My usb flash drive can't read in my macbook air running mavericks 10.9.4 os x

Good day to all. Im just a new user of macbook air. My macbook don't read the usb neither it's in the disk utility. Can somebody help me?

Hi Ranz Villa,
Welcome to the Apple Support Communities!
I know it can be very frustrating when your computer is not working as you would expect. In your situation I recommend reading over the attached article, specifically the Top troubleshooting tips section. This will help you isolate the issue.
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151
Have a great day,
Joe

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