using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    public class DiskIsNotEnoughFreeSpace : IOException
    {
        public DiskIsNotEnoughFreeSpace(string msg)
            : base(msg)
        {

        }
    }

    public class FileStreamEx : FileStream
    {
        

        public FileStreamEx(string path, FileMode mode, FileAccess access) : base(path, mode,access)
        {

        }

        public override void WriteByte(byte value)
        {
            // ドライブ名取得
            DriveInfo driveinfo = new DriveInfo(Path.GetPathRoot(this.Name));

            if (driveinfo.AvailableFreeSpace < 1)
                throw new DiskIsNotEnoughFreeSpace("HDDに空きがありません");

            base.WriteByte(value);
            // 残り3kbちょっきしでIOException
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            using (var fs2 = new FileStream(@"R:\test.temp", FileMode.Create))
            {
                fs2.SetLength(9275179686);


                FileStreamEx fs = new FileStreamEx(@"R:\test.byte", FileMode.Append, FileAccess.Write);

                while (true)
                {

                    fs.WriteByte(64);
                }
            }
            
        }
    }
}