using System;
using System.IO;

namespace zeroes
{
    class zeroes
    {
        static void Main(string[] args)
        {
            String filename = "_ZEROES.BIN";
            String drive = Directory.GetCurrentDirectory().Substring(0, 1);

            byte[] zeros = new byte[10 * 1024 * 1024];
            Array.Clear(zeros, 0, zeros.Length);

            FileStream file = new FileStream(
                filename, FileMode.OpenOrCreate, FileAccess.Write,
                FileShare.None, zeros.Length, FileOptions.WriteThrough);

            while (new DriveInfo(drive).AvailableFreeSpace > zeros.Length)
                file.Write(zeros, 0, zeros.Length);

            file.Close();
            File.Delete(filename);
        }
    }
}