While the reasons could be many, but first, it is essential that you rightly assess the situation. But when you plug it in, your Mac doesn't recognize USB. You might have come across a situation where your friend has sent you photos on a Flash drive. Part 1: Why Mac doesn't recognize the USB drive Part 4: How to Prevent Flash Drive not showing up on Mac.Part 3: How to Access Flash Drive data after detecting USB.Part 2: How to fix Mac not recognizing USB Device.
