I can not see my usb drives on my Mac book air? What should I do?

Try removing them (physically). If you see a notice about 'improperly ejecting', then they're just not showing up on your Desktop, which can be fixed in your Finder Preferences.

If no notifications pop up, then try a restart, and then insert your drives again.

If that doesn't work, see if Disk Utility can find them. If it sees them, try the Repair function...it shouldn't do anything to any data on the drives.

albena96 Said:

"I can not see my usb drives on my Mac book air? What should I do?"

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Mount the Drive:

Open Disk Utility:

Use Spotlight Search: [Hold Down: command + Press: spacebar]. Type Disk Utility. Then press return

Using Disk Utility:

Then, using Disk Utility, see if the Flash Drive is seen. If it is, then see if you need to click the “Mount’ button for it. Try rebooting once more. If of no success, then click unmount button, and then the mount button. Try rebooting once more.

What model MBA and what drive? Are you using an adapter? Have you tested on another Mac?