For software or driver issues, you can scan and repair your flash drive using your computer's built-in repair utility. If your drive isn't working because of an improper formatting or corrupted data, you can reformat your drive—but keep in mind that reformatting your USB flash drive will erase all files on it. Finally, if the flash drive won't work because of physical damage, you should take it into a tech department or data recovery professional; if that's not possible, you may be able to fix it yourself by soldering the broken USB drive's circuitry to a working USB cable. However, attempting repairs yourself is not recommended as there is a high risk of destroying the flash drive.
steps
1-Plug your flash drive into your computer. The flash drive should fit into one of the rectangular ports on your Mac's housing. If you're encountering errors on your flash drive or it won't display its contents, you may need to update its drivers or software using your computer's repair feature.
2-Open Finder. This resembles a blue face. You'll find it in the Dock.
3-Click the Go menu item. It's in the upper-left side of the screen.
4-Click Utilities. It's a folder near the bottom of the Go drop-down menu.
5-Double-click Disk Utility. It resembles a stethoscope on top of a hard drive icon.
6-Select your flash drive. This is the indented icon below the "External" heading.
7-Click First Aid. It's at the top of the Disk Utility window.
8-Click Run when prompted. It's the blue button on the pop-up window.
9-Wait for the scan to complete. Disk Utility will repair any software- or driver-related problems.
10-Click Done when prompted. If your flash drive's problems were driver- or software-based, it should work now.
11-Click eject. When you are finished using a flash drive on a Mac, always eject it before removing it. This prevents damage from being done to your flash drive. To eject it, click the eject icon next to the drive in the Finder, or click and drag it to the Eject icon in the Dock when on your desktop.
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