Its a free tip on buying a original SD card like samsung and any other brand. Points you should take care of.
She the proper branding on the card the original sd card have lighter color than the fake one.
The memory of the sd card can be increase by any software so you should format it abd the buy if the memory does not decrease after formating.
This is happend to me. I just brought a fake one and I really feel very bad about that so I think I should help some other people like me who don’t know about these facts.