My 10+ year old Dell 15n (1545 that runs Mint 17.01 now, but came with Ubuntu 8.04 when it was new) sees this card just fine. I put it in my brand new state of the art Dell 9380, and nothing. I am not sure if it is the card or the laptop. I tested the SD slot in my 9380 with the card from my Fire tablet, and it sees that just fine, so the SD reader is working. I even tried formatting the offending card in NTFS, still nothing in the 9380. The 9380 has the exfat utils installed, so I figured it was not that, but tested formats anyway. I knocked off one start since I do not know who is at fault.