local root = fs.list("/")
local drives = {}

for i=1, #root do
  local path = root[i]
  drives[fs.getDrive(path)] = fs.getFreeSpace(path)
end

print("Filesystem   Available")
for drive, bytes in pairs(drives) do
  print(drive, string.rep(" ", math.max(11 - #drive, 1)), bytes)
end