Why Does Read and Write Speed Matter With SD Cards?

I am going to buy a new SD card, and when I did the research, many people suggested that I should consider the read and write speed while choosing. Why Does Read and Write Speed Matter With SD Cards? Can somebody provide detailed information?

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Roxanne· Answered on Apr 19, 2024

In response to your question, I will first introduce the basic information about the Secure Digital card. SD Card is a non-volatile flash memory card format developed for use in portable devices, divided into four categories - SD, SDHC, SDXC, and SDUC. Many users will choose SD cards by following the large capacity. However, the truth is that reading and writing speed matters just as much as capacity. A higher-speed SD card can improve your gaming experience and even make taking high-resolution photos and videos possible.

Regarding the SD speed, there are three speed classes: Speed Class, Ultra-High-Speed Class (UHS), and Video Speed Class (V). Among them, UHS is the most practical and useful speed standard that people widely use. If you want to check the read and write speed of your SD cards to see which class it is, you can run DiskMark of EaseUS Partition Master. This tool can help you scan and analyze SD cards' read and write speed efficiently.

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Here are the steps that teach you how to use DiskMark from EaseUS Partition Master:

Step 1. Launch EaseUS Partition Master and go to the "Discovery" section.

Step 2. Click the blue download logo to activate the "DiskMark" tool. Use the drop-down box to choose the target drive, test data, and block size.

Step 3. Tap the "Start" button on the right side to begin the disk test. 

The report page will show the Sequential and Random read/write speed, I/O, and Delay data, from which you can estimate your SD card's maintenance. If you want to go further about the speed of SD cards, you can read the below article that is about the SD card speed class:

More Information: What Are SD Card Speed Class

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