Flash drive size shrunk?

blackhawks2013

Honorable
Sep 8, 2013
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10,680
I used to have an old 4 gb usb stick used to hold drivers. I wasn't paying attention, but somehow, it deleted all files on the stick, and change the total file size to 25.9 MB. Luckily I have all the files saved on Google Drive, but I can't put them back due to the small size.

Any idea's on how this hapened, and is there anyway to get it back?