If not, the port might have to be replaced (which means a trip to your local PC repair shop). If your USB port is not working you could try blowing canned air into the port to see if that solves the problem. How to Fix USB Flash Drive not Showing up on Mac → Right-click the Unallocated portion of the device in the bottom pane.If your USB device isn’t showing up, you can fix this by inserting the USB device and creating a new volume on the device. Click the drop-down associated with Assign the following Drive letter.Press the Windows key + X key combination.To remedy this, insert the SD/USB device and change the drive letter by following these steps:
Your USB drive might be unreadable, because of the assigned letter drive. How to Recover Files from a RAW Partition →
When a flash device is found as RAW, it means, for whatever reason, the file system is damaged. Have you ever inserted a USB stick into your PC or laptop, only to find it unreadable by your system? At that point, you might be wondering how to recover information from a broken flash drive? Before we answer that question, you should know there are a lot of reasons why this can happen, but there’s generally one term applied to that unfortunate state your card has fallen prey to - RAW.