Thank you for the reply.
Yes, I did wait until the end of the scan. It started at 1.7x and ended at 1.7x. I noticed the max was around 70%, 3.2x.
When I scanned the same disc on IHAS624B, it started at 4x right away and also ended with 4x. Also the result came out much better and the duration of the whole scan was much shorter.
Any chance there is something wrong with my drive? I burned a disc and tested it with IHAS624 and the quality was very good.
This is what kprobe showed after the end with my IHAS124-19C.