It's actually transfer rate test, not "scan". So what I can say,
No problems if you got to the end without errors.
It is not full 4.38GB, so you do not know the max speed on this.
You forgot to mention the brand and media ID and certified speed, what burner it was burnt on and at what speed.
If you run this test again on very quiet system, see if the end part looks smooth, and that CPU% is not very high.
Without real scan it's hard to tell more.