I was buying this card from the market. The card was very good for a few days, Writing & reading speed are 8-13 mbps & 28-31 Mbps and 29 Gb is more than enough.But after some time the speed of the card decreased and after 2-3 month Writing & reading speed decreased to 3-6 mbps and 12-16 mbps which was very bad and after some time when I moved any data, it used to be blank. and also if I captured pic. it also used to show blank.