I bought 2 of them and unfortunately didn't try them right away. I managed to save some documents from the Mac to one, but after two more inserts into the USB port it stopped working. The other doesn't work either and has never worked. It's too late to return them, but they're rubbish! To update. Even though the Revain return period has passed, the seller Aneew was kind enough to give me a full refund, so thanks to them!
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