When you have a memory card full of images to transfer to your computer, a card reader is the best, and quickest, way to get them from A to B.

The memory card reader is a useful device that connects to the computer’s USB port, allowing images, music or video files to be uploaded from memory cards, without the need for the camera to be connected to the computer. The latest card readers now also support USB 3.0, as do the latest memory cards, making image transfer quicker as well. Some computers do have built-in memory card readers but generally, they only support one type of card and they can be slower at reading data. Using a memory card reader to move images to your computer will also be quicker than plugging your camera directly into it if your camera isn’t compatible with USB 3.0.

You obviously don’t want to be waiting for hours on end for images to be transferred so speed is important. Obviously, the faster the memory card reader is at transferring data, the quicker images will be moved from the memory card to your computer which means you’ll be editing photos or sending them via email to grandparents sooner.
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https://www.ephotozine.com/article/best-memory-card-readers-2018–5222