This card reader was recognized by my Windows XP operating system and (so far) has worked perfectly every time I use it. As other reviewers have mentioned, it's wide and covers nearby USB ports, but since I'm using this card reader with no devices connected, this isn't an issue for me. There were also some concerns about the cleanliness of the contacts. The clear plastic cover slides on both sides so one side is protected and the other is not unless stored in the original bag or box. Again, this is not a problem for me. I am very satisfied with this product.
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