My MacBook is not recognizing USB drives, but it recognizes my iPhone.  Can someone assist me?  Thank you.

I am trying to get my mac book to recognize the thumb drive.  When I go into Disk Utilities it does not show up there either.  I have no problem syncing my iPhone to it so I do not think the USB drives are bad.  Can someone help me out?  Thanks!

I am getting the same issue with my MacBook Pro. If I go for a long peroid of time without restarting it starts to 'forget' USB sockets. First one stopped wortking and then the other. I restarted and they both beagan working fine again. Try giving that a go - I know it's an obvious option but it worked for me.
Otherwise check the file system on the thumb drive - is it Mac compatible? FAT 32 for example? Does it show up on other computers? 

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