The other day I tested a few "32GB" microSD cards that I had gotten from Wish - and they all returned only the first block - which was unreadable. So why did I buy them? The card plus the reader were cheaper than buying the same reader just as a reader. (Go figure the psychology of that one.) The cards are either 16KB (which I can't format in Windows, and I don't want to reboot to Linux) or they're just defective. (I could report them as defective to Wish - they issue refunds with no problem - but I got what I wanted, so it wouldn't be honest. [I really didn't expect 32GB cards for the price. Maybe 64KB working cards, but they would have gone into a little plastic case as "defective but they fill the slot anyway" cards, which they still do.])