How to test the speed of an SD card on Windows 10

SD cards are mostly used by cameras; they are small but come in a medium-sized storage configuration that allows many large, RAW images captured by the camera to be saved. Eventually an SD card will remain connected to a desktop computer to save, process or restore the images.

SD cards have a fast transfer speed and some are faster than others. The distance depends largely on the type and manufacturer of the card you are purchasing.

SD card test speed

An SD card is a storage device that connects to a computer through a card reader. This is usually an indoor device although external ones can also be connected.

Since an SD card does not connect to a computer via a USB port or an internal port, the transfer speed will not be the same as when you read / write files to a device connected to those ports.

To check the speed of SD card, you need an app. We recommend that you use AJA System Test.

  1. Download and install AJA System Test.
  2. Run the app.
  3. From the left-hand column, expand Target Disk.
  4. Select the disk ie, the SD card.
  5. Click on Start.

  1. Let the read and write tests to complete.
  2. The distance for each one will tell you how quickly data can be read and written to SD card.

Slow speed SD card

SD card speed can be much lower than advertised. This has to do with a number of things such as the speed of the SD card reader you are using, the file system on which the SD card is formatted, and the size of the files being moved.

In general, you can get a fast card reader for better / faster transfer speeds. It may or may not work. In terms of file system, all file systems have the same transfer speeds, however, if you are moving a large number of small files, it is best to have the SD card on NTFS .


You will often find that an SD card delivers a slower speed on a computer. Its speed is usually advertised for the type of devices SD card is used on ie camera. With cameras, you can again see a slight difference in distance as not all cameras are the same. Older cameras may not be able to take advantage of an SD card that supports faster transfer speeds.

The post Demonstrate how to test SD card speed on Windows 10 first on TechtricksNg.

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