Micro sd card received in time. Used on my raspberry pi + b for a mediacenter, it did the trick. Read 50MB / s and write 20mb / s (I found several files copied from the card to the PC (play) and the PC to the card (writing) knowing that I have a hybrid hard drive that is relatively fast . So write speed and good but not exceptional. For the price this is a very good map !! Very Satisfied!