// Set at beginning:
using System.Diagnostics;
using System.Collections.Generic;

// --------------

Process p = new Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.CreateNoWindow = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
p.StartInfo.FileName = "fsutil";
p.StartInfo.Arguments = "volume diskfree c:";

string salida = "";
string[] separator = new string[] {"\n"};
string[] output;

p.Start();
salida = p.StandardOutput.ReadToEnd();
p.WaitForExit();

output = salida.Split(separator, StringSplitOptions.None);
string total = output[1].Substring(41);
total = total.Substring(1, total.Length - 1);
string libre = output[2].Substring(41);
libre = libre.Substring(1, libre.Length - 1);

long ttot = Int64.Parse(total);
long tlib = Int64.Parse(libre);
long tfin = tlib / 1024 / 1024;
long tmeg = tfin % 1024;
tfin = tfin / 1024;

BFS.Speech.TextToSpeech(tfin.ToString() + " gigas y " + tmeg.ToString() + " megas");