220-1101 Question 255
Single answerMemory cardsA field technician is asked to copy several hours of 4K video from a customer's drone to a laptop. The drone uses a microSD card, and the customer reports that recording stops unexpectedly after a few minutes when using a newly purchased 32 GB card. The drone manufacturer specifies a minimum UHS Speed Class 3 (U3) microSD card for 4K recording. Which replacement card should the technician recommend to best resolve the issue?
- A
A 32 GB microSDHC card rated Class 10, U1
- B
A 64 GB microSDXC card rated U3
- C
A 16 GB microSDHC card rated Class 4
- D
A 128 GB SDXC full-size card rated U3 without an adapter
Show answer and explanation
Correct answer: B
Explanation
The best answer is a 64 GB microSDXC card rated U3 because it satisfies both the physical form factor and the minimum sustained write-performance requirement specified by the manufacturer for 4K recording. In real-world support scenarios, technicians should verify three things with memory cards: physical size (such as microSD versus full-size SD), capacity standard compatibility (for example, SDHC versus SDXC support), and speed rating appropriate for the workload. For video capture, the speed class matters because recording requires sustained write performance, not just peak transfer speed. SD Association guidance distinguishes legacy Speed Class ratings from UHS Speed Class ratings, and U3 is commonly required for higher-bitrate 4K video. Manufacturer documentation should always take priority when selecting a replacement card, especially for cameras, drones, and other devices that perform continuous media capture.
- A. Incorrect.
This option is incorrect. Class 10 and U1 can be sufficient for some HD video workloads, but the scenario explicitly states the drone manufacturer requires a minimum UHS Speed Class 3 (U3) for 4K recording. A U1 card may not sustain the write speeds needed, which can lead to recording interruptions.
- B. Correct.
This option is correct. A 64 GB microSDXC card rated U3 matches the physical format needed by the drone (microSD) and meets the manufacturer's stated minimum speed requirement for 4K recording. The larger capacity is also practical for several hours of high-resolution video, assuming the device supports SDXC cards.
- C. Incorrect.
This option is incorrect. A Class 4 card is too slow for 4K video recording and is well below the stated U3 requirement. In addition, 16 GB provides limited recording time for 4K footage, making it a poor choice for this use case.
- D. Incorrect.
This option is incorrect. Although U3 meets the speed requirement, the card is the wrong physical form factor. The drone uses a microSD card, and a full-size SDXC card will not fit unless the device specifically accepts full-size SD cards, which the scenario does not indicate.