Thumb Drive write protected after plugging into MacBook Pro

So I recently plugged my 64GB thumb drive into my MacBook Pro to transfer music from my old mac to my new one. Although as soon as I plugged into the MacBook Pro, it write protected it rendering it useless as I do not wish to use it as a storage drive for 60 songs! It is not even 1/2 full and because I plugged it into a MacBook Pro I can't use it anymore!? It is formatted to MS-FAT, and previously I had plugged it into my 09 MacBook with no problems! Please help me Make it a read and write again!!! The thumb drive is only a week old!!! There are no virus' as I have had the music on my Mac for 5 years and it has all come from the iTunes store!!!

Choose Utilities from the Finder’s Go menu, open the Disk Utility, and try running the Repair Disk command on it. If that command’s not available or doesn’t work, copy your files off and try getting a replacement.
(121968)

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Thanks again for your help Rod!
One of the first things I tried was different combinations of devices to see if it may have been the device just not powering up. The main device I use is an official Apple wired keyboard, because at home I connect my MBP to my monitor and use a separate keyboard and mouse. I have tried other devices too with the same result, they only work when the dock is connected. I have tried connecting my iPhone via USB cable, i have a 16GB SanDisk Cruzer flash drive, which only lights up if the dock is connected, and I have a 4 port USB hub with a power LED on it, which again only lights up when the dock is connected.
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I just want to say thanks again Rod, it's very kind of you to spend your time trying to help me, and it is really appreciated!
I'm going to contact Apple support shortly and see if they can offer a solution, or see if I can send it in for repair, which I am reluctant to do seeing as it's my only computer
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