I've been searching and trying to find SSD for a long time and I found this small external SSD. It's amazingly fast and I tested the speed by copying files to this SSD. It only took me about 1 second to move a bunch of large PDF files. I've had it for over a week now so far so good. What I also like is that it is very small and easy to carry. And it even fits in my wallet easily and I will buy it again.
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