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220-1201 Practice Question: That their USB 3.0 external hard drive is…

A user reports that their USB 3.0 external hard drive is transferring data at very slow speeds, around 30 MB/s, when connected to a front-panel USB port. The same drive works at expected speeds (over 100 MB/s) on a rear USB port. Which connector-related issue is most likely?

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 front-panel USB port is only USB 2.0, limiting speed.

Front-panel USB ports are often connected via internal headers that may only support USB 2.0 speeds, especially in older cases. This tests understanding that USB 3.0 requires a blue port and proper internal cabling for full speed.

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 front-panel USB port is only USB 2.0, limiting speed.

    Why this is correct

    A USB 3.0 device connected to a USB 2.0 port will operate at the slower USB 2.0 specification speed due to backward compatibility. USB 2.0 offers a maximum theoretical throughput of 480 Mbps, significantly less than USB 3.0's 5 Gbps, thereby bottlenecking the external hard drive's potential performance. This speed negotiation is automatic, resulting in consistently slower transfers rather than errors or disconnections.

  • ✗

    The USB cable is damaged and needs replacement.

    Why it's wrong here

    A damaged USB cable typically manifests as intermittent connectivity, frequent disconnections, or complete failure of the device to be recognized by the operating system. While data corruption or transfer errors might occur, a consistently slow, but stable, transfer speed is not the primary symptom of a physically compromised cable. Such issues usually point to a negotiation problem or a speed limitation inherent to one of the connected components rather than physical damage.

  • ✗

    The external hard drive is not compatible with USB 3.0.

    Why it's wrong here

    The premise states the external hard drive functions at high speed when connected to a rear USB 3.0 port, directly contradicting the idea that the drive itself is incompatible with USB 3.0. If the drive were truly incompatible, it would either not function at all, or operate at USB 2.0 speeds regardless of the port it was connected to. Its successful high-speed operation on another port confirms its inherent USB 3.0 capability.

  • ✗

    The front-panel USB port is not receiving enough power.

    Why it's wrong here

    Insufficient power to a USB device, especially an external hard drive, typically results in the device failing to spin up, frequent disconnections, or erratic behavior, such as the drive not being recognized. While power issues can prevent a device from functioning optimally, they generally do not cause a consistent, reduced data transfer rate while maintaining stable connectivity. A consistent speed limitation points to a bandwidth bottleneck rather than a power delivery problem.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 220-1201 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 220-1201 exam.