pl := make([]byte, size)
	for i := 0; i < nFolders; i++ {
		name := filepath.Join(base, bucket, fmt.Sprint(i), "0.txt")
		err := os.MkdirAll(filepath.Dir(name), os.ModePerm)
		if err != nil {
			t.Fatal(err)
		}
		for j := 0; j < nFiles; j++ {
			name := filepath.Join(base, bucket, fmt.Sprint(i), fmt.Sprint(j)+".txt")
			err = os.WriteFile(name, pl, os.ModePerm)
			if err != nil {