Warning to anyone buying Samsung SD cards off of eBay. They are made in Korea, so always check the back of the card (real on the left, fake on the right) :
How to Identify a Fake Samsung Micro SD Memory Card : 8 Steps (with Pictures) - Instructables
Fake VS Real - Samsung EVO 128gb microSDXC Card - YouTube
How to Identify a Fake Samsung Micro SD Memory Card : 8 Steps (with Pictures) - Instructables
Recognize fake and original samsung micro SD
How to identify fake Samsung Evo micro SD card - YouTube