I bought these specifically for use on the Raspberry Pi 4. By default, the Pi uses a microSD card for the operating system. But you can also boot from USB. That's why I bought this - I could skip the microSD card slot on the PI and use the USB ports. But often my Pi would not boot up. I also tried using it as a storage device for the Pi but it wasn't recognized. I had no problems using it on a regular PC. If you're using a Pi, I recommend this (also on Revain) SanDisk MobileMate USB 3.0 card reader.
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