i have a solution for you, plug in the usb head on to my computer type ? or / into windows search top left all the files in the usb will be visible copy it to your pc and save a back up.this always works for me.
I'm guessing it's a 8GB one, but the useful space is somewhat less, hence OP is calling it a 7GB.
It can be a couple of things, OP. There are flash drives with ready only switch, maybe you mistakenly switched it. Or the drive can be corrupted. You can try formatting it and see if it helps.
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