First of all I am not sure if the product i received is a CLASS 10 memory card. The reason why i say this is that the maximum write speed i get on my WINDOWS 8 system is 1.4 MB/Sec. Also i have issues with my system recognizing the card and i do frequently receive 'Disk Cannot Be Formatted' error.I am totally dissatisfied with this product considering the fact that i have a brand new laptop, Do not recommend SANDISK please check other brands.