The answer is that the boot order in BIOS is not set to the new SSD. This is the most likely cause because when a new SATA SSD is installed, the system’s BIOS/UEFI firmware still defaults to the previous boot device—often an old hard drive or a disconnected drive—so it fails to locate the operating system on the new SSD, triggering the “Operating System Not Found” error. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of the POST process and boot sequence configuration; a common trap is assuming the SSD is faulty or the cables are loose, but the drive itself is usually detected correctly in BIOS. Remember the memory tip: “Boot order before blame”—always check the boot priority list first before troubleshooting hardware.
220-1101 Storage Devices Practice Question
This 220-1201 practice question tests your understanding of storage devices. 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 user reports that their computer will not boot and displays an 'Operating System Not Found' error. They recently installed a new SATA SSD and connected it to the motherboard. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The boot order in BIOS is not set to the new SSD.
If the boot order is not set to the new SSD, the system may try to boot from another drive or nothing, causing the error. The SSD itself is likely fine, and cables are usually detected if properly connected.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 SATA cable is faulty.
Why it's wrong here
A faulty cable would typically cause the drive not to be detected at all, not just a boot error.
✗
The SSD is not compatible with the motherboard.
Why it's wrong here
Most SATA SSDs are universally compatible with SATA ports; incompatibility is rare.
✓
The boot order in BIOS is not set to the new SSD.
Why this is correct
If the system tries to boot from an old drive or network, it will fail if the OS is only on the new SSD.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The SSD needs to be formatted before use.
Why it's wrong here
An unformatted drive would still be detected; the OS would not be found only if the OS is not installed.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
Storage Devices — This question tests Storage Devices — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The boot order in BIOS is not set to the new SSD. — If the boot order is not set to the new SSD, the system may try to boot from another drive or nothing, causing the error. The SSD itself is likely fine, and cables are usually detected if properly connected.
What should I do if I get this 220-1201 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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