Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to know that you are facing problem with usb flash drive not being recognised.
let me know on which device you are trying to access the usb stick?
I am trying to answer your question which you have posted with us let me know when you are ready i can assist you.
Try to connect the usb stick on to a different usb port and let me know the make and model of the computer.
its a desktop or a laptop?