I recently had a very strange situation. Somebody had an USB flash drive that was recognized by his computer but he couldn’t access it. I tried the flash drive on my laptop and worked like a charm. Tried back on the desktop PC and still not work.
Then I googled and found a very interesting post here, which looks very dummy but it’s true. This is the solution:

“Turning the PC off doesn’t really turn it off as the motherboard is still powered. So I pulled out the power cord, waited 30 seconds and put it back in. Et Voila! USBs all working again.

My theory is that the USB driver has an internal microprocessor and it needed a reboot. I wonder how many PCs get taken to the repair shop with this problem, are unknowingly ‘fixed’ when the power cord is unplugged, and the repair guy gets all the credit for fixing the problem without having to do anything!”

As a conclusion, you can try unplugging the computer for 30 seconds and try again. If you have a laptop, you can remove the battery.
It worked for me.

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