I for some reason can't find anything on google that tells me how to figure out what my drive has been formatted to. Any search for my question gives me results for "how to format" and not "what my format is." By format I mean NTFS, FAT32, HFS+, etc.
Use the command, as root or sudo -
the usb driver is probably labled /dev/sdb like the below -
Or for a graphical version go to
Select the hard disk you are interested in, and all sorts of wonderful information will be visible.