RAID 5 provides redundancy but requires three or more drives and is not the simplest choice for single drive failure.
JBOD
Why wrong: JBOD simply spans drives without redundancy.
RAID 1
RAID 1 mirrors data across two drives, providing fault tolerance for a single drive failure.
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, providing full data redundancy. If one drive fails, the system continues to operate using the mirrored copy, ensuring no data loss and minimal downtime. This makes RAID 1 the correct choice for protecting against 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 0
Why it's wrong here
RAID 0 stripes data without parity, offering no redundancy.
RAID 5
Why it's wrong here
RAID 5 provides redundancy but requires three or more drives and is not the simplest choice for single drive failure.
JBOD
Why it's wrong here
JBOD simply spans drives without redundancy.
RAID 1
Why this is correct
RAID 1 mirrors data across two drives, providing fault tolerance for a single drive failure.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse RAID 5 as the 'standard' redundancy option due to its efficiency, but the question specifically asks for redundancy in case of a single drive failure with no mention of capacity optimization, making RAID 1 the simplest and most direct answer.
Detailed technical explanation
RAID 1 operates by duplicating every write operation to all member disks, which means the usable capacity is equal to the smallest disk in the array (e.g., two 1 TB drives yield 1 TB usable). Under the hood, the controller or software driver handles read requests by reading from any available disk, which can improve read performance in some implementations. In a real-world scenario, RAID 1 is often used for boot drives or critical system volumes where simplicity and immediate failover are more important than capacity efficiency.
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, providing full data redundancy. If one drive fails, the system continues to operate using the mirrored copy, ensuring no data loss and minimal downtime. This makes RAID 1 the correct choice for protecting against 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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