Hello, I have a usb Key SanDisk Extreme Pro USB 3.0 128 Gb which is not available on my pc when I plug it. I haved plug it on various pcs and even on mac with the same issue. Tt’s a pity because it was a wonderful storage tool. Very fast.
in that case the drive seems to be defective and needs to be replaced.
here you can open an online rma request to replace it with sandisk direct