private fsMegaImage CreateDisk()
        {
            var disk = new AtrDiskImage();

            disk.CreateImage(WORKDIR + "testdisk.atr", 8192, 128);
            disk.Mount(WORKDIR + "testdisk.atr", 128);

            var fs = new fsMegaImage(disk);
            fs.Format(false);
            return fs;
        }
        private fsDos20 CreateDisk()
        {
            var disk = new AtrDiskImage();

            disk.CreateImage(WORKDIR + "testdisk.atr", 720, 128);
            disk.Mount(WORKDIR + "testdisk.atr", 128);
            disk.Unmount();
            var fs = new fsDos20(disk);
            fs.Format(false);
            return fs;
        }