Summary: I have used this flash drive on 3 different laptops - all high-end laptops and fairly new. I cannot even come close to getting the advertised write speeds that Lexar claims. I emailed their support group which asked some very basic questions and then told me to return the product. $20 later, I get the replacement and the same results. The latest information I have from Lexar is to contact Microsoft to get the latest USB drivers. Can you believe that?