title: Linux command to list file systems available for mounting?
body: <p>What terminal command will return data that includes the file systems that are currently available for mounting on my system?</p>
  
  <p>Specifically, I am using Ubuntu 15.04, though I would prefer an answer that is valid for all *nix users.</p>
  
  <p>NOTES: 
  I don't want to know what <em>IS</em> mounted, I want to know what is available.
  I don't want to check the type of file system (ext2, ext4, ntsf, etc.), I want to know which file systems are available to be mounted (sda2, fd1, etc.).</p>