// with mode 0o777 mkdir honors system umask.
	mkdirAll(pathutil.Dir(filePath), 0o777, s.drivePath) // don't need to fail here

	w, err := s.openFileDirect(filePath, os.O_CREATE|os.O_WRONLY|os.O_EXCL)
	if err != nil {
		return err
	}
	_, err = w.Write(alignedBuf)
	w.Close()
	if err != nil {
		if isSysErrInvalidArg(err) {
			err = errUnsupportedDisk
		}
	}
	return err
}

		t.Fatal(err)
	}

	// 4) Streaming bitrot check on corrupted file
	filePath := pathJoin(storage.String(), volName, fileName)
	f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0o644)
	if err != nil {
		t.Fatal(err)
	}
	// Replace first 256 with 'a'.
	if _, err := f.WriteString(strings.Repeat("a", 256)); err != nil {
		t.Fatal(err)
	}
	f.Close()

			extractedFilePath := filepath.Join(targetDir, file.Name)
			if file.FileInfo().IsDir() {
				return os.MkdirAll(extractedFilePath, file.Mode())
			}
			outputFile, err := os.OpenFile(extractedFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
			if err != nil {
				return err
			}
			defer outputFile.Close()
			_, err = io.Copy(outputFile, zippedFile)
			return err
		}()
		if err != nil {