I bought from DHgate.com (China) Samsung 64GB microSD card.
After 3.7GB my files became corrupted. I figured out that my card is fake. You can see my blog about that fake card.
Don't buy any electronic items from DHgate.com if they have well-know brand name. With well-known brand name all items are fake:
SD cards have wrong volume or reading/writing speed.
SD card readers have very low transfer rate speed.
Headphones will be broken after 2-3 weeks.
Cellphones will have half of original functions.
Auto electronics will show wrong measurements.
And so on...
Monetary Loss: $141.