Review on SanDisk Ultra MicroSDXC Memory Adapter Accessories & Supplies by Clint Miller

Beware of counterfeit cards. The capacity listed on counterfeit cards may be altered to show a larger size than the actual size. former. Fake 256GB card, only 32GB instead. An uninformed person could use the card without knowing it's fake and find that the data got corrupted when it exceeded 32GB, or experience a very, very slow transfer rate after a certain point. To check if the card you bought is real or not, use FakeFlashTest. (fast) and H2testw (slower but thorough). This will erase the contents of your card. So backup everything you have before using them. Attached are the speeds and pictures I got from my legitimate 256GB card. Your results may vary. Product code removed due to product support issues.