64gb usb, 17gb usable?

Don't know the exact place to post but, I have a 64gb lexar USB, and I made the USB a bit table USB drive for Linux, but then I got tired of it, formatted it, and it only let's me use around 17gb. I don't get it. Can anyone help me retrieve the 64gb of available space? 

You need to erase the partition table by the sounds of things and re-format the drive.

Go into Disk management or Diskpart (windows) or Gparted (or similar in Linux)

How to Access Disk Management in Windows 7

Wiping a disk using disk management or diskpart

Wow thanks for your very quick response! I shall try that soon because it sounds like it will work. Many thanks! :D