Pros: Works very well. The description says the device works with 32-64GB cards, but I'm using it with a 128GB card and haven't had any problems so far. 128GB Samsung micro SD card via this unit, both connected to a USB 3.0 SATA docking station. I then installed this unit into Dell and it booted fine, runs smoothly and sees the 128 card as a hard drive. Cons: They aren't free. Conclusion: This review was written on a computer running a card in one of these devices. I also make mounts so I can mount this unit on the machine so I can access the card slot on the front of the machine. This allows me to easily switch operating systems before booting the machine. I've just ordered two more micro SD cards from another brand with the same specs to see if it works with other brands. I'll update this review over time to report any problems or successes, maybe even try some 256GB cards.
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